44 lines
1.5 KiB
JavaScript
44 lines
1.5 KiB
JavaScript
import { isPlainObject } from '../predicate/isPlainObject.mjs';
|
|
|
|
function defaultsDeep(target, ...sources) {
|
|
target = Object(target);
|
|
for (let i = 0; i < sources.length; i++) {
|
|
const source = sources[i];
|
|
if (source != null) {
|
|
const stack = new WeakMap();
|
|
defaultsDeepRecursive(target, source, stack);
|
|
}
|
|
}
|
|
return target;
|
|
}
|
|
function defaultsDeepRecursive(target, source, stack) {
|
|
for (const key in source) {
|
|
const sourceValue = source[key];
|
|
const targetValue = target[key];
|
|
const targetHasKey = Object.hasOwn(target, key);
|
|
if (!targetHasKey || targetValue === undefined) {
|
|
if (stack.has(sourceValue)) {
|
|
target[key] = stack.get(sourceValue);
|
|
}
|
|
else if (isPlainObject(sourceValue)) {
|
|
const newObj = {};
|
|
stack.set(sourceValue, newObj);
|
|
target[key] = newObj;
|
|
defaultsDeepRecursive(newObj, sourceValue, stack);
|
|
}
|
|
else {
|
|
target[key] = sourceValue;
|
|
}
|
|
}
|
|
else if (isPlainObject(targetValue) && isPlainObject(sourceValue)) {
|
|
const inStack = stack.has(sourceValue);
|
|
if (!inStack || (inStack && stack.get(sourceValue) !== targetValue)) {
|
|
stack.set(sourceValue, targetValue);
|
|
defaultsDeepRecursive(targetValue, sourceValue, stack);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
export { defaultsDeep };
|