const id = objectType.id + "," + indexType.id;

return indexedAccessTypes[id] || (indexedAccessTypes[id] = createIndexedAccessType(objectType, indexType));

}

const propTypes: Type[] = [];

if (propType === unknownType) {

return unknownType;

}

propTypes.push(propType);

}

return getUnionType(propTypes);

}

}

function getTypeFromIndexedAccessTypeNode(node: IndexedAccessTypeNode) {

if (source.flags & TypeFlags.Index) {

// A keyof T is related to a union type containing both string and number

return Ternary.True;

}

}

if (!isTypeAnyOrAllConstituentTypesHaveKind(leftType, TypeFlags.StringLike | TypeFlags.NumberLike | TypeFlags.ESSymbol)) {

error(left, Diagnostics.The_left_hand_side_of_an_in_expression_must_be_of_type_any_string_number_or_symbol);

}

error(right, Diagnostics.The_right_hand_side_of_an_in_expression_must_be_of_type_any_an_object_type_or_a_type_parameter);

}

return booleanType;

const rightType = checkNonNullExpression(node.expression);

// unknownType is returned i.e. if node.expression is identifier whose name cannot be resolved

// in this case error about missing name is already reported - do not report extra one

error(node.expression, Diagnostics.The_right_hand_side_of_a_for_in_statement_must_be_of_type_any_an_object_type_or_a_type_parameter);

}