diff --git a/.ember-cli b/.ember-cli
index acc2a0e0d..a37e45fab 100644
--- a/.ember-cli
+++ b/.ember-cli
@@ -3,7 +3,7 @@
     Setting `isTypeScriptProject` to true will force the blueprint generators to generate TypeScript
     rather than JavaScript by default, when a TypeScript version of a given blueprint is available.
   */
-  "isTypeScriptProject": false,
+  "isTypeScriptProject": true,
 
   /**
     Setting `componentAuthoringFormat` to "strict" will force the blueprint generators to generate GJS
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 4c4eb8f5c..1b1c5690d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -31,7 +31,7 @@ Roughly every 4 minor versions, and every final minor version before the next ma
 
 Once a new LTS has been announced, please update the [LTS Channel page](https://emberjs.com/releases/lts/) by following these steps:
 
-- Update `app/utils/releases/lts.js` to show currently supported LTS versions.
+- Update `app/utils/releases/lts.ts` to show currently supported LTS versions.
 - Update `data/project/ember/lts.md` to show the most recent LTS version.
 
 You can find out _when_ a release was promoted to LTS from the [changelog for Ember.js](https://github.com/emberjs/ember.js/blob/master/CHANGELOG.md). The LTS promotion date is the release date of the next minor version. For example, Ember 3.16 was promoted to LTS on [March 4, 2020](https://github.com/emberjs/ember.js/blob/master/CHANGELOG.md#v3170-march-4-2020) because that's the release date of v3.17.0.
diff --git a/app/adapters/application.js b/app/adapters/application.ts
similarity index 64%
rename from app/adapters/application.js
rename to app/adapters/application.ts
index b20584305..9e13c1880 100644
--- a/app/adapters/application.js
+++ b/app/adapters/application.ts
@@ -1,21 +1,23 @@
 import JSONAPIAdapter from '@ember-data/adapter/json-api';
 
 export default class ApplicationAdapter extends JSONAPIAdapter {
-  shouldBackgroundReloadAll() {
+  shouldBackgroundReloadAll(): boolean {
     return false;
   }
 
-  shouldBackgroundReloadRecord() {
+  shouldBackgroundReloadRecord(): boolean {
     return false;
   }
 
-  urlForFindAll(modelName) {
+  urlForFindAll(modelName: string): string {
     const path = this.pathForType(modelName);
+
     return `/data/${path}/all.json`;
   }
 
-  urlForFindRecord(id, modelName) {
+  urlForFindRecord(id: string, modelName: string): string {
     const path = this.pathForType(modelName);
+
     return `/data/${path}/${id}.json`;
   }
 }
diff --git a/app/app.js b/app/app.ts
similarity index 100%
rename from app/app.js
rename to app/app.ts
diff --git a/app/config/environment.ts b/app/config/environment.ts
new file mode 100644
index 000000000..bc80f9a2d
--- /dev/null
+++ b/app/config/environment.ts
@@ -0,0 +1,33 @@
+import { assert } from '@ember/debug';
+import loadConfigFromMeta from '@embroider/config-meta-loader';
+
+const config = loadConfigFromMeta('ember-website') as unknown;
+
+assert(
+  'config is not an object',
+  typeof config === 'object' && config !== null,
+);
+assert(
+  'modulePrefix was not detected on your config',
+  'modulePrefix' in config && typeof config.modulePrefix === 'string',
+);
+assert(
+  'locationType was not detected on your config',
+  'locationType' in config && typeof config.locationType === 'string',
+);
+assert(
+  'rootURL was not detected on your config',
+  'rootURL' in config && typeof config.rootURL === 'string',
+);
+assert(
+  'APP was not detected on your config',
+  'APP' in config && typeof config.APP === 'object',
+);
+
+export default config as {
+  APP: Record<string, unknown>;
+  locationType: string;
+  modulePrefix: string;
+  podModulePrefix?: string;
+  rootURL: string;
+} & Record<string, unknown>;
diff --git a/app/helpers/add-weeks.js b/app/helpers/add-weeks.js
deleted file mode 100644
index dc195abde..000000000
--- a/app/helpers/add-weeks.js
+++ /dev/null
@@ -1,6 +0,0 @@
-import { helper } from '@ember/component/helper';
-import dayjs from 'dayjs';
-
-export default helper(function addWeeks([initialDate, numWeeks = 0]) {
-  return dayjs(initialDate).add(numWeeks, 'week');
-});
diff --git a/app/helpers/add-weeks.ts b/app/helpers/add-weeks.ts
new file mode 100644
index 000000000..aa7a096dc
--- /dev/null
+++ b/app/helpers/add-weeks.ts
@@ -0,0 +1,18 @@
+import { helper } from '@ember/component/helper';
+import dayjs from 'dayjs';
+import type { Dayjs } from 'dayjs';
+
+interface AddWeeksSignature {
+  Args: {
+    Named: {};
+    Positional: [initialDate: string | Date | Dayjs, numWeeks?: number];
+  };
+  Return: Dayjs;
+}
+
+export default helper<AddWeeksSignature>(function addWeeks([
+  initialDate,
+  numWeeks = 0,
+]) {
+  return dayjs(initialDate).add(numWeeks, 'week');
+});
diff --git a/app/helpers/format-date-time.js b/app/helpers/format-date-time.js
deleted file mode 100644
index 7ae0842d6..000000000
--- a/app/helpers/format-date-time.js
+++ /dev/null
@@ -1,10 +0,0 @@
-import { helper } from '@ember/component/helper';
-import dayjs from 'dayjs';
-
-export default helper(function formatDateTime([date, format = 'MMM D']) {
-  if (!date) {
-    return 'Unknown date';
-  }
-
-  return dayjs(date).format(format);
-});
diff --git a/app/helpers/format-date-time.ts b/app/helpers/format-date-time.ts
new file mode 100644
index 000000000..351e28608
--- /dev/null
+++ b/app/helpers/format-date-time.ts
@@ -0,0 +1,22 @@
+import { helper } from '@ember/component/helper';
+import dayjs from 'dayjs';
+import type { Dayjs } from 'dayjs';
+
+interface FormatDateTimeSignature {
+  Args: {
+    Named: {};
+    Positional: [date?: string | Date | Dayjs, format?: string];
+  };
+  Return: string;
+}
+
+export default helper<FormatDateTimeSignature>(function formatDateTime([
+  date,
+  format = 'MMM D',
+]) {
+  if (!date) {
+    return 'Unknown date';
+  }
+
+  return dayjs(date).format(format);
+});
diff --git a/app/helpers/printf.js b/app/helpers/printf.js
deleted file mode 100644
index c16f5a6d2..000000000
--- a/app/helpers/printf.js
+++ /dev/null
@@ -1,5 +0,0 @@
-import { helper } from '@ember/component/helper';
-
-export default helper(function printf([string = '', replacement = '']) {
-  return string.replace(/%s/g, replacement);
-});
diff --git a/app/helpers/printf.ts b/app/helpers/printf.ts
new file mode 100644
index 000000000..44089c0f3
--- /dev/null
+++ b/app/helpers/printf.ts
@@ -0,0 +1,16 @@
+import { helper } from '@ember/component/helper';
+
+interface PrintFSignature {
+  Args: {
+    Named: {};
+    Positional: [value?: string, replacement?: string];
+  };
+  Return: string;
+}
+
+export default helper<PrintFSignature>(function printf([
+  value = '',
+  replacement = '',
+]) {
+  return value.replace(/%s/g, replacement);
+});
diff --git a/app/helpers/qp.js b/app/helpers/qp.js
deleted file mode 100644
index 9940abbcf..000000000
--- a/app/helpers/qp.js
+++ /dev/null
@@ -1,10 +0,0 @@
-import Helper from '@ember/component/helper';
-import { service } from '@ember/service';
-
-export default class QP extends Helper {
-  @service router;
-
-  compute([qp]) {
-    return this.router.currentRoute?.queryParams?.[qp];
-  }
-}
diff --git a/app/helpers/qp.ts b/app/helpers/qp.ts
new file mode 100644
index 000000000..27c8f5e11
--- /dev/null
+++ b/app/helpers/qp.ts
@@ -0,0 +1,21 @@
+import Helper from '@ember/component/helper';
+import { type Registry as Services, service } from '@ember/service';
+
+interface QpSignature {
+  Args: {
+    Named: {};
+    Positional: [key: string];
+  };
+  Return: string | undefined;
+}
+
+export default class QpHelper extends Helper<QpSignature> {
+  @service declare router: Services['router'];
+
+  compute([key]: QpSignature['Args']['Positional']): QpSignature['Return'] {
+    const queryParams = this.router.currentRoute?.queryParams as
+      Record<string, string> | undefined;
+
+    return queryParams?.[key];
+  }
+}
diff --git a/app/models/initiative-sponsor.js b/app/models/initiative-sponsor.js
deleted file mode 100644
index 4c0dd8a9b..000000000
--- a/app/models/initiative-sponsor.js
+++ /dev/null
@@ -1,10 +0,0 @@
-import Model, { attr } from '@ember-data/model';
-
-export default class SponsorModel extends Model {
-  @attr content;
-  @attr image;
-  @attr name;
-  @attr url;
-  @attr('number') tier;
-  @attr('number') order;
-}
diff --git a/app/models/initiative-sponsor.ts b/app/models/initiative-sponsor.ts
new file mode 100644
index 000000000..0a99898ed
--- /dev/null
+++ b/app/models/initiative-sponsor.ts
@@ -0,0 +1,13 @@
+import Model, { attr } from '@ember-data/model';
+import type { Type } from '@warp-drive/core-types/symbols';
+
+export default class InitiativeSponsorModel extends Model {
+  declare [Type]: 'initiative-sponsor';
+
+  @attr declare content: string;
+  @attr declare image: string;
+  @attr declare name: string;
+  @attr declare url: string;
+  @attr('number') declare tier: number;
+  @attr('number') declare order: number;
+}
diff --git a/app/models/meetup.js b/app/models/meetup.js
deleted file mode 100644
index 9d635f94c..000000000
--- a/app/models/meetup.js
+++ /dev/null
@@ -1,10 +0,0 @@
-import Model, { attr } from '@ember-data/model';
-
-export default class MeetupModel extends Model {
-  @attr('string') area;
-  @attr('number') lat;
-  @attr('number') lng;
-  @attr('string') location;
-  @attr organizers;
-  @attr('string') url;
-}
diff --git a/app/models/meetup.ts b/app/models/meetup.ts
new file mode 100644
index 000000000..d4170eaba
--- /dev/null
+++ b/app/models/meetup.ts
@@ -0,0 +1,16 @@
+import Model, { attr } from '@ember-data/model';
+import type { Type } from '@warp-drive/core-types/symbols';
+
+export default class MeetupModel extends Model {
+  declare [Type]: 'meetup';
+
+  @attr declare area: string;
+  @attr('number') declare lat: number;
+  @attr('number') declare lng: number;
+  @attr declare location: string;
+  @attr declare organizers: {
+    organizer: string;
+    profileImage?: string;
+  }[];
+  @attr declare url: string;
+}
diff --git a/app/models/project.js b/app/models/project.js
deleted file mode 100644
index 5a1cc247d..000000000
--- a/app/models/project.js
+++ /dev/null
@@ -1,23 +0,0 @@
-import Model, { attr } from '@ember-data/model';
-
-export default class ProjectModel extends Model {
-  @attr('string') baseFileName;
-  @attr('string') changelogPath;
-  @attr('string') channel;
-  @attr('string') content;
-  @attr('date') date;
-  @attr('string') debugFileName;
-  @attr filter;
-  @attr ignoreFiles;
-  @attr('string') lastRelease;
-  @attr('string') name;
-  @attr('string') repo;
-
-  get lastReleaseChangelogUrl() {
-    if (this.channel === 'canary' || !this.changelogPath) {
-      return '';
-    }
-
-    return `https://github.com/${this.repo}/blob/v${this.lastRelease}/${this.changelogPath}`;
-  }
-}
diff --git a/app/models/project.ts b/app/models/project.ts
new file mode 100644
index 000000000..503baa1e5
--- /dev/null
+++ b/app/models/project.ts
@@ -0,0 +1,26 @@
+import Model, { attr } from '@ember-data/model';
+import type { Type } from '@warp-drive/core-types/symbols';
+
+export default class ProjectModel extends Model {
+  declare [Type]: 'project';
+
+  @attr declare baseFileName: string;
+  @attr declare changelogPath: string;
+  @attr declare channel: string;
+  @attr declare content: string;
+  @attr('date') declare date: Date;
+  @attr declare debugFileName: string;
+  @attr declare filter: string;
+  @attr declare ignoreFiles: string[];
+  @attr declare lastRelease: string;
+  @attr declare name: string;
+  @attr declare repo: string;
+
+  get lastReleaseChangelogUrl(): string {
+    if (this.channel === 'canary' || !this.changelogPath) {
+      return '';
+    }
+
+    return `https://github.com/${this.repo}/blob/v${this.lastRelease}/${this.changelogPath}`;
+  }
+}
diff --git a/app/models/showcase.js b/app/models/showcase.js
deleted file mode 100644
index 4da3f09ef..000000000
--- a/app/models/showcase.js
+++ /dev/null
@@ -1,10 +0,0 @@
-import Model, { attr } from '@ember-data/model';
-
-export default class ShowcaseModel extends Model {
-  @attr('string') demo;
-  @attr features;
-  @attr('string') html;
-  @attr image;
-  @attr('string') name;
-  @attr('string') repository;
-}
diff --git a/app/models/showcase.ts b/app/models/showcase.ts
new file mode 100644
index 000000000..b6388598f
--- /dev/null
+++ b/app/models/showcase.ts
@@ -0,0 +1,15 @@
+import Model, { attr } from '@ember-data/model';
+import type { Type } from '@warp-drive/core-types/symbols';
+
+export default class ShowcaseModel extends Model {
+  declare [Type]: 'showcase';
+
+  @attr declare demo: string;
+  @attr declare features: string;
+  @attr declare html: string;
+  @attr declare image: {
+    src: string;
+  };
+  @attr declare name: string;
+  @attr declare repository: string;
+}
diff --git a/app/models/sponsor.js b/app/models/sponsor.js
deleted file mode 100644
index fb5018744..000000000
--- a/app/models/sponsor.js
+++ /dev/null
@@ -1,30 +0,0 @@
-import Model, { attr } from '@ember-data/model';
-
-export default class SponsorModel extends Model {
-  @attr content;
-  @attr('date') end;
-  @attr image;
-  @attr name;
-  @attr('date') start;
-  @attr url;
-  @attr('number') order;
-
-  get term() {
-    let startYear = this.start.getFullYear();
-    let endYear;
-
-    if (this.end) {
-      endYear = this.end.getFullYear();
-    }
-
-    if (startYear === endYear) {
-      return `${startYear}`;
-    }
-
-    if (!endYear) {
-      endYear = 'present';
-    }
-
-    return `${startYear} - ${endYear}`;
-  }
-}
diff --git a/app/models/sponsor.ts b/app/models/sponsor.ts
new file mode 100644
index 000000000..ce3fdf271
--- /dev/null
+++ b/app/models/sponsor.ts
@@ -0,0 +1,33 @@
+import Model, { attr } from '@ember-data/model';
+import type { Type } from '@warp-drive/core-types/symbols';
+
+export default class SponsorModel extends Model {
+  declare [Type]: 'sponsor';
+
+  @attr declare content: string;
+  @attr('date') declare end: Date;
+  @attr declare image: string;
+  @attr declare name: string;
+  @attr('date') declare start: Date;
+  @attr declare url: string;
+  @attr('number') declare order: number;
+
+  get term(): string {
+    const startYear = this.start.getFullYear();
+    let endYear;
+
+    if (this.end) {
+      endYear = this.end.getFullYear();
+    }
+
+    if (startYear === endYear) {
+      return `${startYear}`;
+    }
+
+    if (!endYear) {
+      endYear = 'present';
+    }
+
+    return `${startYear} - ${endYear}`;
+  }
+}
diff --git a/app/models/team-member.js b/app/models/team-member.js
deleted file mode 100644
index cf75670f9..000000000
--- a/app/models/team-member.js
+++ /dev/null
@@ -1,15 +0,0 @@
-import Model, { attr } from '@ember-data/model';
-
-export default class TeamMemberModel extends Model {
-  @attr('date') added;
-  @attr bluesky;
-  @attr first;
-  @attr github;
-  @attr image;
-  @attr last;
-  @attr mastodon;
-  @attr name;
-  @attr social;
-  @attr teams;
-  @attr twitter;
-}
diff --git a/app/models/team-member.ts b/app/models/team-member.ts
new file mode 100644
index 000000000..0a481d7ce
--- /dev/null
+++ b/app/models/team-member.ts
@@ -0,0 +1,18 @@
+import Model, { attr } from '@ember-data/model';
+import type { Type } from '@warp-drive/core-types/symbols';
+
+export default class TeamMemberModel extends Model {
+  declare [Type]: 'team-member';
+
+  @attr('date') declare added: Date;
+  @attr declare bluesky?: string;
+  @attr declare first: string;
+  @attr declare github?: string;
+  @attr declare image: string;
+  @attr declare last: string;
+  @attr declare mastodon?: string;
+  @attr declare name: string;
+  @attr declare social?: string;
+  @attr declare teams: string[];
+  @attr declare twitter?: string;
+}
diff --git a/app/models/tomster.js b/app/models/tomster.js
deleted file mode 100644
index c45ae103b..000000000
--- a/app/models/tomster.js
+++ /dev/null
@@ -1,9 +0,0 @@
-import Model, { attr } from '@ember-data/model';
-
-export default class TomsterModel extends Model {
-  @attr('date') date;
-  @attr('string') image;
-  @attr tags;
-  @attr('string') title;
-  @attr('string') url;
-}
diff --git a/app/models/tomster.ts b/app/models/tomster.ts
new file mode 100644
index 000000000..435b5779f
--- /dev/null
+++ b/app/models/tomster.ts
@@ -0,0 +1,12 @@
+import Model, { attr } from '@ember-data/model';
+import type { Type } from '@warp-drive/core-types/symbols';
+
+export default class TomsterModel extends Model {
+  declare [Type]: 'tomster';
+
+  @attr('date') declare date: Date;
+  @attr declare image: string;
+  @attr declare tags: string[];
+  @attr declare title: string;
+  @attr declare url: string;
+}
diff --git a/app/models/user.js b/app/models/user.js
deleted file mode 100644
index c089bc41d..000000000
--- a/app/models/user.js
+++ /dev/null
@@ -1,11 +0,0 @@
-import Model, { attr } from '@ember-data/model';
-
-export default class UserModel extends Model {
-  @attr('date') added;
-  @attr('string') content;
-  @attr('boolean') featured;
-  @attr('string') image;
-  @attr('boolean') inactive;
-  @attr('string') name;
-  @attr('string') url;
-}
diff --git a/app/models/user.ts b/app/models/user.ts
new file mode 100644
index 000000000..1bae9e4ce
--- /dev/null
+++ b/app/models/user.ts
@@ -0,0 +1,14 @@
+import Model, { attr } from '@ember-data/model';
+import type { Type } from '@warp-drive/core-types/symbols';
+
+export default class UserModel extends Model {
+  declare [Type]: 'user';
+
+  @attr('date') declare added: Date;
+  @attr declare content: string;
+  @attr('boolean') declare featured: boolean;
+  @attr declare image: string;
+  @attr('boolean') declare inactive: boolean;
+  @attr declare name: string;
+  @attr declare url: string;
+}
diff --git a/app/modifiers/draw-chart.js b/app/modifiers/draw-chart.ts
similarity index 59%
rename from app/modifiers/draw-chart.js
rename to app/modifiers/draw-chart.ts
index 07a0bd691..0463f7306 100644
--- a/app/modifiers/draw-chart.js
+++ b/app/modifiers/draw-chart.ts
@@ -1,7 +1,23 @@
 import { registerDestructor } from '@ember/destroyable';
 import merge from 'deepmerge';
+import type { PositionalArgs } from 'ember-modifier';
 import Modifier from 'ember-modifier';
 
+// eslint-disable-next-line @typescript-eslint/consistent-type-imports
+type Highcharts = typeof import('highcharts');
+
+type Chart = {
+  highchartsOptions: Highcharts.ChartOptions;
+};
+
+interface DrawChartSignature {
+  Args: {
+    Named: {};
+    Positional: [chart?: Chart];
+  };
+  Element: HTMLElement;
+}
+
 const optionsForAllCharts = {
   credits: {
     enabled: false,
@@ -18,10 +34,15 @@ const optionsForAllCharts = {
   },
 };
 
-export default class DrawChartModifier extends Modifier {
-  highcharts;
+export default class DrawChartModifier extends Modifier<DrawChartSignature> {
+  declare chartInstance: Highcharts.Chart;
+  declare highcharts: Highcharts;
 
-  async modify(element, [chart]) {
+  // eslint-disable-next-line @typescript-eslint/no-misused-promises
+  async modify(
+    element: HTMLElement,
+    [chart]: PositionalArgs<DrawChartSignature>,
+  ): Promise<void> {
     if (!chart) {
       return;
     }
@@ -33,7 +54,7 @@ export default class DrawChartModifier extends Modifier {
     registerDestructor(this, this.destroyChart.bind(this));
   }
 
-  async initializeHighcharts() {
+  async initializeHighcharts(): Promise<void> {
     if (this.highcharts) {
       return;
     }
@@ -48,7 +69,8 @@ export default class DrawChartModifier extends Modifier {
     this.highcharts.setOptions(optionsForAllCharts);
   }
 
-  drawChart({ chart, element }) {
+  drawChart({ chart, element }: { chart: Chart; element: HTMLElement }): void {
+    // @ts-expect-error: Incorrect type
     element.removeAttribute('data-render-state', 'settled');
 
     const chartOptions = merge(
@@ -67,7 +89,7 @@ export default class DrawChartModifier extends Modifier {
     this.chartInstance = this.highcharts.chart(element, chartOptions);
   }
 
-  destroyChart() {
+  destroyChart(): void {
     this.chartInstance.destroy();
   }
 }
diff --git a/app/router.js b/app/router.ts
similarity index 100%
rename from app/router.js
rename to app/router.ts
diff --git a/app/serializers/application.js b/app/serializers/application.ts
similarity index 79%
rename from app/serializers/application.js
rename to app/serializers/application.ts
index eaffa3a0b..87d376aca 100644
--- a/app/serializers/application.js
+++ b/app/serializers/application.ts
@@ -1,7 +1,7 @@
 import JSONAPISerializer from '@ember-data/serializer/json-api';
 
 export default class ApplicationSerializer extends JSONAPISerializer {
-  keyForAttribute(key) {
+  keyForAttribute(key: string): string {
     return key;
   }
 }
diff --git a/app/services/head-data.js b/app/services/head-data.ts
similarity index 52%
rename from app/services/head-data.js
rename to app/services/head-data.ts
index de8ae86b1..95e2f46bc 100644
--- a/app/services/head-data.js
+++ b/app/services/head-data.ts
@@ -2,5 +2,11 @@ import Service from '@ember/service';
 import { tracked } from '@glimmer/tracking';
 
 export default class HeadDataService extends Service {
-  @tracked pageTitle;
+  @tracked pageTitle?: string;
+}
+
+declare module '@ember/service' {
+  interface Registry {
+    'head-data': HeadDataService;
+  }
 }
diff --git a/app/services/page-title.js b/app/services/page-title.ts
similarity index 64%
rename from app/services/page-title.js
rename to app/services/page-title.ts
index 9e2f2c2af..f087b0160 100644
--- a/app/services/page-title.js
+++ b/app/services/page-title.ts
@@ -8,13 +8,19 @@
 
   https://github.com/ember-cli/ember-page-title/issues/201#issuecomment-761081734
 */
-import { service } from '@ember/service';
+import { type Registry as Services, service } from '@ember/service';
 import EmberPageTitleService from 'ember-page-title/services/page-title';
 
 export default class PageTitleService extends EmberPageTitleService {
-  @service headData;
+  @service declare headData: Services['head-data'];
 
-  titleDidUpdate(pageTitle) {
+  titleDidUpdate(pageTitle: string): void {
     this.headData.pageTitle = pageTitle;
   }
 }
+
+declare module '@ember/service' {
+  interface Registry {
+    'page-title': PageTitleService;
+  }
+}
diff --git a/app/utils/format-url.js b/app/utils/format-url.ts
similarity index 79%
rename from app/utils/format-url.js
rename to app/utils/format-url.ts
index 374a8a1e6..09787d193 100644
--- a/app/utils/format-url.js
+++ b/app/utils/format-url.ts
@@ -1,4 +1,4 @@
-export function formatURL(url) {
+export function formatURL(url: string): string {
   if (url.includes('#')) {
     return url.replace(/([^/])#(.*)/, '$1/#$2');
   }
diff --git a/app/utils/highcharts/area-spline-chart.js b/app/utils/highcharts/area-spline-chart.ts
similarity index 67%
rename from app/utils/highcharts/area-spline-chart.js
rename to app/utils/highcharts/area-spline-chart.ts
index 043f80a25..2095f0852 100644
--- a/app/utils/highcharts/area-spline-chart.js
+++ b/app/utils/highcharts/area-spline-chart.ts
@@ -3,15 +3,34 @@
 */
 import { tracked } from '@glimmer/tracking';
 
+export type Chart = {
+  categories: string[];
+  subtitle?: string;
+  title: string;
+};
+
+export type RawData = {
+  color: string;
+  label: string;
+  values: number[];
+}[];
+
+type Series = {
+  color: string;
+  data: number[];
+  name: string;
+}[];
+
 export default class AreaSplineChart {
-  @tracked chart;
-  @tracked rawData;
+  @tracked chart: Chart;
+  @tracked rawData?: RawData;
 
-  constructor({ chart, rawData }) {
+  constructor({ chart, rawData }: { chart: Chart; rawData: RawData }) {
     this.chart = chart;
     this.rawData = rawData;
   }
 
+  // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
   get highchartsOptions() {
     const { chart, isLegendEnabled, series } = this;
 
@@ -55,19 +74,19 @@ export default class AreaSplineChart {
     };
   }
 
-  get isLegendEnabled() {
+  get isLegendEnabled(): boolean {
     const { series } = this;
 
     return series.length > 1;
   }
 
-  get series() {
+  get series(): Series {
     return createSeries(this.rawData);
   }
 }
 
-function createSeries(rawData = []) {
-  const data = [];
+function createSeries(rawData: RawData = []): Series {
+  const data: Series = [];
 
   rawData.forEach((datum) => {
     const { color, label, values } = datum;
diff --git a/app/utils/highcharts/horizontal-bar-chart.js b/app/utils/highcharts/horizontal-bar-chart.ts
similarity index 67%
rename from app/utils/highcharts/horizontal-bar-chart.js
rename to app/utils/highcharts/horizontal-bar-chart.ts
index b1470af1f..d0ff7335a 100644
--- a/app/utils/highcharts/horizontal-bar-chart.js
+++ b/app/utils/highcharts/horizontal-bar-chart.ts
@@ -3,15 +3,34 @@
 */
 import { tracked } from '@glimmer/tracking';
 
+export type Chart = {
+  categories: string[];
+  subtitle?: string;
+  title: string;
+};
+
+export type RawData = {
+  color: string;
+  label: string;
+  values: number[];
+}[];
+
+type Series = {
+  color: string;
+  data: number[];
+  name: string;
+}[];
+
 export default class HorizontalBarChart {
-  @tracked chart;
-  @tracked rawData;
+  @tracked chart: Chart;
+  @tracked rawData?: RawData;
 
-  constructor({ chart, rawData }) {
+  constructor({ chart, rawData }: { chart: Chart; rawData: RawData }) {
     this.chart = chart;
     this.rawData = rawData;
   }
 
+  // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
   get highchartsOptions() {
     const { chart, isLegendEnabled, series } = this;
 
@@ -56,19 +75,19 @@ export default class HorizontalBarChart {
     };
   }
 
-  get isLegendEnabled() {
+  get isLegendEnabled(): boolean {
     const { series } = this;
 
     return series.length > 1;
   }
 
-  get series() {
+  get series(): Series {
     return createSeries(this.rawData);
   }
 }
 
-function createSeries(rawData = []) {
-  const data = [];
+function createSeries(rawData: RawData = []): Series {
+  const data: Series = [];
 
   rawData.forEach((datum) => {
     const { color, label, values } = datum;
diff --git a/app/utils/highcharts/index.js b/app/utils/highcharts/index.ts
similarity index 100%
rename from app/utils/highcharts/index.js
rename to app/utils/highcharts/index.ts
diff --git a/app/utils/highcharts/pie-chart.js b/app/utils/highcharts/pie-chart.ts
similarity index 60%
rename from app/utils/highcharts/pie-chart.js
rename to app/utils/highcharts/pie-chart.ts
index 130e05f5c..210003c47 100644
--- a/app/utils/highcharts/pie-chart.js
+++ b/app/utils/highcharts/pie-chart.ts
@@ -3,15 +3,37 @@
 */
 import { tracked } from '@glimmer/tracking';
 
+export type Chart = {
+  subtitle?: string;
+  title: string;
+};
+
+export type RawData = {
+  color: string;
+  label: string;
+  value: number;
+}[];
+
+type Series = [
+  {
+    colors: string[];
+    data: {
+      name: string;
+      y: number;
+    }[];
+  },
+];
+
 export default class PieChart {
-  @tracked chart;
-  @tracked rawData;
+  @tracked chart: Chart;
+  @tracked rawData?: RawData;
 
-  constructor({ chart, rawData }) {
+  constructor({ chart, rawData }: { chart: Chart; rawData: RawData }) {
     this.chart = chart;
     this.rawData = rawData;
   }
 
+  // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
   get highchartsOptions() {
     const { chart, series } = this;
 
@@ -37,14 +59,17 @@ export default class PieChart {
     };
   }
 
-  get series() {
+  get series(): Series {
     return createSeries(this.rawData);
   }
 }
 
-function createSeries(rawData = []) {
-  const colors = [];
-  const data = [];
+function createSeries(rawData: RawData = []): Series {
+  const colors: string[] = [];
+  const data: {
+    name: string;
+    y: number;
+  }[] = [];
 
   const total = rawData.reduce((accumulator, datum) => {
     const { value } = datum;
diff --git a/app/utils/highcharts/spline-chart.js b/app/utils/highcharts/spline-chart.ts
similarity index 68%
rename from app/utils/highcharts/spline-chart.js
rename to app/utils/highcharts/spline-chart.ts
index 1333bfd19..8e8f15dac 100644
--- a/app/utils/highcharts/spline-chart.js
+++ b/app/utils/highcharts/spline-chart.ts
@@ -3,15 +3,34 @@
 */
 import { tracked } from '@glimmer/tracking';
 
+export type Chart = {
+  categories: string[];
+  subtitle?: string;
+  title: string;
+};
+
+export type RawData = {
+  color: string;
+  label: string;
+  values: (number | null)[];
+}[];
+
+type Series = {
+  color: string;
+  data: (number | null)[];
+  name: string;
+}[];
+
 export default class SplineChart {
-  @tracked chart;
-  @tracked rawData;
+  @tracked chart: Chart;
+  @tracked rawData?: RawData;
 
-  constructor({ chart, rawData }) {
+  constructor({ chart, rawData }: { chart: Chart; rawData: RawData }) {
     this.chart = chart;
     this.rawData = rawData;
   }
 
+  // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
   get highchartsOptions() {
     const { chart, isLegendEnabled, series } = this;
 
@@ -64,19 +83,19 @@ export default class SplineChart {
     };
   }
 
-  get isLegendEnabled() {
+  get isLegendEnabled(): boolean {
     const { series } = this;
 
     return series.length > 1;
   }
 
-  get series() {
+  get series(): Series {
     return createSeries(this.rawData);
   }
 }
 
-function createSeries(rawData = []) {
-  const data = [];
+function createSeries(rawData: RawData = []): Series {
+  const data: Series = [];
 
   rawData.forEach((datum) => {
     const { color, label, values } = datum;
diff --git a/app/utils/highcharts/vertical-bar-chart.js b/app/utils/highcharts/vertical-bar-chart.ts
similarity index 64%
rename from app/utils/highcharts/vertical-bar-chart.js
rename to app/utils/highcharts/vertical-bar-chart.ts
index 564a8696a..253dfb052 100644
--- a/app/utils/highcharts/vertical-bar-chart.js
+++ b/app/utils/highcharts/vertical-bar-chart.ts
@@ -3,15 +3,34 @@
 */
 import { tracked } from '@glimmer/tracking';
 
+export type Chart = {
+  categories?: string[];
+  subtitle?: string;
+  title: string;
+};
+
+export type RawData = {
+  color: string;
+  label: string;
+  values: (number | { name: string; y: number })[];
+}[];
+
+type Series = {
+  color: string;
+  data: (number | { name: string; y: number })[];
+  name: string;
+}[];
+
 export default class VerticalBarChart {
-  @tracked chart;
-  @tracked rawData;
+  @tracked chart: Chart;
+  @tracked rawData?: RawData;
 
-  constructor({ chart, rawData }) {
+  constructor({ chart, rawData }: { chart: Chart; rawData: RawData }) {
     this.chart = chart;
     this.rawData = rawData;
   }
 
+  // eslint-disable-next-line @typescript-eslint/explicit-function-return-type
   get highchartsOptions() {
     const { chart, isLegendEnabled, series } = this;
 
@@ -55,19 +74,19 @@ export default class VerticalBarChart {
     };
   }
 
-  get isLegendEnabled() {
+  get isLegendEnabled(): boolean {
     const { series } = this;
 
     return series.length > 1;
   }
 
-  get series() {
+  get series(): Series {
     return createSeries(this.rawData);
   }
 }
 
-function createSeries(rawData = []) {
-  const data = [];
+function createSeries(rawData: RawData = []): Series {
+  const data: Series = [];
 
   rawData.forEach((datum) => {
     const { color, label, values } = datum;
diff --git a/app/utils/navigate-tabs.js b/app/utils/navigate-tabs.ts
similarity index 73%
rename from app/utils/navigate-tabs.js
rename to app/utils/navigate-tabs.ts
index f55f5c35f..9b43e59ca 100644
--- a/app/utils/navigate-tabs.js
+++ b/app/utils/navigate-tabs.ts
@@ -3,9 +3,9 @@ const ALLOWED_KEYS = {
   ARROW_LEFT_IE11: 'Left',
   ARROW_RIGHT: 'ArrowRight',
   ARROW_RIGHT_IE11: 'Right',
-};
+} as const;
 
-export function getTabIdIncrement(event) {
+export function getTabIdIncrement(event: { key: string }): -1 | 1 | undefined {
   switch (event.key) {
     case ALLOWED_KEYS.ARROW_LEFT:
     case ALLOWED_KEYS.ARROW_LEFT_IE11: {
@@ -21,6 +21,6 @@ export function getTabIdIncrement(event) {
   return undefined;
 }
 
-export function modulus(m, n) {
+export function modulus(m: number, n: number): number {
   return ((m % n) + n) % n;
 }
diff --git a/app/utils/releases/lts.js b/app/utils/releases/lts.ts
similarity index 95%
rename from app/utils/releases/lts.js
rename to app/utils/releases/lts.ts
index 7f1b397ed..8cd41c37b 100644
--- a/app/utils/releases/lts.js
+++ b/app/utils/releases/lts.ts
@@ -1,6 +1,12 @@
+type Release = {
+  isActive: boolean;
+  promotionDate: Date;
+  version: string;
+};
+
 // promotion date should be the day of the release of the following ember minor version
 // you can run `npm info ember-source time` to see a list
-export const emberLtsReleases = [
+export const emberLtsReleases: Release[] = [
   {
     version: '6.12',
     promotionDate: new Date('2026-05-12'),
@@ -108,7 +114,7 @@ export const emberLtsReleases = [
   },
 ];
 
-export const dataLtsReleases = [
+export const dataLtsReleases: Release[] = [
   {
     version: '5.3',
     promotionDate: new Date('2023-12-10'),
diff --git a/app/utils/replace-links.js b/app/utils/replace-links.ts
similarity index 63%
rename from app/utils/replace-links.js
rename to app/utils/replace-links.ts
index 9ceb21b35..d174c665c 100644
--- a/app/utils/replace-links.js
+++ b/app/utils/replace-links.ts
@@ -4,14 +4,14 @@ const legacyExternalLinks = new Set([
   'https://emberjs.com/deprecations',
 ]);
 
-function isExternalLink(url) {
+function isExternalLink(url: string): boolean {
   const isExternalLink = !url.startsWith('https://emberjs.com');
   const isLegacyExternalLink = legacyExternalLinks.has(url);
 
   return isExternalLink || isLegacyExternalLink;
 }
 
-function replaceInternalLinks(url) {
+function replaceInternalLinks(url: string): string {
   if (isExternalLink(url)) {
     return url;
   }
@@ -24,16 +24,34 @@ function replaceInternalLinks(url) {
     .replace(/\/builds$/, '/releases');
 }
 
-export function replaceLinks(links) {
+type SimpleDivider = {
+  type: 'divider';
+};
+
+type SimpleLink = {
+  href: string;
+  name: string;
+  type: 'link';
+};
+
+type SimpleDropdown = {
+  items: Link[];
+  name: string;
+  type: 'dropdown';
+};
+
+export type Link = SimpleDivider | SimpleDropdown | SimpleLink;
+
+export function replaceLinks(links: Link[]): Link[] {
   return links.map((group) => {
-    if (group.items) {
+    if (group.type === 'dropdown') {
       return {
         ...group,
         items: replaceLinks(group.items),
       };
     }
 
-    if (group.href) {
+    if (group.type === 'link') {
       return {
         ...group,
         href: replaceInternalLinks(group.href),
diff --git a/app/utils/routes/index.ts b/app/utils/routes/index.ts
new file mode 100644
index 000000000..41a22704d
--- /dev/null
+++ b/app/utils/routes/index.ts
@@ -0,0 +1,14 @@
+/*
+  https://docs.ember-cli-typescript.com/cookbook/working-with-route-models
+*/
+import type Route from '@ember/routing/route';
+
+/**
+  Get the resolved type of an item.
+  - If the item is a promise, the result will be the resolved value type
+  - If the item is not a promise, the result will just be the type of the item
+ */
+type Resolved<P> = P extends Promise<infer T> ? T : P;
+
+/** Get the resolved model value from a route. */
+export type ModelFrom<R extends Route> = Resolved<ReturnType<R['model']>>;
diff --git a/app/utils/surveys/2016.js b/app/utils/surveys/2016.ts
similarity index 99%
rename from app/utils/surveys/2016.js
rename to app/utils/surveys/2016.ts
index e196c155b..d5ec7e01f 100644
--- a/app/utils/surveys/2016.js
+++ b/app/utils/surveys/2016.ts
@@ -14,6 +14,7 @@ const chartHowlong = new VerticalBarChart({
       '3–6 months',
       'Less than 3 months',
     ],
+    title: '',
   },
 
   rawData: [
diff --git a/app/utils/surveys/2017.js b/app/utils/surveys/2017.ts
similarity index 100%
rename from app/utils/surveys/2017.js
rename to app/utils/surveys/2017.ts
diff --git a/app/utils/surveys/2018.js b/app/utils/surveys/2018.ts
similarity index 100%
rename from app/utils/surveys/2018.js
rename to app/utils/surveys/2018.ts
diff --git a/app/utils/surveys/2019.js b/app/utils/surveys/2019.ts
similarity index 100%
rename from app/utils/surveys/2019.js
rename to app/utils/surveys/2019.ts
diff --git a/app/utils/surveys/2020.js b/app/utils/surveys/2020.ts
similarity index 100%
rename from app/utils/surveys/2020.js
rename to app/utils/surveys/2020.ts
diff --git a/app/utils/surveys/2022.js b/app/utils/surveys/2022.ts
similarity index 100%
rename from app/utils/surveys/2022.js
rename to app/utils/surveys/2022.ts
diff --git a/app/utils/teams/in-team.js b/app/utils/teams/in-team.js
deleted file mode 100644
index 51ef6391b..000000000
--- a/app/utils/teams/in-team.js
+++ /dev/null
@@ -1,5 +0,0 @@
-export function inTeam(team) {
-  return (teamMember) => {
-    return (teamMember.teams ?? []).includes(team);
-  };
-}
diff --git a/app/utils/teams/in-team.ts b/app/utils/teams/in-team.ts
new file mode 100644
index 000000000..169dd28d1
--- /dev/null
+++ b/app/utils/teams/in-team.ts
@@ -0,0 +1,9 @@
+type TeamMember = {
+  teams?: string[];
+};
+
+export function inTeam(team: string): (teamMember: TeamMember) => boolean {
+  return (teamMember) => {
+    return (teamMember.teams ?? []).includes(team);
+  };
+}
diff --git a/ember-cli-build.js b/ember-cli-build.js
index 1ee8ca851..4fb06b4a5 100644
--- a/ember-cli-build.js
+++ b/ember-cli-build.js
@@ -14,6 +14,10 @@ module.exports = function (defaults) {
       },
     },
 
+    'ember-cli-babel': {
+      enableTypeScriptTransform: true,
+    },
+
     'ember-composable-helpers': {
       only: ['filter-by', 'reject-by', 'sort-by'],
     },
diff --git a/eslint.config.mjs b/eslint.config.mjs
index 0f66ad6f4..f574cd00f 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -85,6 +85,18 @@ export default defineConfig([
       parser: eslintPluginEmber.parser,
       parserOptions: parserOptions.esm.ts,
     },
+    rules: {
+      '@typescript-eslint/consistent-type-imports': 'error',
+      '@typescript-eslint/explicit-function-return-type': 'error',
+      '@typescript-eslint/no-empty-object-type': [
+        'error',
+        {
+          allowInterfaces: 'always',
+          allowObjectTypes: 'always',
+        },
+      ],
+      '@typescript-eslint/no-import-type-side-effects': 'error',
+    },
   },
   {
     ...eslintPluginQunit.configs.recommended,
diff --git a/package.json b/package.json
index d19b7ee13..6e016e934 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "build": "ember build --environment=production",
     "format": "prettier . --cache --write",
     "lint": "concurrently \"pnpm:lint:*(!fix)\" --names \"lint:\"",
-    "lint:css": "stylelint \"**/*.css\" --cache",
+    "lint:css": "stylelint \"app/**/*.css\" --cache",
     "lint:css:fix": "stylelint \"app/**/*.css\" --fix",
     "lint:fix": "concurrently \"pnpm:lint:*:fix\" --names \"fix:\" && pnpm format",
     "lint:format": "prettier . --cache --check",
@@ -31,10 +31,15 @@
     "@babel/core": "^7.29.7",
     "@babel/eslint-parser": "^7.29.7",
     "@babel/plugin-proposal-decorators": "^7.29.7",
+    "@ember-data-types/adapter": "~5.7.0",
+    "@ember-data-types/model": "~5.7.0",
+    "@ember-data-types/serializer": "~5.7.0",
+    "@ember-data-types/store": "~5.7.0",
     "@ember/app-tsconfig": "^2.0.0",
     "@ember/optional-features": "^3.0.0",
     "@ember/string": "^4.0.1",
     "@ember/test-helpers": "^5.4.3",
+    "@embroider/config-meta-loader": "^1.0.0",
     "@eslint/js": "^9.39.5",
     "@glimmer/component": "^2.1.1",
     "@glimmer/tracking": "^1.1.2",
@@ -46,6 +51,7 @@
     "@percy/cli": "^1.32.7",
     "@percy/ember": "^5.0.2",
     "@types/qunit": "^2.19.14",
+    "@warp-drive-types/core-types": "~5.7.0",
     "algoliasearch": "^3.35.1",
     "blurhash": "^2.0.5",
     "broccoli-asset-rev": "^3.0.0",
@@ -71,6 +77,7 @@
     "ember-cli-terser": "^4.0.2",
     "ember-data": "~5.7.0",
     "ember-data-fastboot": "^0.1.2",
+    "ember-data-types": "~5.7.0",
     "ember-fetch": "^8.1.2",
     "ember-href-to": "^5.1.1",
     "ember-inflector": "^6.0.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 6110b29b3..895dffe53 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -24,6 +24,18 @@ importers:
       '@babel/plugin-proposal-decorators':
         specifier: ^7.29.7
         version: 7.29.7(@babel/core@7.29.7(supports-color@10.2.2))(supports-color@10.2.2)
+      '@ember-data-types/adapter':
+        specifier: ~5.7.0
+        version: 5.7.0
+      '@ember-data-types/model':
+        specifier: ~5.7.0
+        version: 5.7.0
+      '@ember-data-types/serializer':
+        specifier: ~5.7.0
+        version: 5.7.0
+      '@ember-data-types/store':
+        specifier: ~5.7.0
+        version: 5.7.0
       '@ember/app-tsconfig':
         specifier: ^2.0.0
         version: 2.0.0
@@ -36,6 +48,9 @@ importers:
       '@ember/test-helpers':
         specifier: ^5.4.3
         version: 5.4.3(@babel/core@7.29.7(supports-color@10.2.2))(supports-color@10.2.2)
+      '@embroider/config-meta-loader':
+        specifier: ^1.0.0
+        version: 1.0.0
       '@eslint/js':
         specifier: ^9.39.5
         version: 9.39.5
@@ -69,6 +84,9 @@ importers:
       '@types/qunit':
         specifier: ^2.19.14
         version: 2.19.14
+      '@warp-drive-types/core-types':
+        specifier: ~5.7.0
+        version: 5.7.0
       algoliasearch:
         specifier: ^3.35.1
         version: 3.35.1(supports-color@10.2.2)
@@ -144,6 +162,9 @@ importers:
       ember-data-fastboot:
         specifier: ^0.1.2
         version: 0.1.2(patch_hash=32da3248de941d97c233aeef4cd09b59d69a331edadf1a2f3840f1ed348ab371)(@babel/core@7.29.7(supports-color@10.2.2))(supports-color@10.2.2)
+      ember-data-types:
+        specifier: ~5.7.0
+        version: 5.7.0
       ember-fetch:
         specifier: ^8.1.2
         version: 8.1.2(supports-color@10.2.2)
@@ -917,6 +938,18 @@ packages:
     peerDependencies:
       postcss-selector-parser: ^7.1.1
 
+  '@ember-data-types/adapter@5.7.0':
+    resolution: {integrity: sha512-hIPaB8N/VOWC13t9aIJWbAHkInDp5gInhNu2jGWlweHGecDnUkobosG4v7dbD3IXdPjFNHoIR9AcqWZQ99xg7g==}
+
+  '@ember-data-types/model@5.7.0':
+    resolution: {integrity: sha512-S20lRMWLJpH9zQwgZQyvLLLgC1kEvhAikyfOUmPQe2L+3nLDAVjdkJHSU+dh60RRdgyDvEYeNFGftghX7dzKoA==}
+
+  '@ember-data-types/serializer@5.7.0':
+    resolution: {integrity: sha512-DiB+4BxvddZVxfqpHo1pcz+7wD+aETX/RVBTy0v7f4o6RoQk7FDpcP3M1zpHWwFvxnt2e4ONVoYrl8x8rDWuEw==}
+
+  '@ember-data-types/store@5.7.0':
+    resolution: {integrity: sha512-To+Ld0xmYZUtyidUXfPBl2kp2RQ89gfdpIcyc4qv0n0Fa5K76iDvIE5BORoslMEYi5jClPg6JjHnrciEhnRAUg==}
+
   '@ember-data/adapter@5.7.0':
     resolution: {integrity: sha512-H0EWf7CNlpxwJxygFA4qoRNdpuHHwxXrY94YXdd5kh/wDUn5vNke//tHiVPXJJPAM7Ndgsq4gw3mSDP1Uhg1hQ==}
 
@@ -1022,6 +1055,10 @@ packages:
     resolution: {integrity: sha512-GYbaiC1v9inbiwVg5s+Sd14Jc66NYxg23mEOocgWAZFCtOfhMnRLaLAA6SytW76myVVYImGHX5PFK4PVuH2yng==}
     engines: {node: 12.* || 14.* || >= 16}
 
+  '@embroider/config-meta-loader@1.0.0':
+    resolution: {integrity: sha512-qznkdjgEGPe6NM94hZNXvOm/WhrJwBh8FtSQZ+nGjh9TOjY42tOiTEevFuM0onNXUn6bpdGzmjwKo2xY2jxQxQ==}
+    engines: {node: 12.* || 14.* || >= 16}
+
   '@embroider/macros@1.20.2':
     resolution: {integrity: sha512-WJWSkG9vIL0s93vKwtNFqqAOCOflNkWNpqsC7VAqXeeTKNpCc7wtdOhPkNGJpb52CEt7vlQ5R/zMyCfGAB7MEA==}
     engines: {node: 12.* || 14.* || >= 16}
@@ -2179,6 +2216,9 @@ packages:
   '@vscode/l10n@0.0.18':
     resolution: {integrity: sha512-KYSIHVmslkaCDyw013pphY+d7x1qV8IZupYfeIfzNA+nsaWHbn5uPuQRvdRFsa9zFzGeudPuoGoZ1Op4jrJXIQ==}
 
+  '@warp-drive-types/core-types@5.7.0':
+    resolution: {integrity: sha512-3FymVgRr1/FcWFyAgY+619rR69gX5eeGsbZzyg0+XLHiYg3mzG+yFZomphEYraAokijSW9dE/Uvx75GzidgWbA==}
+
   '@warp-drive/build-config@5.7.0':
     resolution: {integrity: sha512-lCltr4xG9jQmBRlM8+gMJ06o3pnOHs7uDFdIX36dIczKCFjfTvaSVbYf+n/VLEAT4GyaMoQU11xkY1zHa5XucA==}
 
@@ -4246,6 +4286,9 @@ packages:
     resolution: {integrity: sha512-aPb318FGngnG0xbDc3/oz2L7tqgFj1qLZNdiqMI1TRMu9FL4zmrxw5WAGHyRt2ECSNssrbme/Zb8WcNhWTlHkA==}
     engines: {node: ^4.5 || 6.* || >= 7.*}
 
+  ember-data-types@5.7.0:
+    resolution: {integrity: sha512-zpbyWMCeVaVeH0UZ/yLTVITdVVVll/D55BUgs8J6m4OOr/2iKN3HGGdTJbVEfsTIzg2X4x04zmnS08QDRveA2w==}
+
   ember-data@5.7.0:
     resolution: {integrity: sha512-KPs+p5/F/YSIFsc0hYg+kaER8XoMhAzy+gOVAJhdtbFrhn3oftTogcAMTGo/glUpXnzwt8dSkN+GfNMWMPmSlw==}
     peerDependencies:
@@ -9679,6 +9722,14 @@ snapshots:
     dependencies:
       postcss-selector-parser: 7.1.5
 
+  '@ember-data-types/adapter@5.7.0': {}
+
+  '@ember-data-types/model@5.7.0': {}
+
+  '@ember-data-types/serializer@5.7.0': {}
+
+  '@ember-data-types/store@5.7.0': {}
+
   '@ember-data/adapter@5.7.0(@babel/core@7.29.7(supports-color@10.2.2))(@glint/template@1.9.0)(supports-color@10.2.2)':
     dependencies:
       '@ember/edition-utils': 1.2.0
@@ -9911,6 +9962,8 @@ snapshots:
     transitivePeerDependencies:
       - supports-color
 
+  '@embroider/config-meta-loader@1.0.0': {}
+
   '@embroider/macros@1.20.2(@babel/core@7.29.7(supports-color@10.2.2))(@glint/template@1.9.0)(supports-color@10.2.2)':
     dependencies:
       '@embroider/shared-internals': 3.0.2(supports-color@10.2.2)
@@ -11480,6 +11533,8 @@ snapshots:
 
   '@vscode/l10n@0.0.18': {}
 
+  '@warp-drive-types/core-types@5.7.0': {}
+
   '@warp-drive/build-config@5.7.0(@babel/core@7.29.7(supports-color@10.2.2))(@glint/template@1.9.0)(supports-color@10.2.2)':
     dependencies:
       '@embroider/addon-shim': 1.10.3(supports-color@10.2.2)
@@ -14583,6 +14638,8 @@ snapshots:
       - '@babel/core'
       - supports-color
 
+  ember-data-types@5.7.0: {}
+
   ember-data@5.7.0(@babel/core@7.29.7(supports-color@10.2.2))(@ember/test-helpers@5.4.3(@babel/core@7.29.7(supports-color@10.2.2))(supports-color@10.2.2))(@ember/test-waiters@4.1.2(supports-color@10.2.2))(@glint/template@1.9.0)(ember-inflector@6.0.0(@babel/core@7.29.7(supports-color@10.2.2))(supports-color@10.2.2))(qunit@2.26.0)(supports-color@10.2.2):
     dependencies:
       '@ember-data/adapter': 5.7.0(@babel/core@7.29.7(supports-color@10.2.2))(@glint/template@1.9.0)(supports-color@10.2.2)
diff --git a/tests/acceptance/about/legal-test.js b/tests/acceptance/about/legal-test.ts
similarity index 100%
rename from tests/acceptance/about/legal-test.js
rename to tests/acceptance/about/legal-test.ts
diff --git a/tests/acceptance/browser-support-test.js b/tests/acceptance/browser-support-test.ts
similarity index 100%
rename from tests/acceptance/browser-support-test.js
rename to tests/acceptance/browser-support-test.ts
diff --git a/tests/acceptance/community-test.js b/tests/acceptance/community-test.ts
similarity index 100%
rename from tests/acceptance/community-test.js
rename to tests/acceptance/community-test.ts
diff --git a/tests/acceptance/community/black-lives-matter-test.js b/tests/acceptance/community/black-lives-matter-test.ts
similarity index 100%
rename from tests/acceptance/community/black-lives-matter-test.js
rename to tests/acceptance/community/black-lives-matter-test.ts
diff --git a/tests/acceptance/community/meetups-getting-started-test.js b/tests/acceptance/community/meetups-getting-started-test.ts
similarity index 100%
rename from tests/acceptance/community/meetups-getting-started-test.js
rename to tests/acceptance/community/meetups-getting-started-test.ts
diff --git a/tests/acceptance/community/meetups-test.js b/tests/acceptance/community/meetups-test.ts
similarity index 100%
rename from tests/acceptance/community/meetups-test.js
rename to tests/acceptance/community/meetups-test.ts
diff --git a/tests/acceptance/community/meetups/assets-test.js b/tests/acceptance/community/meetups/assets-test.ts
similarity index 100%
rename from tests/acceptance/community/meetups/assets-test.js
rename to tests/acceptance/community/meetups/assets-test.ts
diff --git a/tests/acceptance/editions-test.js b/tests/acceptance/editions-test.ts
similarity index 100%
rename from tests/acceptance/editions-test.js
rename to tests/acceptance/editions-test.ts
diff --git a/tests/acceptance/editions/octane-test.js b/tests/acceptance/editions/octane-test.ts
similarity index 100%
rename from tests/acceptance/editions/octane-test.js
rename to tests/acceptance/editions/octane-test.ts
diff --git a/tests/acceptance/ember-users-test.js b/tests/acceptance/ember-users-test.ts
similarity index 100%
rename from tests/acceptance/ember-users-test.js
rename to tests/acceptance/ember-users-test.ts
diff --git a/tests/acceptance/guidelines-test.js b/tests/acceptance/guidelines-test.ts
similarity index 100%
rename from tests/acceptance/guidelines-test.js
rename to tests/acceptance/guidelines-test.ts
diff --git a/tests/acceptance/index-test.js b/tests/acceptance/index-test.ts
similarity index 87%
rename from tests/acceptance/index-test.js
rename to tests/acceptance/index-test.ts
index 204233fc2..2e67493b2 100644
--- a/tests/acceptance/index-test.js
+++ b/tests/acceptance/index-test.ts
@@ -5,7 +5,10 @@ import { setupApplicationTest } from 'ember-qunit';
 import { assertPageTitle } from 'ember-website/tests/helpers/page-title';
 import { module, test } from 'qunit';
 
-function assertParentNavItems(assert, expectedOutput = []) {
+function assertParentNavItems(
+  assert: Assert,
+  expectedOutput: { label: string }[] = [],
+): void {
   const parentNavItems = findAll('.navbar-list-item');
 
   assert.strictEqual(
@@ -22,13 +25,17 @@ function assertParentNavItems(assert, expectedOutput = []) {
     assert
       .dom(parentNavItem)
       .hasText(
-        expectedOutput[index].label,
+        expectedOutput[index]!.label,
         `The label for the parent navigation item is correct. (${index + 1})`,
       );
   });
 }
 
-function assertChildNavItems(assert, expectedOutput = [], scope = document) {
+function assertChildNavItems(
+  assert: Assert,
+  expectedOutput: { href: string; label: string }[] = [],
+  scope: Document | Element = document,
+): void {
   const childNavItems = scope.querySelectorAll(
     '.navbar-dropdown-list-item-link',
   );
@@ -47,12 +54,12 @@ function assertChildNavItems(assert, expectedOutput = [], scope = document) {
     assert
       .dom(childNavItem)
       .hasText(
-        expectedOutput[index].label,
+        expectedOutput[index]!.label,
         `The label for the child navigation item is correct. (${index + 1})`,
       )
       .hasAttribute(
         'href',
-        expectedOutput[index].href,
+        expectedOutput[index]!.href,
         `The URL for the child navigation item is correct. (${index + 1})`,
       );
   });
@@ -111,7 +118,7 @@ module('Acceptance | index', function (hooks) {
 
     assertChildNavItems(assert, [], parentNavItems[3]);
 
-    await click(parentNavItems[3].querySelector('button'));
+    await click(parentNavItems[3]!.querySelector('button')!);
 
     assertChildNavItems(
       assert,
@@ -128,11 +135,11 @@ module('Acceptance | index', function (hooks) {
     );
 
     // Navigate to another page
-    const childNavItems = parentNavItems[3].querySelectorAll(
+    const childNavItems = parentNavItems[3]!.querySelectorAll(
       '.navbar-dropdown-list-item-link',
     );
 
-    await click(childNavItems[0]);
+    await click(childNavItems[0]!);
 
     assert.strictEqual(
       currentURL(),
diff --git a/tests/acceptance/learn-test.js b/tests/acceptance/learn-test.ts
similarity index 100%
rename from tests/acceptance/learn-test.js
rename to tests/acceptance/learn-test.ts
diff --git a/tests/acceptance/learn/examples-test.js b/tests/acceptance/learn/examples-test.ts
similarity index 100%
rename from tests/acceptance/learn/examples-test.js
rename to tests/acceptance/learn/examples-test.ts
diff --git a/tests/acceptance/logos-test.js b/tests/acceptance/logos-test.ts
similarity index 100%
rename from tests/acceptance/logos-test.js
rename to tests/acceptance/logos-test.ts
diff --git a/tests/acceptance/mascots-test.js b/tests/acceptance/mascots-test.ts
similarity index 100%
rename from tests/acceptance/mascots-test.js
rename to tests/acceptance/mascots-test.ts
diff --git a/tests/acceptance/mascots/commission-sent-test.js b/tests/acceptance/mascots/commission-sent-test.ts
similarity index 100%
rename from tests/acceptance/mascots/commission-sent-test.js
rename to tests/acceptance/mascots/commission-sent-test.ts
diff --git a/tests/acceptance/mascots/commission-test.js b/tests/acceptance/mascots/commission-test.ts
similarity index 100%
rename from tests/acceptance/mascots/commission-test.js
rename to tests/acceptance/mascots/commission-test.ts
diff --git a/tests/acceptance/mascots/faq-test.js b/tests/acceptance/mascots/faq-test.ts
similarity index 100%
rename from tests/acceptance/mascots/faq-test.js
rename to tests/acceptance/mascots/faq-test.ts
diff --git a/tests/acceptance/mascots/payment-sent-test.js b/tests/acceptance/mascots/payment-sent-test.ts
similarity index 100%
rename from tests/acceptance/mascots/payment-sent-test.js
rename to tests/acceptance/mascots/payment-sent-test.ts
diff --git a/tests/acceptance/mascots/payment-test.js b/tests/acceptance/mascots/payment-test.ts
similarity index 100%
rename from tests/acceptance/mascots/payment-test.js
rename to tests/acceptance/mascots/payment-test.ts
diff --git a/tests/acceptance/not-found-test.js b/tests/acceptance/not-found-test.ts
similarity index 100%
rename from tests/acceptance/not-found-test.js
rename to tests/acceptance/not-found-test.ts
diff --git a/tests/acceptance/releases-test.js b/tests/acceptance/releases-test.ts
similarity index 100%
rename from tests/acceptance/releases-test.js
rename to tests/acceptance/releases-test.ts
diff --git a/tests/acceptance/releases/beta-test.js b/tests/acceptance/releases/beta-test.ts
similarity index 100%
rename from tests/acceptance/releases/beta-test.js
rename to tests/acceptance/releases/beta-test.ts
diff --git a/tests/acceptance/releases/canary-test.js b/tests/acceptance/releases/canary-test.ts
similarity index 100%
rename from tests/acceptance/releases/canary-test.js
rename to tests/acceptance/releases/canary-test.ts
diff --git a/tests/acceptance/releases/lts-test.js b/tests/acceptance/releases/lts-test.ts
similarity index 100%
rename from tests/acceptance/releases/lts-test.js
rename to tests/acceptance/releases/lts-test.ts
diff --git a/tests/acceptance/releases/release-test.js b/tests/acceptance/releases/release-test.ts
similarity index 100%
rename from tests/acceptance/releases/release-test.js
rename to tests/acceptance/releases/release-test.ts
diff --git a/tests/acceptance/security-test.js b/tests/acceptance/security-test.ts
similarity index 100%
rename from tests/acceptance/security-test.js
rename to tests/acceptance/security-test.ts
diff --git a/tests/acceptance/sponsors-test.js b/tests/acceptance/sponsors-test.ts
similarity index 100%
rename from tests/acceptance/sponsors-test.js
rename to tests/acceptance/sponsors-test.ts
diff --git a/tests/acceptance/survey-test.js b/tests/acceptance/survey-test.ts
similarity index 100%
rename from tests/acceptance/survey-test.js
rename to tests/acceptance/survey-test.ts
diff --git a/tests/acceptance/survey/2016-test.js b/tests/acceptance/survey/2016-test.ts
similarity index 100%
rename from tests/acceptance/survey/2016-test.js
rename to tests/acceptance/survey/2016-test.ts
diff --git a/tests/acceptance/survey/2017-test.js b/tests/acceptance/survey/2017-test.ts
similarity index 100%
rename from tests/acceptance/survey/2017-test.js
rename to tests/acceptance/survey/2017-test.ts
diff --git a/tests/acceptance/survey/2018-test.js b/tests/acceptance/survey/2018-test.ts
similarity index 100%
rename from tests/acceptance/survey/2018-test.js
rename to tests/acceptance/survey/2018-test.ts
diff --git a/tests/acceptance/survey/2019-test.js b/tests/acceptance/survey/2019-test.ts
similarity index 100%
rename from tests/acceptance/survey/2019-test.js
rename to tests/acceptance/survey/2019-test.ts
diff --git a/tests/acceptance/survey/2020-test.js b/tests/acceptance/survey/2020-test.ts
similarity index 100%
rename from tests/acceptance/survey/2020-test.js
rename to tests/acceptance/survey/2020-test.ts
diff --git a/tests/acceptance/survey/2021-test.js b/tests/acceptance/survey/2021-test.ts
similarity index 100%
rename from tests/acceptance/survey/2021-test.js
rename to tests/acceptance/survey/2021-test.ts
diff --git a/tests/acceptance/survey/2022-test.js b/tests/acceptance/survey/2022-test.ts
similarity index 100%
rename from tests/acceptance/survey/2022-test.js
rename to tests/acceptance/survey/2022-test.ts
diff --git a/tests/acceptance/team-redirect-test.js b/tests/acceptance/team-redirect-test.ts
similarity index 100%
rename from tests/acceptance/team-redirect-test.js
rename to tests/acceptance/team-redirect-test.ts
diff --git a/tests/acceptance/teams-test.js b/tests/acceptance/teams-test.ts
similarity index 100%
rename from tests/acceptance/teams-test.js
rename to tests/acceptance/teams-test.ts
diff --git a/tests/helpers/highcharts.js b/tests/helpers/highcharts.ts
similarity index 60%
rename from tests/helpers/highcharts.js
rename to tests/helpers/highcharts.ts
index 365a6d69a..35da86953 100644
--- a/tests/helpers/highcharts.js
+++ b/tests/helpers/highcharts.ts
@@ -1,10 +1,12 @@
 import { findAll, waitUntil } from '@ember/test-helpers';
 
-export async function waitUntilAllChartsAreDrawn() {
+export async function waitUntilAllChartsAreDrawn(): Promise<void> {
   await waitUntil(() => {
     let areAllChartsSettled = true;
 
-    findAll('[data-test-chart]').forEach(({ dataset }) => {
+    findAll('[data-test-chart]').forEach((element) => {
+      const { dataset } = element as HTMLElement;
+
       if (dataset.renderState !== 'settled') {
         areAllChartsSettled = false;
       }
diff --git a/tests/helpers/index.js b/tests/helpers/index.ts
similarity index 57%
rename from tests/helpers/index.js
rename to tests/helpers/index.ts
index ab04c162d..cd12a7e41 100644
--- a/tests/helpers/index.js
+++ b/tests/helpers/index.ts
@@ -2,38 +2,32 @@ import {
   setupApplicationTest as upstreamSetupApplicationTest,
   setupRenderingTest as upstreamSetupRenderingTest,
   setupTest as upstreamSetupTest,
+  type SetupTestOptions,
 } from 'ember-qunit';
 
 // This file exists to provide wrappers around ember-qunit's
 // test setup functions. This way, you can easily extend the setup that is
 // needed per test type.
 
-function setupApplicationTest(hooks, options) {
+function setupApplicationTest(
+  hooks: NestedHooks,
+  options?: SetupTestOptions,
+): void {
   upstreamSetupApplicationTest(hooks, options);
 
   // Additional setup for application tests can be done here.
-  //
-  // For example, if you need an authenticated session for each
-  // application test, you could do:
-  //
-  // hooks.beforeEach(async function () {
-  //   await authenticateSession(); // ember-simple-auth
-  // });
-  //
-  // This is also a good place to call test setup functions coming
-  // from other addons:
-  //
-  // setupIntl(hooks, 'en-us'); // ember-intl
-  // setupMirage(hooks); // ember-cli-mirage
 }
 
-function setupRenderingTest(hooks, options) {
+function setupRenderingTest(
+  hooks: NestedHooks,
+  options?: SetupTestOptions,
+): void {
   upstreamSetupRenderingTest(hooks, options);
 
   // Additional setup for rendering tests can be done here.
 }
 
-function setupTest(hooks, options) {
+function setupTest(hooks: NestedHooks, options?: SetupTestOptions): void {
   upstreamSetupTest(hooks, options);
 
   // Additional setup for unit tests can be done here.
diff --git a/tests/helpers/page-title.js b/tests/helpers/page-title.ts
similarity index 84%
rename from tests/helpers/page-title.js
rename to tests/helpers/page-title.ts
index 754880f3a..2790310af 100644
--- a/tests/helpers/page-title.js
+++ b/tests/helpers/page-title.ts
@@ -1,6 +1,6 @@
 import { getPageTitle } from 'ember-page-title/test-support';
 
-export function assertPageTitle(assert, expectedValue) {
+export function assertPageTitle(assert: Assert, expectedValue: string): void {
   // Check the <title> element
   assert.strictEqual(
     getPageTitle(),
diff --git a/tests/integration/helpers/add-weeks-test.gjs b/tests/integration/helpers/add-weeks-test.gts
similarity index 100%
rename from tests/integration/helpers/add-weeks-test.gjs
rename to tests/integration/helpers/add-weeks-test.gts
diff --git a/tests/integration/helpers/format-date-time-test.gjs b/tests/integration/helpers/format-date-time-test.gts
similarity index 100%
rename from tests/integration/helpers/format-date-time-test.gjs
rename to tests/integration/helpers/format-date-time-test.gts
diff --git a/tests/integration/helpers/printf-test.gjs b/tests/integration/helpers/printf-test.gts
similarity index 100%
rename from tests/integration/helpers/printf-test.gjs
rename to tests/integration/helpers/printf-test.gts
diff --git a/tests/integration/helpers/qp-test.gts b/tests/integration/helpers/qp-test.gts
new file mode 100644
index 000000000..117a7b6ba
--- /dev/null
+++ b/tests/integration/helpers/qp-test.gts
@@ -0,0 +1,16 @@
+import { render } from '@ember/test-helpers';
+import { setupRenderingTest } from 'ember-qunit';
+import qp from 'ember-website/helpers/qp';
+import { module, test } from 'qunit';
+
+module('Integration | Helper | qp', function (hooks) {
+  setupRenderingTest(hooks);
+
+  test('it works', async function (assert) {
+    const key = 'uwu';
+
+    await render(<template>{{if (qp key) "true" "false"}}</template>);
+
+    assert.dom().hasText('false');
+  });
+});
diff --git a/tests/integration/modifiers/draw-chart-test.gjs b/tests/integration/modifiers/draw-chart-test.gts
similarity index 100%
rename from tests/integration/modifiers/draw-chart-test.gjs
rename to tests/integration/modifiers/draw-chart-test.gts
diff --git a/tests/test-helper.js b/tests/test-helper.ts
similarity index 100%
rename from tests/test-helper.js
rename to tests/test-helper.ts
diff --git a/tests/unit/adapters/application-test.js b/tests/unit/adapters/application-test.ts
similarity index 78%
rename from tests/unit/adapters/application-test.js
rename to tests/unit/adapters/application-test.ts
index b9c19c3d0..4b9ee4ac6 100644
--- a/tests/unit/adapters/application-test.js
+++ b/tests/unit/adapters/application-test.ts
@@ -1,11 +1,14 @@
 import { setupTest } from 'ember-qunit';
+import type ApplicationAdapter from 'ember-website/adapters/application';
 import { module, test } from 'qunit';
 
 module('Unit | Adapter | application', function (hooks) {
   setupTest(hooks);
 
   test('urlForFindAll works', function (assert) {
-    const adapter = this.owner.lookup('adapter:application');
+    const adapter = this.owner.lookup(
+      'adapter:application',
+    ) as ApplicationAdapter;
 
     assert.strictEqual(
       adapter.urlForFindAll('project'),
@@ -21,7 +24,9 @@ module('Unit | Adapter | application', function (hooks) {
   });
 
   test('urlForFindRecord works', function (assert) {
-    const adapter = this.owner.lookup('adapter:application');
+    const adapter = this.owner.lookup(
+      'adapter:application',
+    ) as ApplicationAdapter;
 
     assert.strictEqual(
       adapter.urlForFindRecord('ember/release', 'project'),
diff --git a/tests/unit/models/initiative-sponsor-test.ts b/tests/unit/models/initiative-sponsor-test.ts
new file mode 100644
index 000000000..d8a46bec2
--- /dev/null
+++ b/tests/unit/models/initiative-sponsor-test.ts
@@ -0,0 +1,17 @@
+import type InitiativeSponsor from 'ember-website/models/initiative-sponsor';
+import { setupTest } from 'ember-website/tests/helpers';
+import { module, test } from 'qunit';
+
+module('Unit | Model | initiative-sponsor', function (hooks) {
+  setupTest(hooks);
+
+  test('it exists', function (assert) {
+    const store = this.owner.lookup('service:store');
+    const model = store.createRecord<InitiativeSponsor>(
+      'initiative-sponsor',
+      {},
+    );
+
+    assert.ok(model);
+  });
+});
diff --git a/tests/unit/models/meetup-test.ts b/tests/unit/models/meetup-test.ts
new file mode 100644
index 000000000..92825491f
--- /dev/null
+++ b/tests/unit/models/meetup-test.ts
@@ -0,0 +1,14 @@
+import type MeetupModel from 'ember-website/models/meetup';
+import { setupTest } from 'ember-website/tests/helpers';
+import { module, test } from 'qunit';
+
+module('Unit | Model | meetup', function (hooks) {
+  setupTest(hooks);
+
+  test('it exists', function (assert) {
+    const store = this.owner.lookup('service:store');
+    const model = store.createRecord<MeetupModel>('meetup', {});
+
+    assert.ok(model);
+  });
+});
diff --git a/tests/unit/models/project-test.js b/tests/unit/models/project-test.ts
similarity index 58%
rename from tests/unit/models/project-test.js
rename to tests/unit/models/project-test.ts
index ed854370d..2c5fd1b3c 100644
--- a/tests/unit/models/project-test.js
+++ b/tests/unit/models/project-test.ts
@@ -1,16 +1,23 @@
+import type { Registry as Services } from '@ember/service';
+import type { TestContext as BaseTestContext } from '@ember/test-helpers';
 import { setupTest } from 'ember-qunit';
+import type Project from 'ember-website/models/project';
 import { module, test } from 'qunit';
 
+interface TestContext extends BaseTestContext {
+  store: Services['store'];
+}
+
 module('Unit | Model | project', function (hooks) {
   setupTest(hooks);
 
   module('Ember.js', function (hooks) {
-    hooks.beforeEach(function () {
+    hooks.beforeEach(function (this: TestContext) {
       this.store = this.owner.lookup('service:store');
     });
 
-    test('The model can generate a lastReleaseChangelogUrl correctly', function (assert) {
-      const model = this.store.createRecord('project', {
+    test('The model can generate a lastReleaseChangelogUrl correctly', function (this: TestContext, assert) {
+      const model = this.store.createRecord<Project>('project', {
         repo: 'face/mine.js',
         lastRelease: '7',
         changelogPath: 'CHANGELOG.md',
@@ -22,14 +29,12 @@ module('Unit | Model | project', function (hooks) {
       );
     });
 
-    test('No lastReleaseChangelogUrl is generated if changelogPath is missing', function (assert) {
-      const model = this.store.createRecord('project', {
+    test('No lastReleaseChangelogUrl is generated if changelogPath is missing', function (this: TestContext, assert) {
+      const model = this.store.createRecord<Project>('project', {
         repo: 'face/mine.js',
         lastRelease: '7',
       });
 
-      assert.ok(model, 'We can create the record.');
-
       assert.strictEqual(model.lastReleaseChangelogUrl, '');
     });
   });
diff --git a/tests/unit/models/showcase-test.ts b/tests/unit/models/showcase-test.ts
new file mode 100644
index 000000000..dd91081c1
--- /dev/null
+++ b/tests/unit/models/showcase-test.ts
@@ -0,0 +1,14 @@
+import type Showcase from 'ember-website/models/showcase';
+import { setupTest } from 'ember-website/tests/helpers';
+import { module, test } from 'qunit';
+
+module('Unit | Model | showcase', function (hooks) {
+  setupTest(hooks);
+
+  test('it exists', function (assert) {
+    const store = this.owner.lookup('service:store');
+    const model = store.createRecord<Showcase>('showcase', {});
+
+    assert.ok(model);
+  });
+});
diff --git a/tests/unit/models/sponsor-test.js b/tests/unit/models/sponsor-test.ts
similarity index 58%
rename from tests/unit/models/sponsor-test.js
rename to tests/unit/models/sponsor-test.ts
index 9dc719357..68f20f95d 100644
--- a/tests/unit/models/sponsor-test.js
+++ b/tests/unit/models/sponsor-test.ts
@@ -1,21 +1,26 @@
+import type { Registry as Services } from '@ember/service';
+import type { TestContext as BaseTestContext } from '@ember/test-helpers';
 import { setupTest } from 'ember-qunit';
+import type Sponsor from 'ember-website/models/sponsor';
 import { module, test } from 'qunit';
 
+interface TestContext extends BaseTestContext {
+  store: Services['store'];
+}
+
 module('Unit | Model | sponsor', function (hooks) {
   setupTest(hooks);
 
-  hooks.beforeEach(function () {
+  hooks.beforeEach(function (this: TestContext) {
     this.store = this.owner.lookup('service:store');
   });
 
-  test('The model can describe a current sponsor', function (assert) {
-    const model = this.store.createRecord('sponsor', {
+  test('The model can describe a current sponsor', function (this: TestContext, assert) {
+    const model = this.store.createRecord<Sponsor>('sponsor', {
       name: 'Super Corp.',
       start: new Date('2011-01-01'),
     });
 
-    assert.ok(model, 'We can create the record.');
-
     assert.strictEqual(
       model.term,
       '2011 - present',
@@ -23,15 +28,13 @@ module('Unit | Model | sponsor', function (hooks) {
     );
   });
 
-  test('The model can describe a past sponsor that spanned multiple years', function (assert) {
-    const model = this.store.createRecord('sponsor', {
+  test('The model can describe a past sponsor that spanned multiple years', function (this: TestContext, assert) {
+    const model = this.store.createRecord<Sponsor>('sponsor', {
       name: 'Super Corp.',
       start: new Date('2015-01-01'),
       end: new Date('2018-01-01'),
     });
 
-    assert.ok(model, 'We can create the record.');
-
     assert.strictEqual(
       model.term,
       '2015 - 2018',
@@ -39,15 +42,13 @@ module('Unit | Model | sponsor', function (hooks) {
     );
   });
 
-  test('The model can describe a past sponsor that only sponsored one year', function (assert) {
-    const model = this.store.createRecord('sponsor', {
+  test('The model can describe a past sponsor that only sponsored one year', function (this: TestContext, assert) {
+    const model = this.store.createRecord<Sponsor>('sponsor', {
       name: 'Super Corp.',
       start: new Date('2018-01-01'),
       end: new Date('2018-08-01'),
     });
 
-    assert.ok(model, 'We can create the record.');
-
     assert.strictEqual(
       model.term,
       '2018',
diff --git a/tests/unit/models/team-member-test.ts b/tests/unit/models/team-member-test.ts
new file mode 100644
index 000000000..c165335c0
--- /dev/null
+++ b/tests/unit/models/team-member-test.ts
@@ -0,0 +1,14 @@
+import type TeamMember from 'ember-website/models/team-member';
+import { setupTest } from 'ember-website/tests/helpers';
+import { module, test } from 'qunit';
+
+module('Unit | Model | team-member', function (hooks) {
+  setupTest(hooks);
+
+  test('it exists', function (assert) {
+    const store = this.owner.lookup('service:store');
+    const model = store.createRecord<TeamMember>('team-member', {});
+
+    assert.ok(model);
+  });
+});
diff --git a/tests/unit/models/tomster-test.ts b/tests/unit/models/tomster-test.ts
new file mode 100644
index 000000000..2c79c7475
--- /dev/null
+++ b/tests/unit/models/tomster-test.ts
@@ -0,0 +1,14 @@
+import type Tomster from 'ember-website/models/tomster';
+import { setupTest } from 'ember-website/tests/helpers';
+import { module, test } from 'qunit';
+
+module('Unit | Model | tomster', function (hooks) {
+  setupTest(hooks);
+
+  test('it exists', function (assert) {
+    const store = this.owner.lookup('service:store');
+    const model = store.createRecord<Tomster>('tomster', {});
+
+    assert.ok(model);
+  });
+});
diff --git a/tests/unit/models/user-test.ts b/tests/unit/models/user-test.ts
new file mode 100644
index 000000000..9601e4aed
--- /dev/null
+++ b/tests/unit/models/user-test.ts
@@ -0,0 +1,14 @@
+import type User from 'ember-website/models/user';
+import { setupTest } from 'ember-website/tests/helpers';
+import { module, test } from 'qunit';
+
+module('Unit | Model | user', function (hooks) {
+  setupTest(hooks);
+
+  test('it exists', function (assert) {
+    const store = this.owner.lookup('service:store');
+    const model = store.createRecord<User>('user', {});
+
+    assert.ok(model);
+  });
+});
diff --git a/tests/unit/serializers/application-test.js b/tests/unit/serializers/application-test.js
deleted file mode 100644
index 1f1b8a444..000000000
--- a/tests/unit/serializers/application-test.js
+++ /dev/null
@@ -1,23 +0,0 @@
-import { setupTest } from 'ember-qunit';
-import { module, test } from 'qunit';
-
-module('Unit | Serializer | application', function (hooks) {
-  setupTest(hooks);
-
-  // Replace this with your real tests.
-  test('it exists', function (assert) {
-    let store = this.owner.lookup('service:store');
-    let serializer = store.serializerFor('application');
-
-    assert.ok(serializer);
-  });
-
-  test('it serializes records', function (assert) {
-    let store = this.owner.lookup('service:store');
-    let record = store.createRecord('tomster', {});
-
-    let serializedRecord = record.serialize();
-
-    assert.ok(serializedRecord);
-  });
-});
diff --git a/tests/unit/serializers/application-test.ts b/tests/unit/serializers/application-test.ts
new file mode 100644
index 000000000..68fe26749
--- /dev/null
+++ b/tests/unit/serializers/application-test.ts
@@ -0,0 +1,28 @@
+import type ApplicationSerializer from 'ember-website/serializers/application';
+import { setupTest } from 'ember-qunit';
+import type Tomster from 'ember-website/models/tomster';
+import { module, test } from 'qunit';
+
+module('Unit | Serializer | application', function (hooks) {
+  setupTest(hooks);
+
+  test('it exists', function (assert) {
+    const store = this.owner.lookup('service:store');
+
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-call
+    const serializer = store.serializerFor(
+      'application',
+    ) as ApplicationSerializer;
+
+    assert.ok(serializer);
+  });
+
+  test('it serializes records', function (assert) {
+    const store = this.owner.lookup('service:store');
+
+    const record = store.createRecord<Tomster>('tomster', {});
+    const serializedRecord = record.serialize();
+
+    assert.ok(serializedRecord);
+  });
+});
diff --git a/tests/unit/services/head-data-test.ts b/tests/unit/services/head-data-test.ts
new file mode 100644
index 000000000..adf06e33c
--- /dev/null
+++ b/tests/unit/services/head-data-test.ts
@@ -0,0 +1,12 @@
+import { setupTest } from 'ember-qunit';
+import { module, test } from 'qunit';
+
+module('Unit | Service | head-data', function (hooks) {
+  setupTest(hooks);
+
+  test('it exists', function (assert) {
+    const service = this.owner.lookup('service:head-data');
+
+    assert.strictEqual(service.pageTitle, undefined);
+  });
+});
diff --git a/tests/unit/services/page-title-test.ts b/tests/unit/services/page-title-test.ts
new file mode 100644
index 000000000..205f565f3
--- /dev/null
+++ b/tests/unit/services/page-title-test.ts
@@ -0,0 +1,12 @@
+import { setupTest } from 'ember-qunit';
+import { module, test } from 'qunit';
+
+module('Unit | Service | page-title', function (hooks) {
+  setupTest(hooks);
+
+  test('it exists', function (assert) {
+    const service = this.owner.lookup('service:page-title');
+
+    assert.ok(service);
+  });
+});
diff --git a/tests/unit/utils/format-url-test.js b/tests/unit/utils/format-url-test.ts
similarity index 100%
rename from tests/unit/utils/format-url-test.js
rename to tests/unit/utils/format-url-test.ts
diff --git a/tests/unit/utils/highcharts/area-spline-chart-test.js b/tests/unit/utils/highcharts/area-spline-chart-test.ts
similarity index 77%
rename from tests/unit/utils/highcharts/area-spline-chart-test.js
rename to tests/unit/utils/highcharts/area-spline-chart-test.ts
index 190824e73..ebe1a8b5a 100644
--- a/tests/unit/utils/highcharts/area-spline-chart-test.js
+++ b/tests/unit/utils/highcharts/area-spline-chart-test.ts
@@ -1,8 +1,18 @@
+import type { TestContext as BaseTestContext } from '@ember/test-helpers';
 import AreaSplineChart from 'ember-website/utils/highcharts/area-spline-chart';
+import type {
+  Chart,
+  RawData,
+} from 'ember-website/utils/highcharts/area-spline-chart';
 import { module, test } from 'qunit';
 
+interface TestContext extends BaseTestContext {
+  chart: Chart;
+  rawData: RawData;
+}
+
 module('Unit | Utility | highcharts/area-spline-chart', function (hooks) {
-  hooks.beforeEach(function () {
+  hooks.beforeEach(function (this: TestContext) {
     this.chart = {
       categories: ['1.x', '2.x', '3.0-3.4', '3.5-3.8', '3.9-3.12', '3.13-3.16'],
       subtitle: '(Multi-select question)',
@@ -36,20 +46,23 @@ module('Unit | Utility | highcharts/area-spline-chart', function (hooks) {
   });
 
   module('highchartsOptions', function () {
-    test('returns a configuration object that is compatible with Highcharts', function (assert) {
+    test('returns a configuration object that is compatible with Highcharts', function (this: TestContext, assert) {
       const { highchartsOptions } = new AreaSplineChart({
         chart: this.chart,
         rawData: this.rawData,
       });
 
       // We tested `legend` in a separate module
+      // @ts-expect-error: Incorrect type
       delete highchartsOptions.legend;
 
       // We tested `series` in a separate module
+      // @ts-expect-error: Incorrect type
       delete highchartsOptions.series;
 
       assert.deepEqual(
         highchartsOptions,
+        // @ts-expect-error: Incorrect type
         {
           chart: {
             backgroundColor: 'transparent',
@@ -95,8 +108,8 @@ module('Unit | Utility | highcharts/area-spline-chart', function (hooks) {
   });
 
   module('isLegendEnabled', function () {
-    test('returns true when series has more than 1 element', function (assert) {
-      const rawData = this.rawData;
+    test('returns true when series has more than 1 element', function (this: TestContext, assert) {
+      const rawData: RawData = this.rawData;
 
       const { isLegendEnabled } = new AreaSplineChart({
         chart: this.chart,
@@ -106,8 +119,8 @@ module('Unit | Utility | highcharts/area-spline-chart', function (hooks) {
       assert.true(isLegendEnabled, 'We get the correct value.');
     });
 
-    test('returns false when series has 1 element', function (assert) {
-      const rawData = [this.rawData[0]];
+    test('returns false when series has 1 element', function (this: TestContext, assert) {
+      const rawData: RawData = [this.rawData[0]!];
 
       const { isLegendEnabled } = new AreaSplineChart({
         chart: this.chart,
@@ -117,8 +130,8 @@ module('Unit | Utility | highcharts/area-spline-chart', function (hooks) {
       assert.false(isLegendEnabled, 'We get the correct value.');
     });
 
-    test('returns false when series has 0 elements', function (assert) {
-      const rawData = [];
+    test('returns false when series has 0 elements', function (this: TestContext, assert) {
+      const rawData: RawData = [];
 
       const { isLegendEnabled } = new AreaSplineChart({
         chart: this.chart,
@@ -130,7 +143,7 @@ module('Unit | Utility | highcharts/area-spline-chart', function (hooks) {
   });
 
   module('series', function () {
-    test('transforms rawData into an array that is compatible with Highcharts', function (assert) {
+    test('transforms rawData into an array that is compatible with Highcharts', function (this: TestContext, assert) {
       const { series } = new AreaSplineChart({
         chart: this.chart,
         rawData: this.rawData,
@@ -141,9 +154,9 @@ module('Unit | Utility | highcharts/area-spline-chart', function (hooks) {
       // Check series 1
       assert.deepEqual(
         {
-          color: series[0].color,
-          data: series[0].data.map(Math.round),
-          name: series[0].name,
+          color: series[0]!.color,
+          data: series[0]!.data.map(Math.round),
+          name: series[0]!.name,
         },
         {
           color: '#1E719B',
@@ -156,9 +169,9 @@ module('Unit | Utility | highcharts/area-spline-chart', function (hooks) {
       // Check series 2
       assert.deepEqual(
         {
-          color: series[1].color,
-          data: series[1].data.map(Math.round),
-          name: series[1].name,
+          color: series[1]!.color,
+          data: series[1]!.data.map(Math.round),
+          name: series[1]!.name,
         },
         {
           color: '#9B2918',
diff --git a/tests/unit/utils/highcharts/horizontal-bar-chart-test.js b/tests/unit/utils/highcharts/horizontal-bar-chart-test.ts
similarity index 80%
rename from tests/unit/utils/highcharts/horizontal-bar-chart-test.js
rename to tests/unit/utils/highcharts/horizontal-bar-chart-test.ts
index 7c1413ea1..3e38e5e4a 100644
--- a/tests/unit/utils/highcharts/horizontal-bar-chart-test.js
+++ b/tests/unit/utils/highcharts/horizontal-bar-chart-test.ts
@@ -1,8 +1,18 @@
+import type { TestContext as BaseTestContext } from '@ember/test-helpers';
 import HorizontalBarChart from 'ember-website/utils/highcharts/horizontal-bar-chart';
+import type {
+  Chart,
+  RawData,
+} from 'ember-website/utils/highcharts/horizontal-bar-chart';
 import { module, test } from 'qunit';
 
+interface TestContext extends BaseTestContext {
+  chart: Chart;
+  rawData: RawData;
+}
+
 module('Unit | Utility | highcharts/horizontal-bar-chart', function (hooks) {
-  hooks.beforeEach(function () {
+  hooks.beforeEach(function (this: TestContext) {
     this.chart = {
       categories: [
         'Writing RFCs',
@@ -31,20 +41,23 @@ module('Unit | Utility | highcharts/horizontal-bar-chart', function (hooks) {
   });
 
   module('highchartsOptions', function () {
-    test('returns a configuration object that is compatible with Highcharts', function (assert) {
+    test('returns a configuration object that is compatible with Highcharts', function (this: TestContext, assert) {
       const { highchartsOptions } = new HorizontalBarChart({
         chart: this.chart,
         rawData: this.rawData,
       });
 
       // We tested `legend` in a separate module
+      // @ts-expect-error: Incorrect type
       delete highchartsOptions.legend;
 
       // We tested `series` in a separate module
+      // @ts-expect-error: Incorrect type
       delete highchartsOptions.series;
 
       assert.deepEqual(
         highchartsOptions,
+        // @ts-expect-error: Incorrect type
         {
           chart: {
             backgroundColor: 'transparent',
@@ -91,8 +104,8 @@ module('Unit | Utility | highcharts/horizontal-bar-chart', function (hooks) {
   });
 
   module('isLegendEnabled', function () {
-    test('returns true when series has more than 1 element', function (assert) {
-      const rawData = this.rawData;
+    test('returns true when series has more than 1 element', function (this: TestContext, assert) {
+      const rawData: RawData = this.rawData;
 
       const { isLegendEnabled } = new HorizontalBarChart({
         chart: this.chart,
@@ -102,8 +115,8 @@ module('Unit | Utility | highcharts/horizontal-bar-chart', function (hooks) {
       assert.true(isLegendEnabled, 'We get the correct value.');
     });
 
-    test('returns false when series has 1 element', function (assert) {
-      const rawData = [this.rawData[0]];
+    test('returns false when series has 1 element', function (this: TestContext, assert) {
+      const rawData: RawData = [this.rawData[0]!];
 
       const { isLegendEnabled } = new HorizontalBarChart({
         chart: this.chart,
@@ -113,8 +126,8 @@ module('Unit | Utility | highcharts/horizontal-bar-chart', function (hooks) {
       assert.false(isLegendEnabled, 'We get the correct value.');
     });
 
-    test('returns false when series has 0 elements', function (assert) {
-      const rawData = [];
+    test('returns false when series has 0 elements', function (this: TestContext, assert) {
+      const rawData: RawData = [];
 
       const { isLegendEnabled } = new HorizontalBarChart({
         chart: this.chart,
@@ -126,7 +139,7 @@ module('Unit | Utility | highcharts/horizontal-bar-chart', function (hooks) {
   });
 
   module('series', function () {
-    test('transforms rawData into an array that is compatible with Highcharts', function (assert) {
+    test('transforms rawData into an array that is compatible with Highcharts', function (this: TestContext, assert) {
       const { series } = new HorizontalBarChart({
         chart: this.chart,
         rawData: this.rawData,
diff --git a/tests/unit/utils/highcharts/index-test.js b/tests/unit/utils/highcharts/index-test.ts
similarity index 100%
rename from tests/unit/utils/highcharts/index-test.js
rename to tests/unit/utils/highcharts/index-test.ts
index 42c8f62e7..22ed32e6c 100644
--- a/tests/unit/utils/highcharts/index-test.js
+++ b/tests/unit/utils/highcharts/index-test.ts
@@ -1,4 +1,3 @@
-import { setupTest } from 'ember-qunit';
 import {
   AreaSplineChart,
   HorizontalBarChart,
@@ -6,6 +5,7 @@ import {
   SplineChart,
   VerticalBarChart,
 } from 'ember-website/utils/highcharts/index';
+import { setupTest } from 'ember-qunit';
 import { module, test } from 'qunit';
 
 module('Unit | Utility | highcharts/index', function (hooks) {
diff --git a/tests/unit/utils/highcharts/pie-chart-test.js b/tests/unit/utils/highcharts/pie-chart-test.ts
similarity index 81%
rename from tests/unit/utils/highcharts/pie-chart-test.js
rename to tests/unit/utils/highcharts/pie-chart-test.ts
index dd6ff8d88..7a6e06ac7 100644
--- a/tests/unit/utils/highcharts/pie-chart-test.js
+++ b/tests/unit/utils/highcharts/pie-chart-test.ts
@@ -1,8 +1,15 @@
+import type { TestContext as BaseTestContext } from '@ember/test-helpers';
 import PieChart from 'ember-website/utils/highcharts/pie-chart';
+import type { Chart, RawData } from 'ember-website/utils/highcharts/pie-chart';
 import { module, test } from 'qunit';
 
+interface TestContext extends BaseTestContext {
+  chart: Chart;
+  rawData: RawData;
+}
+
 module('Unit | Utility | highcharts/pie-chart', function (hooks) {
-  hooks.beforeEach(function () {
+  hooks.beforeEach(function (this: TestContext) {
     this.chart = {
       title: 'Do you internationalize your applications?',
     };
@@ -14,17 +21,19 @@ module('Unit | Utility | highcharts/pie-chart', function (hooks) {
   });
 
   module('highchartsOptions', function () {
-    test('returns a configuration object that is compatible with Highcharts', function (assert) {
+    test('returns a configuration object that is compatible with Highcharts', function (this: TestContext, assert) {
       const { highchartsOptions } = new PieChart({
         chart: this.chart,
         rawData: this.rawData,
       });
 
       // We tested `series` in a separate module
+      // @ts-expect-error: Incorrect type
       delete highchartsOptions.series;
 
       assert.deepEqual(
         highchartsOptions,
+        // @ts-expect-error: Incorrect type
         {
           chart: {
             backgroundColor: 'transparent',
@@ -49,7 +58,7 @@ module('Unit | Utility | highcharts/pie-chart', function (hooks) {
   });
 
   module('series', function () {
-    test('transforms rawData into an array that is compatible with Highcharts', function (assert) {
+    test('transforms rawData into an array that is compatible with Highcharts', function (this: TestContext, assert) {
       const { series } = new PieChart({
         chart: this.chart,
         rawData: this.rawData,
diff --git a/tests/unit/utils/highcharts/spline-chart-test.js b/tests/unit/utils/highcharts/spline-chart-test.ts
similarity index 83%
rename from tests/unit/utils/highcharts/spline-chart-test.js
rename to tests/unit/utils/highcharts/spline-chart-test.ts
index ffe667426..79ad0d674 100644
--- a/tests/unit/utils/highcharts/spline-chart-test.js
+++ b/tests/unit/utils/highcharts/spline-chart-test.ts
@@ -1,8 +1,18 @@
+import type { TestContext as BaseTestContext } from '@ember/test-helpers';
 import SplineChart from 'ember-website/utils/highcharts/spline-chart';
+import type {
+  Chart,
+  RawData,
+} from 'ember-website/utils/highcharts/spline-chart';
 import { module, test } from 'qunit';
 
+interface TestContext extends BaseTestContext {
+  chart: Chart;
+  rawData: RawData;
+}
+
 module('Unit | Utility | highcharts/spline-chart', function (hooks) {
-  hooks.beforeEach(function () {
+  hooks.beforeEach(function (this: TestContext) {
     this.chart = {
       categories: [
         '1.13',
@@ -53,20 +63,23 @@ module('Unit | Utility | highcharts/spline-chart', function (hooks) {
   });
 
   module('highchartsOptions', function () {
-    test('returns a configuration object that is compatible with Highcharts', function (assert) {
+    test('returns a configuration object that is compatible with Highcharts', function (this: TestContext, assert) {
       const { highchartsOptions } = new SplineChart({
         chart: this.chart,
         rawData: this.rawData,
       });
 
       // We tested `legend` in a separate module
+      // @ts-expect-error: Incorrect type
       delete highchartsOptions.legend;
 
       // We tested `series` in a separate module
+      // @ts-expect-error: Incorrect type
       delete highchartsOptions.series;
 
       assert.deepEqual(
         highchartsOptions,
+        // @ts-expect-error: Incorrect type
         {
           chart: {
             backgroundColor: 'transparent',
@@ -129,8 +142,8 @@ module('Unit | Utility | highcharts/spline-chart', function (hooks) {
   });
 
   module('isLegendEnabled', function () {
-    test('returns true when series has more than 1 element', function (assert) {
-      const rawData = this.rawData;
+    test('returns true when series has more than 1 element', function (this: TestContext, assert) {
+      const rawData: RawData = this.rawData;
 
       const { isLegendEnabled } = new SplineChart({
         chart: this.chart,
@@ -140,8 +153,8 @@ module('Unit | Utility | highcharts/spline-chart', function (hooks) {
       assert.true(isLegendEnabled, 'We get the correct value.');
     });
 
-    test('returns false when series has 1 element', function (assert) {
-      const rawData = [this.rawData[0]];
+    test('returns false when series has 1 element', function (this: TestContext, assert) {
+      const rawData: RawData = [this.rawData[0]!];
 
       const { isLegendEnabled } = new SplineChart({
         chart: this.chart,
@@ -151,8 +164,8 @@ module('Unit | Utility | highcharts/spline-chart', function (hooks) {
       assert.false(isLegendEnabled, 'We get the correct value.');
     });
 
-    test('returns false when series has 0 elements', function (assert) {
-      const rawData = [];
+    test('returns false when series has 0 elements', function (this: TestContext, assert) {
+      const rawData: RawData = [];
 
       const { isLegendEnabled } = new SplineChart({
         chart: this.chart,
@@ -164,7 +177,7 @@ module('Unit | Utility | highcharts/spline-chart', function (hooks) {
   });
 
   module('series', function () {
-    test('transforms rawData into an array that is compatible with Highcharts', function (assert) {
+    test('transforms rawData into an array that is compatible with Highcharts', function (this: TestContext, assert) {
       const { series } = new SplineChart({
         chart: this.chart,
         rawData: this.rawData,
diff --git a/tests/unit/utils/highcharts/vertical-bar-chart-test.js b/tests/unit/utils/highcharts/vertical-bar-chart-test.ts
similarity index 81%
rename from tests/unit/utils/highcharts/vertical-bar-chart-test.js
rename to tests/unit/utils/highcharts/vertical-bar-chart-test.ts
index cb969cbcb..e570e5958 100644
--- a/tests/unit/utils/highcharts/vertical-bar-chart-test.js
+++ b/tests/unit/utils/highcharts/vertical-bar-chart-test.ts
@@ -1,8 +1,18 @@
+import type { TestContext as BaseTestContext } from '@ember/test-helpers';
 import VerticalBarChart from 'ember-website/utils/highcharts/vertical-bar-chart';
+import type {
+  Chart,
+  RawData,
+} from 'ember-website/utils/highcharts/vertical-bar-chart';
 import { module, test } from 'qunit';
 
+interface TestContext extends BaseTestContext {
+  chart: Chart;
+  rawData: RawData;
+}
+
 module('Unit | Utility | highcharts/vertical-bar-chart', function (hooks) {
-  hooks.beforeEach(function () {
+  hooks.beforeEach(function (this: TestContext) {
     this.chart = {
       categories: ['Beginner', 'Intermediate', 'Advanced'],
       title: 'Rank your web skills',
@@ -33,20 +43,23 @@ module('Unit | Utility | highcharts/vertical-bar-chart', function (hooks) {
   });
 
   module('highchartsOptions', function () {
-    test('returns a configuration object that is compatible with Highcharts', function (assert) {
+    test('returns a configuration object that is compatible with Highcharts', function (this: TestContext, assert) {
       const { highchartsOptions } = new VerticalBarChart({
         chart: this.chart,
         rawData: this.rawData,
       });
 
       // We tested `legend` in a separate module
+      // @ts-expect-error: Incorrect type
       delete highchartsOptions.legend;
 
       // We tested `series` in a separate module
+      // @ts-expect-error: Incorrect type
       delete highchartsOptions.series;
 
       assert.deepEqual(
         highchartsOptions,
+        // @ts-expect-error: Incorrect type
         {
           chart: {
             backgroundColor: 'transparent',
@@ -85,8 +98,8 @@ module('Unit | Utility | highcharts/vertical-bar-chart', function (hooks) {
   });
 
   module('isLegendEnabled', function () {
-    test('returns true when series has more than 1 element', function (assert) {
-      const rawData = this.rawData;
+    test('returns true when series has more than 1 element', function (this: TestContext, assert) {
+      const rawData: RawData = this.rawData;
 
       const { isLegendEnabled } = new VerticalBarChart({
         chart: this.chart,
@@ -96,8 +109,8 @@ module('Unit | Utility | highcharts/vertical-bar-chart', function (hooks) {
       assert.true(isLegendEnabled, 'We get the correct value.');
     });
 
-    test('returns false when series has 1 element', function (assert) {
-      const rawData = [this.rawData[0]];
+    test('returns false when series has 1 element', function (this: TestContext, assert) {
+      const rawData: RawData = [this.rawData[0]!];
 
       const { isLegendEnabled } = new VerticalBarChart({
         chart: this.chart,
@@ -107,8 +120,8 @@ module('Unit | Utility | highcharts/vertical-bar-chart', function (hooks) {
       assert.false(isLegendEnabled, 'We get the correct value.');
     });
 
-    test('returns false when series has 0 elements', function (assert) {
-      const rawData = [];
+    test('returns false when series has 0 elements', function (this: TestContext, assert) {
+      const rawData: RawData = [];
 
       const { isLegendEnabled } = new VerticalBarChart({
         chart: this.chart,
@@ -120,7 +133,7 @@ module('Unit | Utility | highcharts/vertical-bar-chart', function (hooks) {
   });
 
   module('series', function () {
-    test('transforms rawData into an array that is compatible with Highcharts', function (assert) {
+    test('transforms rawData into an array that is compatible with Highcharts', function (this: TestContext, assert) {
       const { series } = new VerticalBarChart({
         chart: this.chart,
         rawData: this.rawData,
diff --git a/tests/unit/utils/navigate-tabs-test.js b/tests/unit/utils/navigate-tabs-test.ts
similarity index 58%
rename from tests/unit/utils/navigate-tabs-test.js
rename to tests/unit/utils/navigate-tabs-test.ts
index 27ccfc357..995414605 100644
--- a/tests/unit/utils/navigate-tabs-test.js
+++ b/tests/unit/utils/navigate-tabs-test.ts
@@ -46,61 +46,25 @@ module('Unit | Utility | navigate-tabs', function () {
     });
   });
 
-  module('modulus', function (hooks) {
-    hooks.beforeEach(function () {
-      this.numTabs = 4;
-    });
-
+  module('modulus', function () {
     test('calculates m % n when m is a nonnegative number', function (assert) {
-      assert.strictEqual(
-        modulus(0, this.numTabs),
-        0,
-        'We get the correct output.',
-      );
+      assert.strictEqual(modulus(0, 4), 0, 'We get the correct output.');
 
-      assert.strictEqual(
-        modulus(1, this.numTabs),
-        1,
-        'We get the correct output.',
-      );
+      assert.strictEqual(modulus(1, 4), 1, 'We get the correct output.');
 
-      assert.strictEqual(
-        modulus(2, this.numTabs),
-        2,
-        'We get the correct output.',
-      );
+      assert.strictEqual(modulus(2, 4), 2, 'We get the correct output.');
 
-      assert.strictEqual(
-        modulus(3, this.numTabs),
-        3,
-        'We get the correct output.',
-      );
+      assert.strictEqual(modulus(3, 4), 3, 'We get the correct output.');
     });
 
     test('calculates m % n when m is a negative number', function (assert) {
-      assert.strictEqual(
-        modulus(-4, this.numTabs),
-        0,
-        'We get the correct output.',
-      );
+      assert.strictEqual(modulus(-4, 4), 0, 'We get the correct output.');
 
-      assert.strictEqual(
-        modulus(-3, this.numTabs),
-        1,
-        'We get the correct output.',
-      );
+      assert.strictEqual(modulus(-3, 4), 1, 'We get the correct output.');
 
-      assert.strictEqual(
-        modulus(-2, this.numTabs),
-        2,
-        'We get the correct output.',
-      );
+      assert.strictEqual(modulus(-2, 4), 2, 'We get the correct output.');
 
-      assert.strictEqual(
-        modulus(-1, this.numTabs),
-        3,
-        'We get the correct output.',
-      );
+      assert.strictEqual(modulus(-1, 4), 3, 'We get the correct output.');
     });
   });
 });
diff --git a/tests/unit/utils/releases/lts-test.js b/tests/unit/utils/releases/lts-test.ts
similarity index 100%
rename from tests/unit/utils/releases/lts-test.js
rename to tests/unit/utils/releases/lts-test.ts
diff --git a/tests/unit/utils/replace-links-test.js b/tests/unit/utils/replace-links-test.ts
similarity index 99%
rename from tests/unit/utils/replace-links-test.js
rename to tests/unit/utils/replace-links-test.ts
index d0673ece1..71ad7f162 100644
--- a/tests/unit/utils/replace-links-test.js
+++ b/tests/unit/utils/replace-links-test.ts
@@ -1,4 +1,4 @@
-import { replaceLinks } from 'ember-website/utils/replace-links';
+import { type Link, replaceLinks } from 'ember-website/utils/replace-links';
 import { module, test } from 'qunit';
 
 module('Unit | Utility | replace-links', function () {
@@ -9,7 +9,7 @@ module('Unit | Utility | replace-links', function () {
 
       See https://github.com/ember-learn/ember-styleguide/blob/ab1d1fc32dd023f287c49d3fd700216ba368771a/addon/constants/links.js
     */
-    const links = [
+    const links: Link[] = [
       {
         name: 'Docs',
         type: 'dropdown',
@@ -368,7 +368,7 @@ module('Unit | Utility | replace-links', function () {
 
       See https://github.com/ember-learn/ember-website/blob/d08e34a0acd403d16ee78c90ec0ec368762e3e9f/app/links.js
     */
-    const links = [
+    const links: Link[] = [
       {
         name: 'Docs',
         type: 'dropdown',
diff --git a/tests/unit/utils/surveys/2016-test.js b/tests/unit/utils/surveys/2016-test.ts
similarity index 100%
rename from tests/unit/utils/surveys/2016-test.js
rename to tests/unit/utils/surveys/2016-test.ts
diff --git a/tests/unit/utils/surveys/2017-test.js b/tests/unit/utils/surveys/2017-test.ts
similarity index 100%
rename from tests/unit/utils/surveys/2017-test.js
rename to tests/unit/utils/surveys/2017-test.ts
diff --git a/tests/unit/utils/surveys/2018-test.js b/tests/unit/utils/surveys/2018-test.ts
similarity index 100%
rename from tests/unit/utils/surveys/2018-test.js
rename to tests/unit/utils/surveys/2018-test.ts
diff --git a/tests/unit/utils/surveys/2019-test.js b/tests/unit/utils/surveys/2019-test.ts
similarity index 100%
rename from tests/unit/utils/surveys/2019-test.js
rename to tests/unit/utils/surveys/2019-test.ts
diff --git a/tests/unit/utils/surveys/2020-test.js b/tests/unit/utils/surveys/2020-test.ts
similarity index 100%
rename from tests/unit/utils/surveys/2020-test.js
rename to tests/unit/utils/surveys/2020-test.ts
diff --git a/tests/unit/utils/surveys/2022-test.js b/tests/unit/utils/surveys/2022-test.ts
similarity index 100%
rename from tests/unit/utils/surveys/2022-test.js
rename to tests/unit/utils/surveys/2022-test.ts
diff --git a/tests/unit/utils/teams/in-team-test.js b/tests/unit/utils/teams/in-team-test.ts
similarity index 100%
rename from tests/unit/utils/teams/in-team-test.js
rename to tests/unit/utils/teams/in-team-test.ts
diff --git a/tsconfig.json b/tsconfig.json
index 4d305d2c1..c35c750d1 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,17 +13,44 @@
     ],
     "rootDir": ".",
     "target": "esnext",
-    "types": ["@glint/ember-tsc/types", "@types/qunit", "ember-source/types"]
+    "types": [
+      "@ember-data-types/adapter/unstable-preview-types",
+      "@ember-data-types/model/unstable-preview-types",
+      "@ember-data-types/serializer/unstable-preview-types",
+      "@ember-data-types/store/unstable-preview-types",
+      "@glint/ember-tsc/types",
+      "@types/qunit",
+      "@warp-drive-types/core-types/unstable-preview-types",
+      "ember-data-types/unstable-preview-types",
+      "ember-source/types"
+    ]
   },
   "include": ["app/**/*", "tests/**/*", "types/**/*"],
   "glint": {
     "additionalSpecialForms": {
-      "globals": {
-        "and": "&&",
-        "eq": "===",
-        "not": "!",
-        "neq": "!==",
-        "or": "||"
+      "imports": {
+        "ember-truth-helpers": {
+          "and": "&&",
+          "eq": "===",
+          "not": "!",
+          "not-eq": "!==",
+          "or": "||"
+        },
+        "ember-truth-helpers/helpers/and": {
+          "default": "&&"
+        },
+        "ember-truth-helpers/helpers/eq": {
+          "default": "==="
+        },
+        "ember-truth-helpers/helpers/not": {
+          "default": "!"
+        },
+        "ember-truth-helpers/helpers/not-eq": {
+          "default": "!=="
+        },
+        "ember-truth-helpers/helpers/or": {
+          "default": "||"
+        }
       }
     }
   }
diff --git a/types/global.d.ts b/types/global.d.ts
index e69de29bb..a1fc83bce 100644
--- a/types/global.d.ts
+++ b/types/global.d.ts
@@ -0,0 +1,7 @@
+import type StoreService from '@ember-data/store';
+
+declare module '@ember/service' {
+  export interface Registry {
+    store: StoreService;
+  }
+}