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fix: check if modifiersType is undefined before passing it #148

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fix: check if modifiersType is undefined before passing it #148

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5 changes: 4 additions & 1 deletion util/type.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -286,7 +286,10 @@ function isReadonlyPropertyFromMappedType(type: ts.Type, name: ts.__String, chec
// well-known symbols are not affected by mapped types
if (declaration.readonlyToken !== undefined && !/^__@[^@]+$/.test(<string>name))
return declaration.readonlyToken.kind !== ts.SyntaxKind.MinusToken;
return isPropertyReadonlyInType((<{modifiersType: ts.Type}><unknown>type).modifiersType, name, checker);
const modifiersType = (<{ modifiersType: ts.Type }><unknown>type).modifiersType;
if (modifiersType === undefined)
return false;
return isPropertyReadonlyInType(modifiersType, name, checker);
}

export function symbolHasReadonlyDeclaration(symbol: ts.Symbol, checker: ts.TypeChecker) {
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