Fix(parser): async x => {} must be in leading pos#17839
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JLHwung merged 2 commits intobabel:mainfrom Feb 27, 2026
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PR: Spec Compliance (next major) 👓
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nicolo-ribaudo
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liuxingbaoyu
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I'm surprised we passed all the test262 syntax tests in the past. :)
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Yeah, apparently |
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No problem, this shouldn't affect anyone. :) |
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In this PR we forbid the single name async arrow, e.g.
async x => {}forming in the unary argument, binary expression, class heritage and legacy decorators. Previously such productions were accepted by the parser but they are not allowed in the spec.