snapshot of https://github.com/TanStack/query.git (main, 2026-09-16; blobs > 131072B omitted)

docs/framework/preact/reference/functions/replaceEqualDeep.md

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+---
+id: replaceEqualDeep
+title: replaceEqualDeep
+---
+
+```ts
+function replaceEqualDeep<T>(
+   a, 
+   b, 
+   depth?): T;
+```
+
+Defined in: [packages/query-core/src/utils.ts:339](https://github.com/TanStack/query/blob/main/packages/query-core/src/utils.ts#L339)
+
+This function returns `a` if `b` is deeply equal.
+If not, it will replace any deeply equal children of `b` with those of `a`.
+This can be used for structural sharing between JSON values for example.
+
+## Type Parameters
+
+### T
+
+`T`
+
+## Parameters
+
+### a
+
+`unknown`
+
+### b
+
+`T`
+
+### depth?
+
+`number`
+
+## Returns
+
+`T`