microsoft / microsoft/TypeScript

Cannot mix both fixed and rest arguments using '.call' when using '--strictBindCallApply'

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Description

TypeScript Version: 3.9.0-dev.20200328

Search Terms: strict call rest arguments

Code

class C {
    use<A extends any[]>(fn: (this: this, obj: this, ...args: A) => void, ...args: A) {
        fn.bind(this, this)(...args); // ok
        fn.bind(this)(this, ...args); // error
        fn.call(this, this, ...args); // error
    }
}

Expected behavior:

The 2nd and 3rd cases above should be ok

Actual behavior:

The 2nd and 3rd cases above report errors.

Playground Link: Playground

Related Issues:

Contributor guide

Open the contributing guide

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 TypeScript reproduction in the issue body and run it with --strictBindCallApply enabled, focusing on the bind and call cases that combine fixed and rest arguments. The work is done when those cases type-check without errors while preserving the existing behavior of the first bind call.

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
Clearly specified
Newbie friendliness
38/100

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