60 lines
2.1 KiB
TypeScript
60 lines
2.1 KiB
TypeScript
import type {Primitive} from './primitive';
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/**
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Returns a boolean for whether the two given types are equal.
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@link https://github.com/microsoft/TypeScript/issues/27024#issuecomment-421529650
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@link https://stackoverflow.com/questions/68961864/how-does-the-equals-work-in-typescript/68963796#68963796
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*/
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export type IsEqual<T, U> =
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(<G>() => G extends T ? 1 : 2) extends
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(<G>() => G extends U ? 1 : 2)
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? true
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: false;
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/**
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Infer the length of the given array `<T>`.
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@link https://itnext.io/implementing-arithmetic-within-typescripts-type-system-a1ef140a6f6f
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*/
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type TupleLength<T extends readonly unknown[]> = T extends {readonly length: infer L} ? L : never;
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/**
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Create a tuple type of the given length `<L>`.
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@link https://itnext.io/implementing-arithmetic-within-typescripts-type-system-a1ef140a6f6f
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*/
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type BuildTuple<L extends number, T extends readonly unknown[] = []> = T extends {readonly length: L}
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? T
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: BuildTuple<L, [...T, unknown]>;
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/**
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Create a tuple of length `A` and a tuple composed of two other tuples,
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the inferred tuple `U` and a tuple of length `B`, then extracts the length of tuple `U`.
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@link https://itnext.io/implementing-arithmetic-within-typescripts-type-system-a1ef140a6f6f
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*/
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export type Subtract<A extends number, B extends number> = BuildTuple<A> extends [...(infer U), ...BuildTuple<B>]
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? TupleLength<U>
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: never;
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/**
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Matches any primitive, `Date`, or `RegExp` value.
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*/
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export type BuiltIns = Primitive | Date | RegExp;
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/**
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Gets keys from a type. Similar to `keyof` but this one also works for union types.
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The reason a simple `keyof Union` does not work is because `keyof` always returns the accessible keys of a type. In the case of a union, that will only be the common keys.
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@link https://stackoverflow.com/a/49402091
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*/
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export type KeysOfUnion<T> = T extends T ? keyof T : never;
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export type UpperCaseCharacters = 'A' | 'B' | 'C' | 'D' | 'E' | 'F' | 'G' | 'H' | 'I' | 'J' | 'K' | 'L' | 'M' | 'N' | 'O' | 'P' | 'Q' | 'R' | 'S' | 'T' | 'U' | 'V' | 'W' | 'X' | 'Y' | 'Z';
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export type WordSeparators = '-' | '_' | ' ';
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export type StringDigit = '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9';
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