Use the initCache function for the cache to be passed to the provider in SWRConfig.

[naporin0624]

Description

Thank you for developing this wonderful library. I found some changes in the documentation that would make it even better!

• The provider passed to SWRConfig has been changed to one using initCache.
• Added to the documentation to use the return value of initCache instead of using global mutate.

swr's defaultCache is created using initCache and swr's global mutate references it. https://github.com/vercel/swr/blob/main/_internal/src/utils/config.ts#L43-L45

There have been a few issues about SWRConfig not working when using global mutate after changing the provider in SWRConfig, and this would solve that problem.

https://github.com/vercel/swr/issues/2799

• [ ] Adding new page
• [X] Updating existing documentation
• [ ] Other updates

Example

https://codesandbox.io/s/swr-initcache-ltfwn6?file=/src/App.tsx

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