48 lines
1.1 KiB
Plaintext
48 lines
1.1 KiB
Plaintext
import type {IsNumericLiteral} from './is-literal';
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import type {IsNegative} from './numeric';
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/**
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Returns a new string which contains the specified number of copies of a given string, just like `String#repeat()`.
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@example
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```
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import {StringRepeat} from 'type-fest';
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declare function stringRepeat<
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Input extends string,
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Count extends number
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>(input: Input, count: Count): StringRepeat<Input, Count>;
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// The return type is the exact string literal, not just `string`.
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stringRepeat('foo', 2);
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//=> 'foofoo'
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stringRepeat('=', 3);
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//=> '==='
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```
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@category String
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@category Template literal
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*/
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export type StringRepeat<
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Input extends string,
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Count extends number,
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> = StringRepeatHelper<Input, Count>;
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type StringRepeatHelper<
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Input extends string,
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Count extends number,
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Counter extends never[] = [],
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Accumulator extends string = '',
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> =
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IsNegative<Count> extends true
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? never
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: Input extends ''
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? ''
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: Count extends Counter['length']
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? Accumulator
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: IsNumericLiteral<Count> extends false
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? string
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: StringRepeatHelper<Input, Count, [...Counter, never], `${Accumulator}${Input}`>;
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