plain-object-merge/dist/index.js

Extremely fast function optimized for deep merging json-serializable plain objects.

/* IMPORT */
import clone from 'plain-object-clone';
import { isArray, isPrimitive } from './utils.js';
/* MAIN */
const mergeObjects = (target, source) => {
    for (const key in source) {
        if (!source.hasOwnProperty(key))
            continue;
        if (key === 'constructor' || key === 'prototype' || key === '__proto__')
            continue;
        const value = source[key];
        if (isPrimitive(value)) {
            if (value !== undefined || !(key in target)) {
                target[key] = value;
            }
        }
        else if (!target[key] || isArray(value)) {
            target[key] = clone(value);
        }
        else {
            target[key] = mergeObjects(target[key], value);
        }
    }
    return target;
};
const merge = (objects) => {
    const target = clone(objects[0]);
    for (let i = 1, l = objects.length; i < l; i++) {
        mergeObjects(target, objects[i]);
    }
    return target;
};
/* EXPORT */
export default merge;