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59 lines
1.1 KiB
59 lines
1.1 KiB
export interface Options { |
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/** |
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Throw an error when called more than once. |
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@default false |
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*/ |
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readonly throw?: boolean; |
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} |
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declare const onetime: { |
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/** |
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Ensure a function is only called once. When called multiple times it will return the return value from the first call. |
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@param fn - Function that should only be called once. |
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@returns A function that only calls `fn` once. |
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@example |
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``` |
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import onetime from 'onetime'; |
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let index = 0; |
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const foo = onetime(() => ++index); |
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foo(); //=> 1 |
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foo(); //=> 1 |
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foo(); //=> 1 |
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onetime.callCount(foo); //=> 3 |
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``` |
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*/ |
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<ArgumentsType extends unknown[], ReturnType>( |
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fn: (...arguments: ArgumentsType) => ReturnType, |
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options?: Options |
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): (...arguments: ArgumentsType) => ReturnType; |
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/** |
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Get the number of times `fn` has been called. |
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@param fn - Function to get call count from. |
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@returns A number representing how many times `fn` has been called. |
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@example |
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``` |
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import onetime from 'onetime'; |
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const foo = onetime(() => {}); |
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foo(); |
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foo(); |
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foo(); |
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console.log(onetime.callCount(foo)); |
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//=> 3 |
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``` |
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*/ |
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callCount(fn: (...arguments: any[]) => unknown): number; |
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}; |
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export default onetime;
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