33 lines
1.0 KiB
JavaScript
33 lines
1.0 KiB
JavaScript
import { isUnsafeProperty } from '../_internal/isUnsafeProperty.mjs';
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import { isPlainObject } from '../predicate/isPlainObject.mjs';
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function merge(target, source) {
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const sourceKeys = Object.keys(source);
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for (let i = 0; i < sourceKeys.length; i++) {
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const key = sourceKeys[i];
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if (isUnsafeProperty(key)) {
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continue;
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}
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const sourceValue = source[key];
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const targetValue = target[key];
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if (isMergeableValue(sourceValue) && isMergeableValue(targetValue)) {
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target[key] = merge(targetValue, sourceValue);
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}
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else if (Array.isArray(sourceValue)) {
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target[key] = merge([], sourceValue);
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}
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else if (isPlainObject(sourceValue)) {
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target[key] = merge({}, sourceValue);
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}
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else if (targetValue === undefined || sourceValue !== undefined) {
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target[key] = sourceValue;
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}
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}
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return target;
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}
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function isMergeableValue(value) {
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return isPlainObject(value) || Array.isArray(value);
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}
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export { merge };
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