matrix: verify the four newest runtime releases; timeline marks LTS toolchains

Toolchain versions carry an lts flag where the notion exists: the Node.js
feed provides it and the JDK list declares it. The detail timeline shows
an LTS chip next to those versions.

Author: rigor789

data/toolchains.json

@@ -19,13 +19,17 @@
 		{ "version": "30.0.3" }
 	],
 	"jdk": [
-		{ "version": "25" },
-		{ "version": "21" },
-		{ "version": "17" },
-		{ "version": "11" },
-		{ "version": "8" }
+		{ "version": "25", "lts": true },
+		{ "version": "21", "lts": true },
+		{ "version": "17", "lts": true },
+		{ "version": "11", "lts": true },
+		{ "version": "8", "lts": true }
 	],
 	"xcode": [{ "version": "26.3" }, { "version": "26.2" }, { "version": "16.4" }],
-	"node": [{ "version": "24.0.0" }, { "version": "22.0.0" }, { "version": "20.0.0" }],
+	"node": [
+		{ "version": "24.0.0", "lts": true },
+		{ "version": "22.0.0", "lts": true },
+		{ "version": "20.0.0", "lts": true }
+	],
 	"cocoapods": [{ "version": "1.16.2" }, { "version": "1.15.2" }]
 }

schemas/compatibility.json

@@ -38,6 +38,10 @@
 						"prerelease": {
 							"type": "boolean"
 						},
+						"lts": {
+							"type": "boolean",
+							"description": "A long-term-support line, where the toolchain has the notion."
+						},
 						"date": {
 							"type": "string"
 						}

scripts/build-matrix.mjs

@@ -25,7 +25,7 @@ const ADOPTIUM_RELEASES = "https://api.adoptium.net/v3/info/available_releases";
 const RUNNER_IMAGES_README = "https://raw.githubusercontent.com/actions/runner-images/main/README.md";
 
 const CLI_VERSIONS = 2; // newest stable CLI releases
-const RUNTIME_VERSIONS = 2; // newest stable releases of each runtime
+const RUNTIME_VERSIONS = 4; // newest stable releases of each runtime
 const NODE_MAJORS = 2; // newest even (LTS-track) Node.js majors
 const XCODE_LINES = 4; // newest major.minor lines
 const ANDROID_LEVELS = 3; // newest API levels

shared/compute.ts

@@ -368,7 +368,7 @@ export interface CellSummary {
 	verified: string[];
 	advisories: Advisory[];
 	/** State of every known toolchain version, newest first, for the detail view. */
-	breakdown: Array<{ version: string; prerelease?: boolean; cell: Cell }>;
+	breakdown: Array<{ version: string; prerelease?: boolean; lts?: boolean; cell: Cell }>;
 	/** The newest stable toolchain version and how this package version fares with it. */
 	latest?: { version: string; cell: Cell };
 	/** A prerelease toolchain newer than `latest`, when one is known. */
@@ -400,6 +400,7 @@ export function summarizeCell(
 	const breakdown = document.toolchains[key].map((tool) => ({
 		version: tool.version,
 		prerelease: tool.prerelease,
+		lts: tool.lts,
 		cell: cellFor(document, packageName, version, key, tool.version),
 	}));
 	const latest = breakdown.find((item) => !item.prerelease);

shared/types.ts

@@ -23,6 +23,8 @@ export const TOOLCHAIN_LABELS: Record<ToolchainKey, string> = {
 export interface ToolchainVersion {
 	version: string;
 	prerelease?: boolean;
+	/** A long-term-support line, where the toolchain has the notion (Node.js, JDK). */
+	lts?: boolean;
 	/** ISO date the version shipped, when the feed provides one. */
 	date?: string;
 }

test/compute.test.ts

@@ -201,7 +201,7 @@ describe("latest supported", () => {
 	it("names the newest usable version when the newest stable one is not", () => {
 		const doc = buildDocument({
 			generatedAt: "2026-09-09T00:00:00.000Z",
-			toolchains: { xcode: [], cocoapods: [], compileSdk: [], buildTools: [], jdk: [{ version: "26", prerelease: true }, { version: "25" }, { version: "21" }, { version: "17" }], node: [] },
+			toolchains: { xcode: [], cocoapods: [], compileSdk: [], buildTools: [], jdk: [{ version: "26", prerelease: true }, { version: "25" }, { version: "21", lts: true }, { version: "17" }], node: [] },
 			packages: [
 				{
 					spec: { name: "@nativescript/android", toolchains: ["jdk"], keep: 5 },
@@ -215,6 +215,7 @@ describe("latest supported", () => {
 			],
 		});
 		const cell = summarizeCell(doc, "@nativescript/android", "9.1.1", "jdk");
+		expect(cell.breakdown.find((item) => item.version === "21")?.lts).toBe(true);
 		expect(cell.latest).toMatchObject({ version: "25", cell: { state: "unsupported" } });
 		expect(cell.latestSupported).toMatchObject({ version: "21", cell: { state: "verified" } });
 		expect(cell.prerelease).toMatchObject({ version: "26" });

web/src/components/CellDetails.vue

@@ -4,6 +4,7 @@ import type { CellSummary } from "../../../shared/compute";
 import { TOOLCHAIN_LABELS, type CellState, type CompatibilityDocument, type ToolchainKey } from "../../../shared/types";
 import { STATE_HELP } from "../states";
 import BetaChip from "./BetaChip.vue";
+import Chip from "./Chip.vue";
 import StateIcon from "./StateIcon.vue";
 
 const INITIAL_NODES = 5;
@@ -104,6 +105,7 @@ function shortDate(version: string): string {
 				<span class="flex h-6 items-center gap-1 text-sm leading-6 font-semibold tabular-nums whitespace-nowrap" :class="LABEL[item.cell.state]">
 					{{ item.version }}
 					<BetaChip v-if="item.prerelease" />
+					<Chip v-else-if="item.lts" :title="`${label} ${item.version} is a long-term-support line`">LTS</Chip>
 				</span>
 				<span class="relative flex h-6 w-full items-center justify-center">
 					<span

worker/sources/toolchains.ts

@@ -72,13 +72,19 @@ async function fetchNode(): Promise<ToolchainVersion[]> {
 	const releases = (await (await fetch(NODE_FEED)).json()) as Array<{
 		version: string;
 		date: string;
+		/** The LTS codename once the line enters LTS, false before. */
+		lts: string | false;
 	}>;
 	// Latest release per major line, newest majors first.
 	const byMajor = new Map<number, ToolchainVersion>();
 	for (const release of releases) {
 		const major = semver.major(release.version);
 		if (!byMajor.has(major)) {
-			byMajor.set(major, { version: release.version.replace(/^v/, ""), date: release.date });
+			byMajor.set(major, {
+				version: release.version.replace(/^v/, ""),
+				lts: release.lts ? true : undefined,
+				date: release.date,
+			});
 		}
 	}
 	return Array.from(byMajor.entries())