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Construct negative numeric literal nodes via createPrefixUnaryExpression + createNumericLiteral #1480

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Construct negative numeric literal nodes via createPrefixUnaryExpression + createNumericLiteral #1480

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8 changes: 7 additions & 1 deletion src/enum_transformer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -124,7 +124,13 @@ export function enumTransformer(typeChecker: ts.TypeChecker):
const enumConstValue = typeChecker.getConstantValue(member);
if (typeof enumConstValue === 'number') {
enumIndex = enumConstValue + 1;
enumValue = ts.factory.createNumericLiteral(enumConstValue);
if (enumConstValue < 0) {
enumValue = ts.factory.createPrefixUnaryExpression(
ts.SyntaxKind.MinusToken,
ts.factory.createNumericLiteral(-enumConstValue));
} else {
enumValue = ts.factory.createNumericLiteral(enumConstValue);
}
} else if (typeof enumConstValue === 'string') {
// tsickle does not care about string enum values. However TypeScript expects compile
// time constant enum values to be replaced with their constant expression, and e.g.
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