Understanding the request deduplication mechanism

[andykao1213]

I encounter some issues with the options onSuccess and open this issue #1125 . It turns out that I have misunderstood the mechanism behind SWR deduplication. I wrote a blog to explain it and hope it can help someone who is also not familiar with the library.

TL;DR

• When the hook is mounted, it will first check if there is data of the same key in the cache. If there is, set it to the return value data.
• Then check if there is any hook with the same key mounted before during the depupingInterval. If not, trigger the request.
• After the request success, only the onSuccess callback in the same hook will be fired.