microsoft / microsoft/TypeScript
`Element.getElementsByTagName` marked as deprecated
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Description
### ⚙ Compilation target
ESNext
### ⚙ Library
5.6.3
### Missing / Incorrect Definition
`Element.getElementsByTagName` marked as deprecated if the `Element` is a union type
### Sample Code
```TypeScript
declare const el: HTMLDivElement;
// it's okay
el.getElementsByTagName;
declare const unionEl: HTMLDivElement | HTMLSpanElement;
// marked as deprecated
unionEl.getElementsByTagName;
```
### Documentation Link
_No response_
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Reproduce the ESNext example with TypeScript 5.6.3 and compare the single-element and union-element cases. Trace how deprecation is reported for Element.getElementsByTagName, then verify that the union case no longer receives an incorrect deprecation warning.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100