| 1 | import { isPlainObject as _iPO } from '../core/rtkImports'
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| 2 |
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| 3 |
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| 4 | const isPlainObject: (_: any) => boolean = _iPO
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| 5 |
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| 6 | export function copyWithStructuralSharing<T>(oldObj: any, newObj: T): T
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| 7 | export function copyWithStructuralSharing(oldObj: any, newObj: any): any {
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| 8 | if (
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| 9 | oldObj === newObj ||
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| 10 | !(
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| 11 | (isPlainObject(oldObj) && isPlainObject(newObj)) ||
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| 12 | (Array.isArray(oldObj) && Array.isArray(newObj))
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| 13 | )
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| 14 | ) {
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| 15 | return newObj
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| 16 | }
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| 17 | const newKeys = Object.keys(newObj)
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| 18 | const oldKeys = Object.keys(oldObj)
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| 19 |
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| 20 | let isSameObject = newKeys.length === oldKeys.length
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| 21 | const mergeObj: any = Array.isArray(newObj) ? [] : {}
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| 22 | for (const key of newKeys) {
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| 23 | mergeObj[key] = copyWithStructuralSharing(oldObj[key], newObj[key])
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| 24 | if (isSameObject) isSameObject = oldObj[key] === mergeObj[key]
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| 25 | }
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| 26 | return isSameObject ? oldObj : mergeObj
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| 27 | }
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