Parse error in scripts with shebang and dynamic import

Acknowledgements

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Minimal reproduction URL

https://github.com/jfeingold35/tsx-issue-repro-2026-09-16

Problem & expected behavior (under 200 words)

When a script has a dynamic import (await import()) and a shebang (e.g., #!/usr/bin/env -S node --import tsx), a Parse Error occurs.

This is happening because the shebang is not being stripped out before the code is passed into the lexer.

Bugs are expected to be fixed by those affected by it

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