microsoft / microsoft/TypeScript
Expose type level api
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Suggestion
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Description
Search Terms
plugin, type, intrinsic, api
Suggestion
Now we have intrinsic type for template literal type.
- Uppercase
- Lowercase
- Capitalize
- Uncapitalize
Could we release the type level api for customize the behavior of type?
Use Cases
For example
type ToNumber<T extends string> = intrinsic
type Plus<T extends number, U extends number> = intrinsic
Related:
- #26382
- #16607
Checklist
My suggestion meets these guidelines:
- This wouldn't be a breaking change in existing TypeScript/JavaScript code
- This wouldn't change the runtime behavior of existing JavaScript code
- This could be implemented without emitting different JS based on the types of the expressions
- This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
- This feature would agree with the rest of TypeScript's Design Goals.
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
No implementation files, tests, or entry points are named. Start by reading the proposal and related issues #26382 and #16607, then determine the design and scope of a public type-level API for custom intrinsic types; done would require an agreed specification and implementation plan.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100