@graphql-tools/graphql/cjs/jsutils/promiseReduce.js

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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.promiseReduce = void 0;
const isPromise_js_1 = require("./isPromise.js");
/**
 * Similar to Array.prototype.reduce(), however the reducing callback may return
 * a Promise, in which case reduction will continue after each promise resolves.
 *
 * If the callback does not return a Promise, then this function will also not
 * return a Promise.
 */
function promiseReduce(values, callbackFn, initialValue) {
    let accumulator = initialValue;
    for (const value of values) {
        accumulator = (0, isPromise_js_1.isPromise)(accumulator)
            ? accumulator.then(resolved => callbackFn(resolved, value))
            : callbackFn(accumulator, value);
    }
    return accumulator;
}
exports.promiseReduce = promiseReduce;