Incorrect quick fix for undeclared private field in javascript files

[mjbvz]

TypeScript Version: 3.8.0-dev.20200108

Search Terms:

Code

For a js file

//@ts-check

class Private {
    constructor(name) {
        this.#name = name;
    }
}

Trigger the initialize property name quick fix

Expected behavior:
Initializer added in class:

//@ts-check

class Private {
    #name;
    
    constructor(name) {
        this.#name = name;
    }
}

Actual behavior:
Initializer added in the ctor:

//@ts-check

class Private {
    constructor(name) {
        this.#name = name;
        this.#name = undefined;
    }
}

Playground Link:

Related Issues:

• No error for undeclared #private property in .js files #35962