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65 lines
1.2 KiB
65 lines
1.2 KiB
1 year ago
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declare namespace onetime {
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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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throw?: boolean;
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}
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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 = require('onetime');
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let i = 0;
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const foo = onetime(() => ++i);
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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?: onetime.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 = require('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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// TODO: Remove this for the next major release
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default: typeof onetime;
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};
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export = onetime;
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