Add coverage report workflow

.github/workflows/collect-coverage.yml

@@ -0,0 +1,17 @@
+name: ci
+on: [push]
+jobs:
+  update-code-coverage-badge:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
+        with:
+          node-version: "18"
+      - name: Install
+        run: |
+          yarn
+      - name: Test and collect coverage
+        run: yarn test-coverage
+      - name: Create badge and publish to gh-pages
+        uses: nolleh/jest-badge-deploy-action@latest

jest.config.js

@@ -1,3 +1,4 @@
+/** @type {import('jest').Config} */
 const config = {
   resetMocks: true,
   resetModules: true,
@@ -12,7 +13,14 @@ const config = {
     './jest.setup-after-env.js',
     'jest-extended/all'
   ],
-  testEnvironment: 'jsdom'
+  testEnvironment: 'jsdom',
+  coveragePathIgnorePatterns: ['/node_modules/', '/tests/'],
+  coverageReporters: ["json-summary", "text"],
+  collectCoverageFrom: [
+    'src/**/*.{ts,tsx}',
+    '!dist/**',
+  ],
+  collectCoverage: true,
 };
 
 module.exports = config;

package.json

@@ -7,7 +7,8 @@
     "lint": "npx eslint src transformers test --ignore-pattern '*.d.ts' --ext .ts,.tsx,.js",
     "build-local": "tsc --project tsconfig.json",
     "pretest": "tsc --project tsconfig.json",
-    "test": "npx jest"
+    "test": "npx jest",
+    "test-coverage": "npx jest --coverage"
   },
   "main": "dist/src/index.js",
   "directories": {