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
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
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