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| 1 | import { Function } from './Function';
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| 2 | import { Parameters } from './Parameters';
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| 3 | import { Length as LLength } from '../List/Length';
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| 4 | /**
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| 5 | * Extract arguments' length from a [[Function]]
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| 6 | * @param F to extract from
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| 7 | * @returns [[String]] or `number`
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| 8 | * @example
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| 9 | * ```ts
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| 10 | * import {F} from 'ts-toolbelt'
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| 11 | *
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| 12 | * const fn = (a1: any, a2: any) => {}
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| 13 | *
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| 14 | * type test0 = F.LengthOf<typeof fn> // 2
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| 15 | *
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| 16 | * type test1 = F.LengthOf<(a1?: any) => any> // 0 | 1
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| 17 | *
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| 18 | * type test2 = F.LengthOf<(...a: any[]) => any> // number
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| 19 | * ```
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| 20 | */
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| 21 | export declare type Length<Fn extends Function> = LLength<Parameters<Fn>>;
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