[Docs]: Uploading file that does not exist does not produce any error

[Akxe]

Bug expectation

I expected an error but did not get one. I did waste half a day on it (I am not mad, it is only really hard to tell if something went wrong...)

Bug behavior

• Flaky
• PDF

Minimal, reproducible example

import puppeteer from 'puppeteer';

(async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();
  await page.setContent('<input type="file">')
  const inputHandle = await page.$('input[type=file]');
  await inputHandle.uploadFile('non-existing-src.jpg');
})();

Error string

no error

Puppeteer configuration

I am using `jest-pupeteer` with `.jest-puppeteerrc.json` file: 


{
  "launch": {
    "headless": true,
    "devtools": true,
    "exitOnPageError": false
  }
}

Puppeteer version

19.10.0

Node version

16.13.2

Package manager

npm

Package manager version

9.1.2

Operating system

Windows

[github-actions]

This issue has an outdated Puppeteer version: 19.10.0. Please verify your issue on the latest 19.10.1 version. Then update the form accordingly.

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Analyzer run

[jrandolf-2]

Sorry about this. We used to validate, but now we don't because the file comes from your remote environment which is not possible to validate. This sadly implies if your remote is your local, then we still can't validate because we can't detect that difference.

Under the hood, the input element doesn't validate what gets set there, it's assumed that you validated beforehand, so it's best to somehow validate the file before using your own framework (if it's local, then just use fs.existsSync) and then continuing on from there.

[Akxe]

How about an update to the docs of uploadFile? Maybe a hint that the file is not validated could be helpful?