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Improve is.infinite TypeScript type

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This commit is contained in:
Younho Choo 2022-01-17 20:21:21 +09:00
parent d2e65aa5b8
commit 7fbfce158e
2 changed files with 22 additions and 4 deletions
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18
source/types.ts
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@ -68,3 +68,21 @@ declare function setYear<T extends number>(length: Integer<T>): void;
// `${bigint}` is a type that matches a valid bigint literal without the `n` (ex. 1, 0b1, 0o1, 0x1)
// Because T is a number and not a string we can effectively use this to filter out any numbers containing decimal points
export type Integer<Type extends number> = `${Type}` extends `${bigint}` ? Type : never;
/**
Matches the hidden `Infinity` type.
Please upvote [this issue](https://github.com/microsoft/TypeScript/issues/32277) if you want to have this type as a built-in in TypeScript.
@see NegativeInfinity
@category Numeric
*/
// See https://github.com/microsoft/TypeScript/issues/31752
export type PositiveInfinity = 1e999;
/**
Matches the hidden `-Infinity` type.
Please upvote [this issue](https://github.com/microsoft/TypeScript/issues/32277) if you want to have this type as a built-in in TypeScript.
@see PositiveInfinity
@category Numeric
*/
// See https://github.com/microsoft/TypeScript/issues/31752
export type NegativeInfinity = -1e999;