chore: set up eslint

.github/workflows/nodejs.yml

@@ -28,5 +28,8 @@ jobs:
       - name: Build
         run: pnpm build
 
+      - name: Lint
+        run: pnpm lint
+
       - name: Test
         run: pnpm test

eslint.config.js

@@ -0,0 +1,78 @@
+import { readFileSync } from 'node:fs'
+import eslint from '@eslint/js'
+import tseslint from 'typescript-eslint'
+import eslintPluginUnicorn from 'eslint-plugin-unicorn'
+import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended'
+
+const tsconfig = JSON.parse(readFileSync('./tsconfig.json', 'utf8'))
+
+export default defineConfig([
+  eslint.configs.recommended,
+  ...tseslint.configs.recommended,
+  ...tseslint.configs.recommendedTypeChecked.map((config) => ({
+    ...config,
+    files: tsconfig.include,
+  })),
+  {
+    files: tsconfig.include,
+    languageOptions: {
+      parserOptions: {
+        project: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+  {
+    languageOptions: {
+      globals: {
+        process: 'readonly',
+      },
+    },
+  },
+  {
+    plugins: { unicorn: eslintPluginUnicorn },
+    rules: { 'unicorn/prefer-node-protocol': 'error' },
+  },
+  {
+    // TODO: Must-have rules. Enable one-by-one
+    rules: {
+      'unicorn/prefer-node-protocol': 'off',
+      '@typescript-eslint/no-unused-vars': 'off',
+      '@typescript-eslint/require-await': 'off',
+      '@typescript-eslint/no-floating-promises': 'off',
+      '@typescript-eslint/no-misused-promises': 'off',
+      'no-constant-condition': 'off',
+      'no-empty': 'off',
+      'prefer-const': 'off',
+      '@typescript-eslint/ban-ts-comment': 'off',
+      '@typescript-eslint/ban-types': 'off',
+    },
+  },
+  {
+    // TODO: Nice-to-have rules
+    rules: {
+      '@typescript-eslint/no-unsafe-argument': 'off',
+      '@typescript-eslint/no-unsafe-assignment': 'off',
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-unsafe-member-access': 'off',
+      '@typescript-eslint/no-unsafe-return': 'off',
+      '@typescript-eslint/no-redundant-type-constituents': 'off',
+      '@typescript-eslint/no-unsafe-call': 'off',
+      '@typescript-eslint/no-unnecessary-type-assertion': 'off',
+      '@typescript-eslint/no-this-alias': 'off',
+      '@typescript-eslint/no-non-null-asserted-optional-chain': 'off',
+      '@typescript-eslint/no-namespace': 'off',
+      '@typescript-eslint/no-implied-eval': 'off',
+    },
+  },
+  { ignores: ['dist'] },
+  eslintPluginPrettierRecommended,
+
+  // TODO: Must-have rules. Enable one-by-one
+  { rules: { 'prettier/prettier': 'off' } },
+])
+
+/** @param config {import('eslint').Linter.FlatConfig} */
+function defineConfig(config) {
+  return config
+}

package.json

@@ -39,16 +39,22 @@
     "dev": "tsup --watch",
     "build": "tsup",
     "publish": "clean-publish",
-    "prepare": "husky install"
+    "prepare": "husky install",
+    "lint": "eslint"
   },
   "devDependencies": {
     "@types/node": "^20.12.8",
     "clean-publish": "^3.4.4",
+    "eslint": "^9.4.0",
+    "eslint-config-prettier": "^9.1.0",
+    "eslint-plugin-prettier": "^5.1.3",
+    "eslint-plugin-unicorn": "^53.0.0",
     "husky": "^7.0.4",
     "nano-staged": "^0.5.0",
-    "prettier": "^2.5.1",
+    "prettier": "^3.3.2",
     "tsup": "^8.0.2",
     "typescript": "^5.4.5",
+    "typescript-eslint": "^7.13.0",
     "vite": "^5.2.11",
     "vitest": "^1.6.0"
   },