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Improved undefined/null handling for unary operators

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This commit is contained in:
Anders Hejlsberg 2017-01-13 16:09:03 -08:00
parent 6dcaac6214
commit 894ba853a0
1 changed files with 3 additions and 2 deletions
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5
src/compiler/checker.ts
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@ -14483,6 +14483,7 @@ namespace ts {
case SyntaxKind.PlusToken:
case SyntaxKind.MinusToken:
case SyntaxKind.TildeToken:
checkNonNullType(operandType, node.operand);
if (maybeTypeOfKind(operandType, TypeFlags.ESSymbol)) {
error(node.operand, Diagnostics.The_0_operator_cannot_be_applied_to_type_symbol, tokenToString(node.operator));
}
@ -14494,7 +14495,7 @@ namespace ts {
booleanType;
case SyntaxKind.PlusPlusToken:
case SyntaxKind.MinusMinusToken:
const ok = checkArithmeticOperandType(node.operand, getNonNullableType(operandType),
const ok = checkArithmeticOperandType(node.operand, checkNonNullType(operandType, node.operand),
Diagnostics.An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type);
if (ok) {
// run check only if former checks succeeded to avoid reporting cascading errors
@ -14510,7 +14511,7 @@ namespace ts {
if (operandType === silentNeverType) {
return silentNeverType;
}
const ok = checkArithmeticOperandType(node.operand, getNonNullableType(operandType),
const ok = checkArithmeticOperandType(node.operand, checkNonNullType(operandType, node.operand),
Diagnostics.An_arithmetic_operand_must_be_of_type_any_number_or_an_enum_type);
if (ok) {
// run check only if former checks succeeded to avoid reporting cascading errors