Function getNameTypeFromMappedType

test/fixtures/snapshot/typescript.js:58639–58643

(type)

                (type.constraintType = getConstraintOfTypeParameter(getTypeParameterFromMappedType(type)) || errorType);
        }
        function getNameTypeFromMappedType(type) {
            return type.declaration.nameType ?
                type.nameType || (type.nameType = instantiateType(getTypeFromTypeNode(type.declaration.nameType), type.mapper)) :
                undefined;
        }
        function getTemplateTypeFromMappedType(type) {
            return type.templateType ||
                (type.templateType = type.declaration.type ?