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

@@ -1,26 +1,28 @@
+/* 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')
   })
 
   test('throws on ReferenceError', async () => {
     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';
@@ -9317,14 +9317,10 @@ 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}`);
-    }
+    Object(core.setFailed)(`Unhandled error: ${err}`);
 }