46 lines
1.5 KiB
Plaintext
46 lines
1.5 KiB
Plaintext
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.deepMerge = deepMerge;
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exports.isObjectNotArray = isObjectNotArray;
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/**
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* Check if the variable contains an object strictly rejecting arrays
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* @returns `true` if obj is an object
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*/
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function isObjectNotArray(obj) {
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return typeof obj === 'object' && obj != null && !Array.isArray(obj);
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}
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/**
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* Pure function - doesn't mutate either parameter!
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* Merges two objects together deeply, overwriting the properties in first with the properties in second
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* @param first The first object
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* @param second The second object
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* @returns a new object
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*/
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function deepMerge(first = {}, second = {}) {
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// get the unique set of keys across both objects
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const keys = new Set(Object.keys(first).concat(Object.keys(second)));
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return Array.from(keys).reduce((acc, key) => {
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const firstHasKey = key in first;
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const secondHasKey = key in second;
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const firstValue = first[key];
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const secondValue = second[key];
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if (firstHasKey && secondHasKey) {
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if (isObjectNotArray(firstValue) && isObjectNotArray(secondValue)) {
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// object type
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acc[key] = deepMerge(firstValue, secondValue);
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}
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else {
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// value type
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acc[key] = secondValue;
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}
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}
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else if (firstHasKey) {
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acc[key] = firstValue;
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}
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else {
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acc[key] = secondValue;
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}
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return acc;
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}, {});
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}
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//# sourceMappingURL=deepMerge.js.map |