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- function isPlainObject(value) {
- if (value == null || typeof value !== 'object') return false
- return Object.getPrototypeOf(value) === Object.prototype
- }
- function copy(obj, key, value) {
- if (isPlainObject(value)) {
- obj[key] || (obj[key] = {})
- deepExtend(obj[key], value)
- } else {
- obj[key] = value
- }
- }
- export function deepExtend(target, source) {
- if (isPlainObject(source)) {
- const keys = Object.keys(source)
- for (let i = 0, len = keys.length; i < len; i++) {
- copy(target, keys[i], source[keys[i]])
- }
- }
- return target
- }
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