feat: initial release

.github/workflows/test-build-publish.yml

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+name: Test, Build, and Publish
+
+on:
+  workflow_dispatch:
+  push:
+
+permissions:
+  contents: write
+  issues: write
+  pull-requests: write
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 'lts/*'
+      - name: Install dependencies
+        run: npm ci
+      - name: Run tests
+        run: npm test
+  build:
+    runs-on: ubuntu-latest
+    needs: test
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 'lts/*'
+      - name: Install dependencies
+        run: npm ci
+      - name: Audit signatures
+        run: npm audit signatures
+      - name: Build library
+        run: npm run build
+      - name: Prepare artifact
+        run: |
+          mkdir -p ./lib/lib &&
+          find ./lib -mindepth 1 -maxdepth 1 ! -name "lib" -exec mv {} ./lib/lib/ \;
+          cp package.json README.md LICENSE ./lib
+      - uses: actions/upload-artifact@v4
+        with:
+          name: lib
+          path: ./lib
+  publish:
+    runs-on: ubuntu-latest
+    needs: build
+    if: github.ref == 'refs/heads/main'
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 'lts/*'
+      - uses: actions/download-artifact@v4
+        with:
+          name: lib
+      - name: Publish library
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
+        run: |
+          cd ./lib &&
+          npx semantic-release

.gitignore

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+node_modules/
+lib/
+coverage/

.nvmrc

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+v20.18.0

README.md

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+# `Symbol.metadata` Polyfill
+
+`@tsmetadata/polyfill` provides the necessary polyfill for legacy runtimes to properly use decorator metadata in TypeScript 5.2+.
+
+In addition, the library provides the necessary global type declaration for `Symbol.metadata`.
+
+- [🌱 Install](#-install)
+- [⚙️ Usage](#️-usage)
+- [🙏 Thanks](#-thanks)
+
+## 🌱 Install
+```bash
+# `@tsmetadata/polyfill` is intended to be installed as a dev dependency.
+npm install -D @tsmetadata/polyfill
+```
+
+## ⚙️ Usage
+As early as possible, import the polyfill.
+```typescript
+import '@tsmetadata/polyfill';
+```
+
+After doing so, `Symbol.metadata` will be defined.
+
+## 🙏 Thanks
+
+Special thanks to Oleksandr Tarasiuk for implementing decorator metadata and to Andrew Branch for releasing an early version of this polyfill.

__tests__/index.test.ts

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+import '../src';
+
+describe('polyfill', () => {
+  describe('`Symbol.metadata`', () => {
+    it('should be defined', () => {
+      expect(Object.hasOwn(Symbol, 'metadata')).toBe(true);
+    });
+
+    it('should be of type symbol', () => {
+      expect(typeof Symbol.metadata).toBe('symbol');
+    });
+
+    it("should be named 'Symbol.metadata'", () => {
+      expect(Symbol.metadata.toString()).toBe('Symbol(Symbol.metadata)');
+    });
+  });
+});

biome.json

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+{
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 80,
+    "lineEnding": "lf"
+  },
+  "javascript": {
+    "formatter": {
+      "arrowParentheses": "always",
+      "bracketSameLine": true,
+      "bracketSpacing": true,
+      "quoteStyle": "single",
+      "quoteProperties": "asNeeded",
+      "semicolons": "always",
+      "trailingCommas": "all"
+    }
+  },
+  "json": {
+    "formatter": {
+      "trailingCommas": "none"
+    }
+  },
+  "files": {
+    "ignore": ["./coverage"]
+  }
+}

jest.config.ts

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+import type { Config } from 'jest';
+
+const config: Config = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  coverageThreshold: {
+    global: {
+      branches: 100,
+      functions: 100,
+      lines: 100,
+      statements: 100,
+    },
+  },
+  transform: {
+    '^.+\\.ts?$': [
+      'ts-jest',
+      {
+        diagnostics: false,
+      },
+    ],
+  },
+};
+
+export default config;