Add ESLint and Prettier

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))
 }