microsoft / microsoft/TypeScript

Decorated private propoerty flagged as unused with `noUnusedLocals:true`

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Description

noUnusedLocals:true

import { Component } from '@angular/core';

@Component({
  selector: 'my-component',
  template: `
    {{text}}
  `,
})
export class MyComponent {
  @Input()
  private text: string;//'text' is declared but never used
}

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the minimal Angular example in the issue and run it with noUnusedLocals enabled to reproduce the diagnostic on the decorated private property. Trace the TypeScript compiler's unused-local analysis for decorators and private class members; done means the example no longer reports text as unused while genuinely unused locals remain flagged.

Written by the indexing model from the issue text.

Assessment

Tech stack
angular, typescript
Domain
compilers
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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