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split.d.ts
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split.d.ts
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/**
Represents an array of strings split using a given character or character set.
Use-case: Defining the return type of a method like `String.prototype.split`.
@example
```
import type {Split} from 'type-fest';
declare function split<S extends string, D extends string>(string: S, separator: D): Split<S, D>;
type Item = 'foo' | 'bar' | 'baz' | 'waldo';
const items = 'foo,bar,baz,waldo';
let array: Item[];
array = split(items, ',');
```
@category String
@category Template literal
*/
export type Split<
S extends string,
Delimiter extends string,
> = S extends `${infer Head}${Delimiter}${infer Tail}`
? [Head, ...Split<Tail, Delimiter>]
: S extends Delimiter
? []
: [S];