electron: [Bug]: Typing in Devtools causes crashes (onerror handler is hit)

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

Electron Version

19.0.0

What operating system are you using?

Windows

Operating System Version

Windows 10

What arch are you using?

x64

Last Known Working Electron version

18.3.0

Expected Behavior

I should be able to type in the devtools without triggering the window’s onerror handler.

Actual Behavior

onerror is triggered with the error: “Possible side-effect in debug-evaluate”

Testcase Gist URL

https://gist.github.com/54d5f29ef2094fe21e5ba6b2de4ca876

Additional Information

1. start app
2. type something in devtools
3. observe the error popup

Here’s the code I’m running:

main.js:

const {app, BrowserWindow} = require('electron')

async function createWindow () {
  const mainWindow = new BrowserWindow()
  await mainWindow.loadFile('index.html')
  mainWindow.webContents.openDevTools()
}

app.whenReady().then(() => {
  createWindow()
})

app.on('window-all-closed', function () {
  if (process.platform !== 'darwin') app.quit()
})

index.html:

<script src="./renderer.js"></script>

renderer.js:

window.onerror = (e, url, line, col, error) => {
  alert(error.message);
};