Implement initial version

.eslintrc.json

@@ -0,0 +1,25 @@
+{
+  "root": true,
+  "env": {
+    "commonjs": true,
+    "es6": true,
+    "node": true,
+    "jest/globals": true
+  },
+  "extends": [
+    "airbnb-base",
+    "plugin:jest/all"
+  ],
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly"
+  },
+  "parserOptions": {
+    "ecmaVersion": 2018
+  },
+  "plugins": ["jest"],
+  "rules": {
+    "no-console": "off",
+    "quotes": ["error", "single", {"allowTemplateLiterals": true}]
+  }
+}

.github/workflows/build.yml

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+name: build
+on: [pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v1
+
+      - uses: actions/cache@v1
+        id: cache
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+
+      - name: Install
+        # if: steps.cache.outputs.cache-hit != 'true'
+        run: npm install
+
+      - name: Test
+        run: npm test
+
+      - name: Lint
+        run: npm run lint
+
+      - name: Monitor coverage
+        id: coverage-monitor
+        uses: ./
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          clover_file: "logs/clover.xml"

action.yml

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+name: 'Coverage monitor'
+description: 'A GitHub Action that monitor coverage.'
+inputs:
+  github_token:
+    description: "The GITHUB_TOKEN secret."
+    required: true
+  clover_file:
+    description: "Path to Clover XML file."
+    required: true
+  check:
+    description: "Whether check the coverage thresholds."
+    required: true
+    default: true
+  comment:
+    description: "Whether comment the coverage report."
+    required: true
+    default: true
+  threshold_alert:
+    description: "Mark the build as unstable when coverage is less than this threshold."
+    required: false
+    default: 50
+  threshold_warning:
+    description: "Warning when coverage is less than this threshold."
+    required: false
+    default: 90
+  status_context:
+    description: "A string label to differentiate this status from the status of other systems."
+    required: false
+    default: 'Coverage Report'
+runs:
+  using: 'node12'
+  main: 'dist/index.js'

build/build

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+#!/bin/sh
+
+change=$(git diff --name-only | grep "src.*\.js")
+
+if [[ -n ${change} ]]; then
+  npm run build
+fi