27 lines
756 B
JavaScript
27 lines
756 B
JavaScript
/**
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* This will wrap the given function to make sure that it is only triggered once
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* while executing asynchronously
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*
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* @param {Function} fn some function that returns a promise
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* @returns A function that will only be triggered *once* while the promise is executing
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*/
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export const ignoreWhilePending = (fn) => {
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const isPendingMap = new WeakMap();
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const defaultContext = {};
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// We need this to be a function so we get the `this`
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return function ignoreWhilePendingInner(...args) {
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const context = this || defaultContext;
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if (isPendingMap.get(context)) {
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return Promise.resolve();
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}
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isPendingMap.set(context, true);
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return fn.apply(this, args).finally(() => {
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isPendingMap.delete(context);
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});
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};
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};
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