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backend/node_modules/map-obj/index.js

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+'use strict';
+
+const isObject = value => typeof value === 'object' && value !== null;
+const mapObjectSkip = Symbol('skip');
+
+// Customized for this use-case
+const isObjectCustom = value =>
+	isObject(value) &&
+	!(value instanceof RegExp) &&
+	!(value instanceof Error) &&
+	!(value instanceof Date);
+
+const mapObject = (object, mapper, options, isSeen = new WeakMap()) => {
+	options = {
+		deep: false,
+		target: {},
+		...options
+	};
+
+	if (isSeen.has(object)) {
+		return isSeen.get(object);
+	}
+
+	isSeen.set(object, options.target);
+
+	const {target} = options;
+	delete options.target;
+
+	const mapArray = array => array.map(element => isObjectCustom(element) ? mapObject(element, mapper, options, isSeen) : element);
+	if (Array.isArray(object)) {
+		return mapArray(object);
+	}
+
+	for (const [key, value] of Object.entries(object)) {
+		const mapResult = mapper(key, value, object);
+
+		if (mapResult === mapObjectSkip) {
+			continue;
+		}
+
+		let [newKey, newValue, {shouldRecurse = true} = {}] = mapResult;
+
+		// Drop `__proto__` keys.
+		if (newKey === '__proto__') {
+			continue;
+		}
+
+		if (options.deep && shouldRecurse && isObjectCustom(newValue)) {
+			newValue = Array.isArray(newValue) ?
+				mapArray(newValue) :
+				mapObject(newValue, mapper, options, isSeen);
+		}
+
+		target[newKey] = newValue;
+	}
+
+	return target;
+};
+
+module.exports = (object, mapper, options) => {
+	if (!isObject(object)) {
+		throw new TypeError(`Expected an object, got \`${object}\` (${typeof object})`);
+	}
+
+	return mapObject(object, mapper, options);
+};
+
+module.exports.mapObjectSkip = mapObjectSkip;