Add github actions

.github/workflows/nodejs.yml

@@ -0,0 +1,27 @@
+name: Node.js CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [22]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - run: npm install
+
+      - run: make eslint

eslint.config.js

@@ -0,0 +1,30 @@
+import js from '@eslint/js';
+import react from 'eslint-plugin-react';
+
+export default [
+    js.configs.recommended,
+    {
+        files: ['lib/**/*.js', 'lib/**/*.jsx'],
+        languageOptions: {
+            ecmaVersion: 2020,
+            sourceType: 'module',
+            parserOptions: {
+                ecmaFeatures: {
+                    jsx: true
+                }
+            }
+        },
+        plugins: {
+            react
+        },
+        rules: {
+            'no-console': 'off',
+            'react/jsx-uses-vars': 'error'
+        },
+        settings: {
+            react: {
+                version: 'detect'
+            }
+        }
+    }
+];

lib/demo.jsx

@@ -1,3 +1,5 @@
+/* global document */
+
 import React from 'react';
 import ReactDOM from 'react-dom';
 import MoonPhaseView from './MoonPhaseView';

lib/index.js

@@ -2,4 +2,4 @@
 
 import MoonPhaseView from './MoonPhaseView';
 
-module.exports = MoonPhaseView;
+export default MoonPhaseView;