Element.getElementsByTagName marked as deprecated

[mozesstumpf]

⚙ Compilation target

ESNext

⚙ Library

5.6.3

Missing / Incorrect Definition

Element.getElementsByTagName marked as deprecated if the Element is a union type

Sample Code

declare const el: HTMLDivElement;

// it's okay
el.getElementsByTagName;

declare const unionEl: HTMLDivElement | HTMLSpanElement;

// marked as deprecated
unionEl.getElementsByTagName;

Documentation Link

No response

[RyanCavanaugh]

I can't repro this

[mozesstumpf]

I can't repro this

Could you check on this repo?
https://github.com/mozesstumpf/getElementsByTagsName-issue

[snarbles2]

Just curious what you see when you go to the definition of this member. I couldn't reproduce it either, which makes sense given the declarations I'm seeing (5.6.3/ESNext).

    getElementsByTagName<K extends keyof HTMLElementTagNameMap>(qualifiedName: K): HTMLCollectionOf<HTMLElementTagNameMap[K]>;
    getElementsByTagName<K extends keyof SVGElementTagNameMap>(qualifiedName: K): HTMLCollectionOf<SVGElementTagNameMap[K]>;
    getElementsByTagName<K extends keyof MathMLElementTagNameMap>(qualifiedName: K): HTMLCollectionOf<MathMLElementTagNameMap[K]>;
    /** @deprecated */
    getElementsByTagName<K extends keyof HTMLElementDeprecatedTagNameMap>(qualifiedName: K): HTMLCollectionOf<HTMLElementDeprecatedTagNameMap[K]>;
    getElementsByTagName(qualifiedName: string): HTMLCollectionOf<Element>;

[nmain]

I can reproduce this readily in VSCode, but I'm not sure whether the error is VSCode, Typescript, or the plumbing between them.

In that setting, both quick info and go to definition show the first overload.