feat: enhance GitHub Action with improved input handling and default configurations

- Added a bundling script to package.json using ncc.
- Introduced new linting and formatting scripts in package.json.
- Refactored input handling in src/index.ts to use helper functions for boolean inputs and default paths.
- Created unit tests for the run function in tests/index.test.ts to validate default and provided configurations.
- Added vitest configuration for testing environment and coverage.

Author: CasperKristiansson

.prettierignore

@@ -0,0 +1,3 @@
+dist
+node_modules
+coverage

.prettierrc.json

@@ -0,0 +1,6 @@
+{
+  "singleQuote": true,
+  "trailingComma": "all",
+  "printWidth": 100,
+  "semi": true
+}

action.yml

@@ -5,11 +5,11 @@ inputs:
   track:
     description: CPython minor series to track (for example 3.13).
     required: false
-    default: "3.13"
+    default: '3.13'
   include_prerelease:
     description: Include pre-release tags when resolving the latest patch version.
     required: false
-    default: "false"
+    default: 'false'
   paths:
     description: Newline-separated glob patterns that determine which files to scan for pinned Python versions.
     required: false
@@ -23,11 +23,11 @@ inputs:
   automerge:
     description: Attempt to automerge the pull request after required checks succeed.
     required: false
-    default: "false"
+    default: 'false'
   dry_run:
     description: Skip file modifications and output the planned changes only.
     required: false
-    default: "false"
+    default: 'false'
 outputs:
   new_version:
     description: Resolved CPython patch version (for example 3.13.5).

docs/tasks.md

@@ -79,7 +79,7 @@ Use Context7 MCP for up to date documentation.
        Outputs: `new_version`, `files_changed`, `skipped_reason`. `runs: node20`.
        Verify: `actionlint` passes on sample workflow.
 
-4. [ ] **Add dev tooling**
+4. [x] **Add dev tooling**
        Install `eslint`, `prettier`, `vitest`, `@types/node`, `@vercel/ncc`, `actionlint`.
        Verify: `npm run lint` and `npm run test` pass.
 

eslint.config.mjs

@@ -0,0 +1,41 @@
+import js from '@eslint/js';
+import tsPlugin from '@typescript-eslint/eslint-plugin';
+import tsParser from '@typescript-eslint/parser';
+import prettierPlugin from 'eslint-plugin-prettier';
+import prettierRecommended from 'eslint-plugin-prettier/recommended';
+
+export default [
+  {
+    ignores: ['dist', 'node_modules', 'coverage'],
+  },
+  js.configs.recommended,
+  {
+    files: ['**/*.ts'],
+    languageOptions: {
+      parser: tsParser,
+      parserOptions: {
+        sourceType: 'module',
+      },
+      globals: {
+        require: 'readonly',
+        module: 'readonly',
+      },
+    },
+    plugins: {
+      '@typescript-eslint': tsPlugin,
+      prettier: prettierPlugin,
+    },
+    rules: {
+      ...tsPlugin.configs.recommended.rules,
+      '@typescript-eslint/explicit-function-return-type': [
+        'error',
+        {
+          allowExpressions: true,
+          allowTypedFunctionExpressions: true,
+        },
+      ],
+      'prettier/prettier': 'error',
+    },
+  },
+  prettierRecommended,
+];