@feugene/mu/dist/esm/object/defaults.mjs

Helpful TS utilities without dependencies

import clone from '../core/clone.mjs';
import isObject from '../is/isObject.mjs';
/**
 * Assigns own and inherited enumerable string keyed properties of source
 * objects to the destination object for all destination properties that
 * resolve to `undefined`. Source objects are applied from left to right.
 * Once a property is set, additional values of the same property are ignored.
 *
 * **Note:** This method mutates `object`.
 *
 * @example
 *
 * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
 * // => { 'a': 1, 'b': 2 }
 */
export default function defaults(origin, ...destinations) {
    const ln = destinations.length;
    let i = 0, object, key, value, sourceKey;
    for (; i < ln; i++) {
        object = destinations[i];
        if (!isObject(object)) {
            continue;
        }
        for (key in object) {
            value = object[key];
            if (value && value.constructor === Object) {
                sourceKey = origin[key];
                if (sourceKey && sourceKey.constructor === Object) {
                    defaults(sourceKey, value);
                }
                else {
                    origin[key] = clone(value);
                }
            }
            else {
                if (!Object.prototype.hasOwnProperty.call(origin, key)) {
                    origin[key] = value;
                }
            }
        }
    }
    return origin;
}
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