chore: fix ESLint errors and type-check all files

- Add void operator to run() call to fix floating promise
- Add eslint-disable comment for intentional non-Error throw test
- Remove unnecessary conditionals in utils.ts
- Create tsconfig.eslint.json for type-aware linting
- Update lint:tsc to type-check all files including configs
- Rename eslint.config.mjs to eslint.config.mts

Author: remarkablemark

dist/index.js

@@ -1,8 +1,7 @@
 import { fileURLToPath } from 'node:url';
 
-import { includeIgnoreFile } from '@eslint/compat';
-import eslint from '@eslint/js';
-import { defineConfig } from 'eslint/config';
+import js from '@eslint/js';
+import { defineConfig, includeIgnoreFile } from 'eslint/config';
 import prettier from 'eslint-plugin-prettier';
 import simpleImportSort from 'eslint-plugin-simple-import-sort';
 import tsdoc from 'eslint-plugin-tsdoc';
@@ -23,17 +22,27 @@ export default defineConfig([
 
     plugins: {
       'simple-import-sort': simpleImportSort,
-      eslint,
+      js,
       prettier,
       tsdoc,
     },
 
-    extends: [eslint.configs.recommended, tseslint.configs.recommended],
+    extends: [
+      js.configs.recommended,
+      tseslint.configs.recommended,
+      tseslint.configs.recommendedTypeChecked,
+      tseslint.configs.strictTypeChecked,
+      tseslint.configs.stylisticTypeChecked,
+    ],
 
     languageOptions: {
       globals: {
         ...globals.node,
-        ...globals.jest,
+        ...globals.vitest,
+      },
+      parserOptions: {
+        project: ['tsconfig.eslint.json'],
+        tsconfigRootDir: import.meta.dirname,
       },
     },
 

eslint.config.mjs eslint.config.mtseslint.config.mjs renamed to eslint.config.mts

@@ -10,7 +10,7 @@
     "clean": "rm -rf coverage dist",
     "lint": "eslint .",
     "lint:fix": "npm run lint -- --fix",
-    "lint:tsc": "tsc --noEmit",
+    "lint:tsc": "tsc -p tsconfig.eslint.json",
     "prepare": "husky",
     "test": "vitest run",
     "test:ci": "CI=true npm test -- --color --coverage",
@@ -24,7 +24,6 @@
   "devDependencies": {
     "@commitlint/cli": "21.0.2",
     "@commitlint/config-conventional": "21.0.2",
-    "@eslint/compat": "2.1.0",
     "@eslint/eslintrc": "3.3.5",
     "@eslint/js": "10.0.1",
     "@types/node": "25.9.1",

package-lock.json

@@ -32,7 +32,7 @@ const platforms = ['darwin', 'win32', 'linux'];
 describe.each(platforms)('when platform is %s', (platform) => {
   beforeEach(() => {
     mockedOs.platform.mockReturnValue(platform as NodeJS.Platform);
-    mockedOs.arch.mockReturnValue('arm64' as NodeJS.Architecture);
+    mockedOs.arch.mockReturnValue('arm64');
 
     mockedCore.getInput.mockImplementation((input) => {
       switch (input) {
@@ -92,6 +92,7 @@ describe('error', () => {
 
   it('throws non-error', async () => {
     mockedCore.getInput.mockImplementationOnce(() => {
+      // eslint-disable-next-line @typescript-eslint/only-throw-error
       throw 'string error';
     });
     await run();

package.json

@@ -64,4 +64,4 @@ export async function run() {
   }
 }
 
-run();
+void run();

src/index.test.ts

@@ -10,14 +10,14 @@ import { getBinaryPath, getDownloadObject } from './utils.js';
 const platforms: NodeJS.Platform[] = ['darwin', 'linux', 'win32'];
 const architectures = ['arm', 'x32', 'x64'] as NodeJS.Architecture[];
 
-const table = platforms.reduce(
+const table = platforms.reduce<[NodeJS.Platform, NodeJS.Architecture][]>(
   (testSuites, platform) => [
     ...testSuites,
     ...architectures.map(
       (arch) => [platform, arch] as [NodeJS.Platform, NodeJS.Architecture],
     ),
   ],
-  [] as [NodeJS.Platform, NodeJS.Architecture][],
+  [],
 );
 
 describe('getDownloadObject', () => {

src/index.ts

@@ -17,7 +17,7 @@ enum Architecture {
  * @returns - Return value in [arm, arm64, 386, amd64]
  */
 function getArch(arch: NodeJS.Architecture) {
-  return Architecture[arch as keyof typeof Architecture] || arch;
+  return Architecture[arch as keyof typeof Architecture];
 }
 
 enum Platform {
@@ -35,7 +35,7 @@ enum Platform {
  * @returns - Return value in [macOS, linux, windows]
  */
 function getOS(os: NodeJS.Platform) {
-  return Platform[os as keyof typeof Platform] || os;
+  return Platform[os as keyof typeof Platform];
 }
 
 /**
@@ -48,7 +48,7 @@ function getOS(os: NodeJS.Platform) {
  */
 export function getDownloadObject(version: string) {
   const os = platform();
-  const architecture = arch() as NodeJS.Architecture;
+  const architecture = arch();
 
   const filename = `gh_${version}_${getOS(os)}_${getArch(architecture)}`;
   const extension = os === 'win32' ? 'zip' : 'tar.gz';

src/utils.test.ts

@@ -0,0 +1,8 @@
+{
+  "extends": "./tsconfig.json",
+  "compilerOptions": {
+    "skipLibCheck": true,
+    "noEmit": true
+  },
+  "include": ["src", "*.config.ts", "*.config.mts", "eslint.config.mts"]
+}