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[Flight] Implement useId hook #24172

Merged
merged 6 commits into from
May 31, 2022
Merged

[Flight] Implement useId hook #24172

merged 6 commits into from
May 31, 2022

Commits on May 31, 2022

  1. Implements useId hook for Flight server. 

    The approach for ids for Flight is different from Fizz/Client where there is a need for determinancy. Flight rendered elements will not be rendered on the client and as such the ids generated in a request only need to be unique. However since FLight does support refetching subtrees it is possible a client will need to patch up a part of the tree rather than replacing the entire thing so it is not safe to use a simple incrementing counter. To solve for this we allow the caller to specify a prefix. On an initial fetch it is likely this will be empty but on refetches or subtrees we expect to have a client `useId` provide the prefix since it will guaranteed be unique for that subtree and thus for the entire tree. It is also possible that we will automatically provide prefixes based on a client/Fizz useId on refetches

in addition to the core change I also modified the structure of options for renderToReadableStream where `onError`, `context`, and the new `identifierPrefix` are properties of an Options object argument to avoid the clumsiness of a growing list of optional function arguments.
    @gnoff
    gnoff committed May 31, 2022
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  2. defend against useId call outside of rendering

    @gnoff
    gnoff committed May 31, 2022
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  3. switch to S from F for Server Component ids

    @gnoff
    gnoff committed May 31, 2022
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  4. default to empty string identifier prefix

    @gnoff
    gnoff committed May 31, 2022
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  5. Add a test demonstrating that there is no warning when double renderi… 

    …ng on the client a server component that used useId
    @gnoff
    gnoff committed May 31, 2022
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  6. lints and gates

    @gnoff
    gnoff committed May 31, 2022
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