styled-jsx transform infinite loop

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@kdy1 is already working on this.

Since Aug 24, 2026.

Assessment

This issue has not been assessed yet.

Description

Describe the bug

There is an infinite loop when transforming this file with styled-jsx:

Minimal reproduction

Put

export const Probe = (props) => {
  const t = props.theme;
  const Icon = t.icon;
  return (
    <div className="probe">
      <Icon />
      <style jsx>{`
        .probe {
          color: ${t.color};
        }
      `}</style>
    </div>
  );
};

into packages/styled-jsx/transform/tests/fixture/class/input.js

Then you get

> Should transform class correctly
Error: Test timed out in 5000ms.
If this is a long-running test, pass a timeout value as the last argument or configure it globally with "testTimeout".
⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[1/1]⎯


  Snapshots  1 obsolete
             ↳ __tests__/wasm.test.ts
               · Should transform class correctly 1

 Test Files  1 failed (1)
      Tests  1 failed | 2 passed | 78 skipped (81)
   Start at  21:57:39
   Duration  5.43s (transform 23ms, setup 0ms, collect 44ms, tests 5.23s, environment 0ms, prepare 35ms)

This is on commit a93bcc04a4bb2ff676865958db92d85fffd9823a

Expected behavior

It should be transformed and not timeout

Additional context
https://github.com/vercel/next.js/issues/97685

Dominant language
Rust
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Merged PRs (30d)
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