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okay, let's dive into the breaking changes introduced in `[email protected]`. this release included some significant updates that might require adjustments to your code when upgrading from older versions. i'll provide detailed explanations, code examples, and guidance on how to adapt to these changes.

*key breaking changes in `[email protected]`*

1. *`querykey` type change:*

*what changed:* in older versions of react query, `querykey` was often defined as a simple `string` or a `string[]`. in `v4.3.0`, the type definition was broadened and tightened:



*why the change:* this was done to allow for more complex query keys, including objects, while still providing some type safety. it prevents accidental modification of the keys.

*impact:* if your code directly used type assertions or assumptions about the specific structure of `querykey`, you might need to update them. if you were defining your own type aliases for `querykey` you will need to adjust them.

*example (before):*



*example (after):*



*explanation:*

the `querykey` is now best represented as an array, where the first element is a descriptive string (e.g., 'mydata') and subsequent elements are the parameters that uniquely identify the query (e.g., `id`). this structure is easier to manage and makes debugging much simpler.
`invalidatequeries` and other functions that interact with query keys should use the same array structure.
the array ensures that the keys are deeply compared for equality.

2. *`keeppreviousdata` option changes:*

*what changed:* the `keeppreviousdata` option in `usequery` underwent a modification to its behavior. previously, if you set `keeppreviousdata: true` and the query failed, the previous data would always be preserved. now, with the new behavior, if a query errors before it has ever been successfully fetched, `keeppreviousdata ...

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breaking changes
version 0.43
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