Replace ESLint + Prettier with Biome

__tests__/main.test.ts

@@ -1,10 +1,10 @@
+import {expect, test} from '@jest/globals'
 import {
-  FileMod,
   changedFiles,
-  fileModsToPaths,
-  fileModsByStatus
+  FileMod,
+  fileModsByStatus,
+  fileModsToPaths
 } from '../src/changed-files'
-import {expect, test} from '@jest/globals'
 
 test('test FileMod[] to string[] for filenames', async () => {
   const files: FileMod[] = [

biome.json

@@ -0,0 +1,81 @@
+{
+  "$schema": "https://biomejs.dev/schemas/2.4.16/schema.json",
+  "vcs": { "enabled": true, "clientKind": "git", "useIgnoreFile": true },
+  "files": {
+    "includes": ["**", "!!**/dist"]
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineEnding": "lf",
+    "lineWidth": 80,
+    "includes": ["**", "!**/dist/", "!**/lib/", "!**/node_modules/"]
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "single",
+      "semicolons": "asNeeded",
+      "trailingCommas": "none",
+      "arrowParentheses": "asNeeded",
+      "bracketSpacing": false
+    }
+  },
+  "linter": {
+    "enabled": true,
+    "rules": { "recommended": false },
+    "includes": [
+      "**",
+      "!**/dist/",
+      "!**/lib/",
+      "!**/node_modules/",
+      "!**/jest.config.js"
+    ]
+  },
+  "overrides": [
+    {
+      "includes": ["src/**/*.ts", "src/**/*.tsx"],
+      "linter": {
+        "rules": {
+          "complexity": {
+            "noStaticOnlyClass": "error"
+          },
+          "correctness": {
+            "noUnusedVariables": "error"
+          },
+          "style": {
+            "noCommonJs": "error",
+            "noInferrableTypes": "error",
+            "noNamespace": "error",
+            "noNonNullAssertion": "warn",
+            "useArrayLiterals": "error",
+            "useConsistentArrayType": "error",
+            "useConsistentMemberAccessibility": {
+              "level": "error",
+              "options": { "accessibility": "noPublic" }
+            },
+            "useForOf": "warn"
+          },
+          "suspicious": {
+            "noEmptyInterface": "error",
+            "noExplicitAny": "off",
+            "noMisleadingInstantiator": "error",
+            "noTsIgnore": "error"
+          }
+        }
+      }
+    },
+    {
+      "includes": ["**/*.test.ts", "**/*.test.tsx", "__tests__/**/*.ts"],
+      "linter": {
+        "rules": {
+          "suspicious": { "noExplicitAny": "off" }
+        }
+      }
+    }
+  ],
+  "assist": {
+    "enabled": true,
+    "actions": { "source": { "organizeImports": "on" } }
+  }
+}

index.js

@@ -1,18 +1,14 @@
-const core = require('@actions/core');
-const github = require('@actions/github');
+const core = require('@actions/core')
+const github = require('@actions/github')
 
 try {
   // get action metadata inputs
-  const separator = core.getInput('separator');
-  const patternsToIgnore = core.getInput('ignore_file_patterns');
-  const patternsToFocus = core.getInput('only_file_patterns');
-
-
-
-
+  const separator = core.getInput('separator')
+  const patternsToIgnore = core.getInput('ignore_file_patterns')
+  const patternsToFocus = core.getInput('only_file_patterns')
 
   // Get the JSON webhook payload for the event that triggered the workflow
   const payload = JSON.stringify(github.context.payload, undefined, 2)
 } catch (error) {
-  core.setFailed(error.message);
+  core.setFailed(error.message)
 }

jest.config.js

@@ -1,9 +1,9 @@
 module.exports = {
-    clearMocks: true,
-    moduleFileExtensions: ['js', 'ts'],
-    testMatch: ['**/*.test.ts'],
-    transform: {
-      '^.+\\.ts$': 'ts-jest'
-    },
-    verbose: true
-  }
+  clearMocks: true,
+  moduleFileExtensions: ['js', 'ts'],
+  testMatch: ['**/*.test.ts'],
+  transform: {
+    '^.+\\.ts$': 'ts-jest'
+  },
+  verbose: true
+}