63 lines
2.1 KiB
JavaScript
63 lines
2.1 KiB
JavaScript
import { isPlainObject } from '../predicate/isPlainObject.mjs';
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function defaultsDeep(target, ...sources) {
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target = Object(target);
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for (let i = 0; i < sources.length; i++) {
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const source = sources[i];
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if (source != null) {
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defaultsDeepRecursive(target, source, new WeakMap());
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}
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}
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return target;
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}
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function defaultsDeepRecursive(target, source, stack) {
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for (const key in source) {
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const sourceValue = source[key];
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const targetValue = target[key];
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if (targetValue === undefined || !Object.hasOwn(target, key)) {
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target[key] = handleMissingProperty(sourceValue, stack);
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continue;
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}
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if (stack.get(sourceValue) === targetValue) {
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continue;
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}
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handleExistingProperty(targetValue, sourceValue, stack);
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}
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}
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function handleMissingProperty(sourceValue, stack) {
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if (stack.has(sourceValue)) {
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return stack.get(sourceValue);
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}
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if (isPlainObject(sourceValue)) {
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const newObj = {};
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stack.set(sourceValue, newObj);
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defaultsDeepRecursive(newObj, sourceValue, stack);
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return newObj;
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}
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return sourceValue;
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}
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function handleExistingProperty(targetValue, sourceValue, stack) {
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if (isPlainObject(targetValue) && isPlainObject(sourceValue)) {
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stack.set(sourceValue, targetValue);
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defaultsDeepRecursive(targetValue, sourceValue, stack);
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return;
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}
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if (Array.isArray(targetValue) && Array.isArray(sourceValue)) {
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stack.set(sourceValue, targetValue);
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mergeArrays(targetValue, sourceValue, stack);
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}
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}
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function mergeArrays(targetArray, sourceArray, stack) {
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const minLength = Math.min(sourceArray.length, targetArray.length);
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for (let i = 0; i < minLength; i++) {
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if (isPlainObject(targetArray[i]) && isPlainObject(sourceArray[i])) {
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defaultsDeepRecursive(targetArray[i], sourceArray[i], stack);
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}
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}
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for (let i = minLength; i < sourceArray.length; i++) {
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targetArray.push(sourceArray[i]);
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}
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}
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export { defaultsDeep };
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