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fix(minifier): do not change delete undefined to delete void 0 #8527

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merged 1 commit into from
Jan 16, 2025
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fix(minifier): do not change delete undefined to delete void 0 #8527

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9 changes: 9 additions & 0 deletions crates/oxc_minifier/src/ast_passes/peephole_substitute_alternate_syntax.rs
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Original file line number Diff line number Diff line change
@@ -250,6 +250,12 @@ impl<'a, 'b> PeepholeSubstituteAlternateSyntax {
if !ctx.is_identifier_undefined(ident) {
return None;
}
// `delete undefined` returns `false`
// `delete void 0` returns `true`
if matches!(ctx.parent(), Ancestor::UnaryExpressionArgument(e) if e.operator().is_delete())
{
return None;
}
Some(ctx.ast.void_0(ident.span))
}

@@ -1297,6 +1303,9 @@ mod test {
// destructuring throw error side effect
test_same("var {} = void 0");
test_same("var [] = void 0");
// `delete undefined` returns `false`
// `delete void 0` returns `true`
test_same("delete undefined");
}

#[test]
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