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28 lines
869 B
Plaintext
28 lines
869 B
Plaintext
import { isPlainObject as _iPO } from '../core/rtkImports'
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// remove type guard
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const isPlainObject: (_: any) => boolean = _iPO
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export function copyWithStructuralSharing<T>(oldObj: any, newObj: T): T
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export function copyWithStructuralSharing(oldObj: any, newObj: any): any {
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if (
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oldObj === newObj ||
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!(
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(isPlainObject(oldObj) && isPlainObject(newObj)) ||
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(Array.isArray(oldObj) && Array.isArray(newObj))
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)
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) {
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return newObj
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}
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const newKeys = Object.keys(newObj)
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const oldKeys = Object.keys(oldObj)
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let isSameObject = newKeys.length === oldKeys.length
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const mergeObj: any = Array.isArray(newObj) ? [] : {}
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for (const key of newKeys) {
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mergeObj[key] = copyWithStructuralSharing(oldObj[key], newObj[key])
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if (isSameObject) isSameObject = oldObj[key] === mergeObj[key]
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}
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return isSameObject ? oldObj : mergeObj
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}
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