microsoft / microsoft/TypeScript
lib.es*.d.ts: constructor methods
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Description
lib Update Request
Configuration Check
My compilation target is ES2015 and my lib is the default.
Missing / Incorrect Definition
Array and other interfaces for built-ins do not declare their own constructor methods
Sample Code
[].constructor[Symbol.species];
Element implicitly has an 'any' type because expression of type 'unique symbol' can't be used to index type 'Function'.
Property '[SymbolConstructor.species]' does not exist on type 'Function'.
The code compiles fine when defining the appropriate constructor method:
declare global {
interface Array<T> {
constructor: ArrayConstructor;
}
}
Documentation Link
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/constructor
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 relevant lib.es*.d.ts declarations and reproduce the reported [].constructor[Symbol.species] error using the supplied sample or Playground link. Check the built-in interfaces described in the issue and ensure the constructor definitions support this access pattern; the sample should compile without the reported error when the work is done.
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