useDefineForClassFields produces broken code

[fregante]

I can't reproduce online but here's the repro.

Bug: microsoft/TypeScript#35590
Also related: microsoft/TypeScript#35426

Input

{
	"compilerOptions": {
		"target": "es2017",
		"useDefineForClassFields": true
	}
}

export default class {
	private _form!: HTMLFormElement;
	constructor() {
		console.log(this._form)
	}
}

Output

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
class default_1 {
    constructor() {
        Object.defineProperty(this, "_form", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: _form ///////////////// WRONG
        });
        console.log(this._form);
    }
}
exports.default = default_1;

Online that value is correctly set to void 0 instead of an undefined variable.

[fatcerberus]

I can't reproduce online

The bug was introduced in 3.7.3. The Playground is currently on 3.7.2; you can reproduce if you switch the Playground to Nightly.

[sindresorhus]

Ugh. Yeah, let's just disable it for now.