Expose type level api

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.

Non vengono indicati file di implementazione, test o punti di ingresso. Inizia leggendo la proposta e le issue correlate #26382 e #16607, quindi determina il design e l’ambito di una API pubblica a livello di tipo per i tipi intrinseci personalizzati; il lavoro sarebbe completato quando fossero disponibili una specifica concordata e un piano di implementazione.