[Bug]: `react/jsx-key` false positive on non-final arrays

[hasparus]

Is there an existing issue for this?

• I have searched the existing issues and my issue is unique
• My issue appears in the command-line and not only in the text editor

Description Overview

react/jsx-key is raised on arrays inline in JSX even if they're immediately consumed and not subject to reconciliation.

<>
  {[
    <p>a</p> // Missing "key" prop for element in array ESLint[react/jsx-key],
    // ...
  ].map(
    (text, i) => <div key={i}>{text}</div>
  )}
</>

In this example, React doesn't need a key because on p because it's the only child, right?

Here's a repro:

https://eslint-online-playground.netlify.app/#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

What is happening? / What is the error?

I see the warning where it's not needed.

What command(s) did you run to reproduce issue?

eslint

Expected Behavior

I'd expect the warning to appear only when the missing key causes a warning logged by React in development.

I can open a PR if it makes sense.

eslint-plugin-react version

v7.33.2

eslint version

v9.35.0

node version

v24

[ljharb]

Yes, it still needs a key because it's an array. If you only want one child, then it shouldn't use an array.

[hasparus]

but the key is on the div, isn't it? the paragraph has no siblings