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fix(parser-native): unblock stdlib expansion by avoiding bare case-decl pattern (#597) #603

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Merged
cs01 merged 1 commit into from
Apr 20, 2026
Merged

fix(parser-native): unblock stdlib expansion by avoiding bare case-decl pattern (#597) #603

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19 changes: 13 additions & 6 deletions src/parser-native/transformer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -526,12 +526,7 @@ function transformExpression(node: TreeSitterNode): Expression {
return transformBinaryExpression(node);

case "unary_expression":
// void expressions evaluate to undefined (not a unary op in our AST)
const voidOpChild = getChild(node, 0);
if (voidOpChild && (voidOpChild as NodeBase).type === "void") {
return { type: "variable", name: "undefined" };
}
return transformUnaryExpression(node);
return transformUnaryExpressionOrVoid(node);

case "update_expression":
return transformUpdateExpression(node);
Expand Down Expand Up @@ -616,6 +611,18 @@ function transformExpression(node: TreeSitterNode): Expression {
}
}

// Extracted to a helper so the "unary_expression" switch case in
// transformExpression is a single-statement body — avoiding parser-native's
// tree-sitter iteration dropping the trailing return when a bare case body has
// [var_decl, if_no_else, return]. See #597 for diagnostic.
function transformUnaryExpressionOrVoid(node: TreeSitterNode): Expression {
const voidOpChild = getChild(node, 0);
if (voidOpChild && (voidOpChild as NodeBase).type === "void") {
return { type: "variable", name: "undefined" };
}
return transformUnaryExpression(node);
}

// ============================================
// JSX DESUGARING (native parser)
// Mirrors the TS-API parser's JSX desugaring.
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