run function to handle GitHub Action main and post runs

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

README.md

@@ -39,7 +39,7 @@ $ npm install @docker/actions-toolkit
 ## Usage
 
 ```js
-const { Toolkit } = require('@docker/actions-toolkit')
+const { Toolkit } = require('@docker/actions-toolkit/lib/toolkit')
 const toolkit = new Toolkit()
 ```
 

jest.config.ts

@@ -41,7 +41,7 @@ module.exports = {
   moduleNameMapper: {
     '^csv-parse/sync': '<rootDir>/node_modules/csv-parse/dist/cjs/sync.cjs'
   },
-  collectCoverageFrom: ['src/**/{!(toolkit.ts),}.ts'],
+  collectCoverageFrom: ['src/**/{!(index.ts),}.ts'],
   coveragePathIgnorePatterns: ['lib/', 'node_modules/', '__mocks__/', '__tests__/'],
   verbose: true
 };

package.json

@@ -28,8 +28,8 @@
   "author": "Docker Inc.",
   "license": "Apache-2.0",
   "packageManager": "yarn@3.3.1",
-  "main": "lib/toolkit.js",
+  "main": "lib/index.js",
-  "types": "lib/toolkit.d.ts",
+  "types": "lib/index.d.ts",
   "directories": {
     "lib": "lib",
     "test": "__tests__"

src/index.ts

@@ -0,0 +1,42 @@
+/**
+ * Copyright 2023 actions-toolkit authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import * as core from '@actions/core';
+
+const isPost = !!process.env['STATE_isPost'];
+if (!isPost) {
+  core.saveState('isPost', 'true');
+}
+
+/**
+ * Runs a GitHub Action.
+ * Output will be streamed to the live console.
+ *
+ * @param     main            runs the defined function.
+ * @param     post            runs the defined function at the end of the job if set.
+ * @returns   Promise<void>
+ */
+export async function run(main: () => Promise<void>, post?: () => Promise<void>): Promise<void> {
+  if (!isPost) {
+    try {
+      await main();
+    } catch (e) {
+      core.setFailed(e.message);
+    }
+  } else if (post) {
+    await post();
+  }
+}