microsoft/TypeScript
1
0
Fork 0
mirror of https://github.com/microsoft/TypeScript.git synced 2026-05-30 11:24:49 -05:00
Code Issues Packages Projects Releases 212 Wiki Activity

Merge pull request #17710 from Microsoft/add-readonly-check-to-property-access-of-index-signature

Browse Source 
Add readonly check to property access of index signature
This commit is contained in:
Nathan Shively-Sanders
2017-08-16 11:16:54 -07:00
committed by GitHub
parent 34a55899be 7809398ad4
commit 146f828919
9 changed files with 79 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
src/compiler/checker.ts
View File

@@ -7576,7 +7576,6 @@ namespace ts {
if (indexInfo) {
if (accessExpression && indexInfo.isReadonly && (isAssignmentTarget(accessExpression) || isDeleteTarget(accessExpression))) {
error(accessExpression, Diagnostics.Index_signature_in_type_0_only_permits_reading, typeToString(objectType));
return unknownType;
}
return indexInfo.type;
}
@@ -7617,7 +7616,6 @@ namespace ts {
}
if (accessNode.kind === SyntaxKind.ElementAccessExpression && isAssignmentTarget(accessNode) && type.declaration.readonlyToken) {
error(accessNode, Diagnostics.Index_signature_in_type_0_only_permits_reading, typeToString(type));
return unknownType;
}
}
const mapper = createTypeMapper([getTypeParameterFromMappedType(type)], [indexType]);
@@ -14615,9 +14613,12 @@ namespace ts {
}
const prop = getPropertyOfType(apparentType, right.escapedText);
if (!prop) {
const stringIndexType = getIndexTypeOfType(apparentType, IndexKind.String);
if (stringIndexType) {
return stringIndexType;
const indexInfo = getIndexInfoOfType(apparentType, IndexKind.String);
if (indexInfo && indexInfo.type) {
if (indexInfo.isReadonly && (isAssignmentTarget(node) || isDeleteTarget(node))) {
error(node, Diagnostics.Index_signature_in_type_0_only_permits_reading, typeToString(apparentType));
}
return indexInfo.type;
}
if (right.escapedText && !checkAndReportErrorForExtendingInterface(node)) {
reportNonexistentProperty(right, type.flags & TypeFlags.TypeParameter && (type as TypeParameter).isThisType ? apparentType : type);
@@ -17138,7 +17139,9 @@ namespace ts {
if (operandType === silentNeverType) {
return silentNeverType;
}
const ok = checkArithmeticOperandType(node.operand, checkNonNullType(operandType, node.operand),
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