test: add jest

.github/workflows/build.yml

@@ -0,0 +1,37 @@
+name: build
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Install Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 16
+          cache: npm
+
+      - name: Install Package
+        run: npm ci
+
+      - name: Build Package
+        run: npm run build
+
+      - name: Test Package
+        run: npm run test
+
+      - name: Upload coverage reports to Codecov
+        uses: codecov/codecov-action@v4
+        with:
+          verbose: true
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}

babel.config.js

@@ -11,9 +11,10 @@ const presets = [
         'maintained node versions',
         'not dead',
         'safari >= 7'
-      ],
-    },
+      ]
+    }
   ],
+  '@babel/preset-typescript'
 ]
 
 const plugins = [

jest.config.js

@@ -0,0 +1,8 @@
+/** @type {import('ts-jest').JestConfigWithTsJest} */
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  collectCoverage: true,
+  coverageDirectory: 'coverage',
+  coverageReporters: ['json', 'lcov', 'text', 'clover']
+}