Add ESLint and Prettier

.eslintrc.yml

@@ -0,0 +1,13 @@
+root: true
+parser: '@typescript-eslint/parser'
+plugins: ['@typescript-eslint']
+extends:
+  - eslint:recommended
+  - plugin:@typescript-eslint/eslint-recommended
+  - plugin:@typescript-eslint/recommended
+  - prettier/@typescript-eslint
+rules:
+  # '@typescript-eslint/explicit-function-return-type': 0
+  '@typescript-eslint/no-use-before-define':
+    - 2
+    - functions: false

.prettierrc.yml

@@ -0,0 +1,5 @@
+arrowParens: avoid
+bracketSpacing: false
+semi: false
+singleQuote: true
+trailingComma: none

__test__/async-function.test.ts

@@ -1,8 +1,10 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
+
 import {callAsyncFunction} from '../src/async-function'
 
 describe('callAsyncFunction', () => {
   test('calls the function with its arguments', async () => {
-    const result = await callAsyncFunction({foo: 'bar'}, 'return foo')
+    const result = await callAsyncFunction({foo: 'bar'} as any, 'return foo')
     expect(result).toEqual('bar')
   })
 
@@ -10,17 +12,17 @@ describe('callAsyncFunction', () => {
     expect.assertions(1)
 
     try {
-      await callAsyncFunction({}, 'proces')
+      await callAsyncFunction({} as any, 'proces')
     } catch (err) {
       expect(err).toBeInstanceOf(ReferenceError)
     }
   })
 
   test('can access process', async () => {
-    await callAsyncFunction({}, 'process')
+    await callAsyncFunction({} as any, 'process')
   })
 
   test('can access console', async () => {
-    await callAsyncFunction({}, 'console')
+    await callAsyncFunction({} as any, 'console')
   })
 })

dist/index.js

@@ -9274,7 +9274,7 @@ var core = __webpack_require__(470);
 var lib_github = __webpack_require__(469);
 
 // CONCATENATED MODULE: ./src/async-function.ts
-const AsyncFunction = Object.getPrototypeOf(async () => { }).constructor;
+const AsyncFunction = Object.getPrototypeOf(async () => null).constructor;
 function callAsyncFunction(args, source) {
     const fn = new AsyncFunction(...Object.keys(args), source);
     return fn(...Object.values(args));
@@ -9300,7 +9300,7 @@ async function main() {
         opts.previews = previews.split(',');
     const github = new lib_github.GitHub(token, opts);
     const script = Object(core.getInput)('script', { required: true });
-    // Using property/value shorthand on `require` (e.g. `{require}`) causes compilatin errors.
+    // Using property/value shorthand on `require` (e.g. `{require}`) causes compilation errors.
     const result = await callAsyncFunction({ require: __webpack_require__(875), github, context: lib_github.context, core: core }, script);
     let encoding = Object(core.getInput)('result-encoding');
     encoding = encoding ? encoding : 'json';
@@ -9317,15 +9317,11 @@ async function main() {
     }
     Object(core.setOutput)('result', output);
 }
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
 function handleError(err) {
     console.error(err);
-    if (err && err.message) {
-        Object(core.setFailed)(err.message);
-    }
-    else {
     Object(core.setFailed)(`Unhandled error: ${err}`);
 }
-}
 
 
 /***/ }),

package.json

@@ -3,21 +3,20 @@
   "description": "A GitHub action for executing a simple script",
   "version": "0.9.0",
   "author": "GitHub",
-  "dependencies": {
-    "@actions/core": "^1.2.4",
-    "@actions/github": "^2.2.0"
-  },
-  "devDependencies": {
-    "@types/jest": "^25.1.4",
-    "@zeit/ncc": "^0.22.0",
-    "husky": "^4.2.3",
-    "jest": "^25.1.0",
-    "ts-jest": "^25.2.1",
-    "typescript": "^3.8.3"
+  "license": "MIT",
+  "main": "dist/index.js",
+  "private": true,
+  "scripts": {
+    "build": "ncc build src/main.ts",
+    "format": "prettier --write src __test__",
+    "lint": "eslint src __test__",
+    "check": "run-p --continue-on-error --aggregate-output format lint",
+    "pre-commit": "run-s check test build",
+    "test": "jest"
   },
   "husky": {
     "hooks": {
-      "pre-commit": "npm run build && git add dist/"
+      "pre-commit": "npm run pre-commit && git add dist/"
     }
   },
   "jest": {
@@ -33,11 +32,22 @@
       }
     }
   },
-  "license": "MIT",
-  "main": "dist/index.js",
-  "private": true,
-  "scripts": {
-    "build": "ncc build src/main.ts",
-    "test": "jest"
+  "dependencies": {
+    "@actions/core": "^1.2.4",
+    "@actions/github": "^2.2.0"
+  },
+  "devDependencies": {
+    "@types/jest": "^25.1.4",
+    "@typescript-eslint/eslint-plugin": "^2.33.0",
+    "@typescript-eslint/parser": "^2.33.0",
+    "@zeit/ncc": "^0.22.0",
+    "eslint": "^7.0.0",
+    "eslint-config-prettier": "^6.11.0",
+    "husky": "^4.2.5",
+    "jest": "^25.1.0",
+    "npm-run-all": "^4.1.5",
+    "prettier": "^2.0.5",
+    "ts-jest": "^25.2.1",
+    "typescript": "^3.8.3"
   }
 }

src/async-function.ts

@@ -1,11 +1,20 @@
-const AsyncFunction = Object.getPrototypeOf(async () => {}).constructor
+import * as core from '@actions/core'
+import {GitHub} from '@actions/github'
+import {Context} from '@actions/github/lib/context'
 
-type AsyncFunctionArguments = {[key: string]: any}
+const AsyncFunction = Object.getPrototypeOf(async () => null).constructor
 
-export function callAsyncFunction(
+type AsyncFunctionArguments = {
+  context: Context
+  core: typeof core
+  github: GitHub
+  require: NodeRequire
+}
+
+export function callAsyncFunction<T>(
   args: AsyncFunctionArguments,
   source: string
-): Promise<any> {
+): Promise<T> {
   const fn = new AsyncFunction(...Object.keys(args), source)
   return fn(...Object.values(args))
 }

src/main.ts

@@ -5,19 +5,27 @@ import {callAsyncFunction} from './async-function'
 process.on('unhandledRejection', handleError)
 main().catch(handleError)
 
-async function main() {
+type Options = {
+  log?: Console
+  userAgent?: string
+  previews?: string[]
+}
+
+async function main(): Promise<void> {
   const token = core.getInput('github-token', {required: true})
   const debug = core.getInput('debug')
   const userAgent = core.getInput('user-agent')
   const previews = core.getInput('previews')
-  const opts: {[key: string]: any} = {}
+
+  const opts: Options = {}
   if (debug === 'true') opts.log = console
   if (userAgent != null) opts.userAgent = userAgent
   if (previews != null) opts.previews = previews.split(',')
+
   const github = new GitHub(token, opts)
   const script = core.getInput('script', {required: true})
 
-  // Using property/value shorthand on `require` (e.g. `{require}`) causes compilatin errors.
+  // Using property/value shorthand on `require` (e.g. `{require}`) causes compilation errors.
   const result = await callAsyncFunction(
     {require: require, github, context, core},
     script
@@ -42,12 +50,8 @@ async function main() {
   core.setOutput('result', output)
 }
 
-function handleError(err: any) {
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+function handleError(err: any): void {
   console.error(err)
-
-  if (err && err.message) {
-    core.setFailed(err.message)
-  } else {
   core.setFailed(`Unhandled error: ${err}`)
 }
-}