in src/printers.ts [110:120]
function printObject(type: GraphQLObjectType): string {
const interfaces = type.getInterfaces();
const implementedInterfaces = interfaces.length
? ' implements ' + interfaces.map((i) => i.name).join(' & ')
: '';
return (
printDescription(type) +
`type ${type.name}${implementedInterfaces}` +
printFields(type)
);
}