Function getTypeOfMappedSymbol

test/fixtures/snapshot/typescript.js:58607–58630

(symbol)

            }
        }
        function getTypeOfMappedSymbol(symbol) {
            if (!symbol.type) {
                var mappedType = symbol.mappedType;
                if (!pushTypeResolution(symbol, 0 /* TypeSystemPropertyName.Type */)) {
                    mappedType.containsError = true;
                    return errorType;
                }
                var templateType = getTemplateTypeFromMappedType(mappedType.target || mappedType);
                var mapper = appendTypeMapping(mappedType.mapper, getTypeParameterFromMappedType(mappedType), symbol.keyType);
                var propType = instantiateType(templateType, mapper);
                // When creating an optional property in strictNullChecks mode, if 'undefined' isn't assignable to the
                // type, we include 'undefined' in the type. Similarly, when creating a non-optional property in strictNullChecks
                // mode, if the underlying property is optional we remove 'undefined' from the type.
                var type = strictNullChecks && symbol.flags & 16777216 /* SymbolFlags.Optional */ && !maybeTypeOfKind(propType, 32768 /* TypeFlags.Undefined */ | 16384 /* TypeFlags.Void */) ? getOptionalType(propType, /*isProperty*/ true) :
                    symbol.checkFlags & 524288 /* CheckFlags.StripOptional */ ? removeMissingOrUndefinedType(propType) :
                        propType;
                if (!popTypeResolution()) {
                    error(currentNode, ts.Diagnostics.Type_of_property_0_circularly_references_itself_in_mapped_type_1, symbolToString(symbol), typeToString(mappedType));
                    type = errorType;
                }
                symbol.type = type;
            }
            return symbol.type;
        }
        function getTypeParameterFromMappedType(type) {
            return type.typeParameter ||
                (type.typeParameter = getDeclaredTypeOfTypeParameter(getSymbolOfNode(type.declaration.typeParameter)));