"Error: 'return' outside of function" with async/await

Current Behavior

Hello! Thank you for making this awesome tool.

By the way, an error occurred while testing to set up the project using this tool.

const puppeteer = require('puppeteer')
;(async () => {
  const browser = await puppeteer.launch()
  const page = await browser.newPage()
  await page.goto('https://example.com')
  await page.screenshot({ path: 'example.png' })

  await browser.close()
})()

Error: 'return' outside of function (Note that you need plugins to import files that are not JavaScript)

at /Users/seungdols/dev/getGold/src/index.ts:3:24

1: const puppeteer = require('puppeteer')
2: ;(async () => {
3:   const browser = await puppeteer.launch()
                           ^
4:   const page = await browser.newPage()
5:   await page.goto('https://example.com')

Expected behavior

If you build using tsc, it is a code that builds normally.

Why this error message?

I can’t build a module of puppeteer example code.

I would like to know why the error occurs in a simple async/await code.

And I couldn’t understand exactly what the error message was saying, so I had to ask a question.

What exactly did I do wrong with this error message? I don’t know, can you change the message a little more kindly?

And can you guide me on how to solve this problem?

Your environment

OSX 10.15.6
Node 12.16.3

[seungdols]

@agilgur5 Thank you for explaining in detail.

Actually, I tried to find this bug, but I still don’t understand the structure of the project, but you solved it.

Thanks to the kind explanation, it was an opportunity to understand the project more. It was really good for teaching.

thank you.😁

[agilgur5]

async-to-promises has been replaced with babel-plugin-polyfill-regenerator in #795 and will be released in v0.14.0 soon. It will only pure polyfill generators for targets that need a polyfill according to your browserslistrc or preset-env targets.

For your specific purpose, since puppeteer runs in Node, I would recommend adding a .browserslistrc:

node 10