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feat(typescript-types): Add If<Test,TrueBranch,FalseBranch>

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T. R. Bernstein
2025-07-13 03:06:29 +02:00
parent afe7bee342
commit 319ccac8a7
3 changed files with 31 additions and 4 deletions
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packages/typescript-types/README.md
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@@ -8,10 +8,14 @@ The types included in this library are categorized by their purpose.
#### Test Types
| Type | Description |
| ---------------- | ------------------------------------------------------------------------------------------- |
| [`IsAny<T>`][] | `true` if `T` is `any`, `false` otherwise (`null`, `undefined` also yield `false`) |
| [`IsNever<T>`][] | `true` if `T` is `never`, `false` otherwise (`null`, `undefined`, `any` also yield `false`) |
| Type | Description |
| --------------------------------------- | ------------------------------------------------------------------------------------------- |
| [`IsAny<T>`][] | `true` if `T` is `any`, `false` otherwise (`null`, `undefined` also yield `false`) |
| [`IsNever<T>`][] | `true` if `T` is `never`, `false` otherwise (`null`, `undefined`, `any` also yield `false`) |
| [`If<Test, TrueBranch, FalseBranch>`][] | Returns `TrueBranch` if `Test` is `true`, `FalseBranch` otherwise[^if_remark]. |
[^if_remark]: Note the special behavior, if `boolean` is passed as `Test` the return value is a union of both branches, i.e. `TrueBranch | FalseBranch`.
[`IsAny<T>`]: src/is-any.ts
[`IsNever<T>`]: src/is-never.ts
[`If<Test, TrueBranch, FalseBranch>`]: src/if.ts