In an anonymous class, accessing `static` `class` property in instance method via `this.constructor` is reported as an error (is not an error) [Javascript, but TypeScript checking it]

🔎 Search Terms

"class" AND "private" AND ("field" OR "property") AND ("must be declared in an enclosing class" OR "does not exist on type Function") AND "static" AND "this.constructor" AND "private" AND -label:Suggestion

Relevant bugs:

3841
32452

🕗 Version & Regression Information

The problem exists on the oldest (3.3.3333) and the newest (Nightly, v5.8.0-dev.20241107) of the Playground.
I reviewed the FAQ and couldn't find anything related to it.

⏯ Playground Link

https://www.typescriptlang.org/play/?filetype=js#code/MYewdgzgLgBA5gUygYQDYEMIRgXhgCgEpcA+AKBkpmAyxgHoAqGAQTHAE8BbEAV2xqZsjejADeFKlOjooAS2AwAxIKwAFAE5yAbrIS4YARgBMAZgDcZSVMoz5ixCloRNOvUXHWbUjUl4awGCgACzkIADoVZ1ddKARLb0oAXytE+CQ0IRi9AFUIOTA4AElIKHQwYAQAWSRgkAATDwk0nz8AoNCI0FKNXmAoEA1I1RctWPivKRSpq27oGGQAGRYAZRWDR0ysIksyOZBUBHDUEDh8GABycM3osfdiHBwLgBoF5bXrjNu3OI9CS32h2OpwIVxuWTucTyBWKpXKlRqIQaHkeLwIYAQAHc3qsVkRCJ8nBCfghoYUSjIKtVasjiP8yEA

💻 Code

const getClass = () =>
    class /* Anonymous class */ {
        static #classPrivate = 123;

        static getClassPrivate() {
            return this.#classPrivate;
        }

        getClassPrivateUsingInstanceMethod() {
            return this.constructor.#classPrivate;
        }
    }

const CLASS = getClass();

console.log( '.getClassPrivate() ==', CLASS.getClassPrivate() );
console.log ('.getClassPrivateUsingInstanceMethod() ==', (new CLASS()).getClassPrivateUsingInstanceMethod() );

Running the above code works. Logs:

[LOG]: ".getClassPrivate() ==",  123 
[LOG]: ".getClassPrivateUsingInstanceMethod() ==",  123

🙁 Actual behavior

TypeScript checker says there are errors in the code.

Errors in code

    Property '#classPrivate' does not exist on type 'Function'.

🙂 Expected behavior

No errors from TypeScript checker.

Additional information about the issue

The problem goes away when adding // @ts-ignore above the erroring line.

Except

when using VSCode¹ locally, the ts-ignore directive does nothing. If I add // @ts-check at the top of the file, the ts-ignore directive works as expected.

¹ (built-in TypeScript version 5.6.3, Restricted Mode)

microsoft / TypeScript