batchloader/dist/browser/mappedbatchloader.js

BatchLoader is a utility for data fetching layer to reduce requests via batching written in TypeScript. Inspired by Facebook's DataLoader

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var MappedBatchLoader = (function () {
    function MappedBatchLoader(loader, mapFn) {
        this.loader = loader;
        this.mapFn = mapFn;
    }
    MappedBatchLoader.prototype.load = function (key) {
        var _this = this;
        return this.loader.load(key).then(function (value) { return _this.mapFn(value, key); });
    };
    MappedBatchLoader.prototype.loadMany = function (keys) {
        var _this = this;
        return this.loader.loadMany(keys).then(function (values) {
            var hasPromise = false;
            var results = [];
            var len = values.length;
            for (var i = 0; i < len; i += 1) {
                var res = _this.mapFn(values[i], keys[i]);
                results.push(res);
                hasPromise =
                    hasPromise ||
                        (res != null && typeof res.then === 'function');
            }
            return hasPromise ? Promise.all(results) : results;
        });
    };
    MappedBatchLoader.prototype.mapLoader = function (mapFn) {
        return new MappedBatchLoader(this, mapFn);
    };
    return MappedBatchLoader;
}());
exports.MappedBatchLoader = MappedBatchLoader;
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