Use TypeScript

src/main.ts

@@ -0,0 +1,49 @@
+import * as core from '@actions/core'
+import {context, GitHub} from '@actions/github'
+
+process.on('unhandledRejection', handleError)
+main().catch(handleError)
+
+async function main() {
+  const AsyncFunction = Object.getPrototypeOf(async () => {}).constructor
+  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} = {}
+  if (debug === 'true') opts.log = console
+  if (userAgent != null) opts.userAgent = userAgent
+  if (previews != null) opts.previews = previews.split(',')
+  const client = new GitHub(token, opts)
+  const script = core.getInput('script', {required: true})
+  const fn = new AsyncFunction('require', 'github', 'context', script)
+  const result = await fn(require, client, context)
+
+  let encoding = core.getInput('result-encoding')
+  encoding = encoding ? encoding : 'json'
+
+  let output
+
+  switch (encoding) {
+    case 'json':
+      output = JSON.stringify(result)
+      break
+    case 'string':
+      output = String(result)
+      break
+    default:
+      throw new Error('"result-encoding" must be either "string" or "json"')
+  }
+
+  core.setOutput('result', output)
+}
+
+function handleError(err: any) {
+  console.error(err)
+
+  if (err && err.message) {
+    core.setFailed(err.message)
+  } else {
+    core.setFailed(`Unhandled error: ${err}`)
+  }
+}