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15 lines
637 B
TypeScript
15 lines
637 B
TypeScript
// Loaded from https://deno.land/x/graphql_deno@v15.0.0/lib/jsutils/promiseReduce.js
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import isPromise from './isPromise.js';
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/**
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* Similar to Array.prototype.reduce(), however the reducing callback may return
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* a Promise, in which case reduction will continue after each promise resolves.
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*
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* If the callback does not return a Promise, then this function will also not
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* return a Promise.
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*/
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export default function promiseReduce(values, callback, initialValue) {
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return values.reduce((previous, value) => isPromise(previous) ? previous.then(resolved => callback(resolved, value)) : callback(previous, value), initialValue);
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} |