build: configure typescript

.gitignore

@@ -0,0 +1 @@
+node_modules

babel-register.js

@@ -0,0 +1,5 @@
+'use strict';
+
+require('@babel/register')({
+  extensions: ['.js', '.ts', '.tsx'],
+});

babel.config.js

@@ -0,0 +1,21 @@
+'use strict';
+
+module.exports = function (api) {
+  api.cache(true);
+
+  const config = {
+    comments: true,
+    presets: [
+      '@babel/preset-typescript',
+      [
+        '@babel/preset-env',
+        {
+          targets: {node: true},
+        },
+      ],
+    ],
+    sourceMaps: true,
+  };
+
+  return config;
+};

index.js

@@ -1 +1,4 @@
-console.log('It works!');
+'use strict';
+
+require('./babel-register')
+require('./src/index');

package.json

@@ -16,5 +16,14 @@
   "bugs": {
     "url": "https://github.com/check-run-reporter/action/issues"
   },
-  "homepage": "https://www.check-run-reporter.com"
+  "homepage": "https://www.check-run-reporter.com",
+  "devDependencies": {
+    "typescript": "^3.9.7"
+  },
+  "dependencies": {
+    "@babel/core": "^7.11.1",
+    "@babel/preset-env": "^7.11.0",
+    "@babel/preset-typescript": "^7.10.4",
+    "@babel/register": "^7.10.5"
+  }
 }

src/index.ts

@@ -0,0 +1 @@
+console.log('It works!');

tsconfig.json

@@ -0,0 +1,13 @@
+{
+  "compilerOptions": {
+    "esModuleInterop": true,
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "noEmit": true,
+    "strict": true,
+    "target": "es2019"
+  },
+  "include": [
+    "src/**/*.ts"
+  ]
+}