What did debug 4 introduce to make babel fails to polyfill IE 11?

[qiulang]

Hi,
This is a question.
So when I use version 3 I can use @babel/preset-env to polyfill IE 11.
But if I use version 4 polyfill fails for IE 11 I got SCRIPT1002

SCRIPT1002: Syntax error
chunk-vendors.js (25052,40) //which point to 

/**
 * Colorize log arguments if enabled.
 *
 * @api public
 */

args[0].replace(/%[a-zA-Z%]/g, match => {
		if (match === '%%') {
			return;
		}
		index++;

I try all the ways I can think of to polyfill version 4 but I still get this error.

[Qix-]

There's not enough information here to help you. This sounds like a Babel configuration problem, and that's not a typical Javascript syntax error that I've seen (plus it doesn't really say what the syntax error is).

[qiulang]

My babel config is rather simple

'@babel/preset-env',
{
	debug: true,
	targets: {
		chrome: '68',
		ie: '11',
		edge: '17',
		firefox: '68'
	},
	useBuiltIns: 'usage',
	corejs: 3
}

From here socketio/socket.io-client#1328 (comment)
it said

This happened after updating debug from v3 to v4 which uses spread operator in its distributable.
Very often node_modules are excluded from babel compilation for performance reasons.

I have tried to let babel polyfill & transpile v4 but without success. So I am asking for help.

[Qix-]

This isn't really the place to ask for Babel help, sorry. Our package doesn't do anything other packages don't do.

Try asking in the Babel slack channel, or opening an issue with babel (I don't know their support policies so please be mindful of them). I do not use Babel, therefore I cannot help you.

[qiulang]

I raised the issue to babel, according to them babel/babel#10707 (comment)

The error ReferenceError: exports is not defined is thrown from https://github.com/visionmedia/debug/blob/608fca962b34e2bda841db9a4416bab6b4a62803/src/browser.js#L7, which should be considered a bug of debug because browser does not ship CommonJS exports.

[Qix-]

Please see babel/babel#10707 (comment) for my response.