extend2
Version:
Port of jQuery.extend for Node.js
74 lines • 5.71 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.extend = void 0;
const hasOwn = Object.prototype.hasOwnProperty;
const toStr = Object.prototype.toString;
function isPlainObject(obj) {
if (!obj || toStr.call(obj) !== '[object Object]') {
return false;
}
const hasOwnConstructor = hasOwn.call(obj, 'constructor');
const hasIsPrototypeOf = obj.constructor && obj.constructor.prototype && hasOwn.call(obj.constructor.prototype, 'isPrototypeOf');
// Not own constructor property must be Object
if (obj.constructor && !hasOwnConstructor && !hasIsPrototypeOf) {
return false;
}
// Own properties are enumerated firstly, so to speed up,
// if last one is own, then all properties are own.
let key;
for (key in obj) {
/**/
}
return typeof key === 'undefined' || hasOwn.call(obj, key);
}
function extend(deepOrTarget, ...objects) {
// extend(deep, target, obj1, obj2, ...)
// extend(target, obj1, obj2, ...)
let target = deepOrTarget;
let i = 0;
const length = objects.length;
let deep = false;
// Handle a deep copy situation
if (typeof target === 'boolean') {
// extend(deep, target, obj1, obj2, ...)
deep = target;
target = objects[0] || {};
// skip the boolean and the target
i = 1;
}
else if ((typeof target !== 'object' && typeof target !== 'function') || target == null) {
// extend(null, obj1, obj2, ...)
target = {};
}
for (; i < length; ++i) {
const options = objects[i];
// Only deal with non-null/undefined values
if (options === null || options === undefined)
continue;
// Extend the base object
for (const name in options) {
if (name === '__proto__')
continue;
const src = target[name];
const copy = options[name];
// Prevent never-ending loop
if (target === copy)
continue;
// Recurse if we're merging plain objects
if (deep && copy && isPlainObject(copy)) {
const clone = src && isPlainObject(src) ? src : {};
// Never move original objects, clone them
target[name] = extend(deep, clone, copy);
// Don't bring in undefined values
}
else if (typeof copy !== 'undefined') {
target[name] = copy;
}
}
}
// Return the modified object
return target;
}
exports.extend = extend;
exports.default = extend;
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