in src/printers.ts [64:85]
function printFilteredSchema(
schema: GraphQLSchema,
directiveFilter: (type: GraphQLDirective) => boolean,
typeFilter: (type: GraphQLNamedType) => boolean,
): string {
const directives = schema.getDirectives().filter(directiveFilter);
const typeMap = schema.getTypeMap();
const types = objectValues(typeMap)
.sort((type1, type2) => type1.name.localeCompare(type2.name))
.filter(typeFilter);
return (
[printSchemaDefinition(schema)]
.concat(
directives.map((directive) => printDirective(directive)),
types.map((type) => printType(type)),
)
.filter(Boolean)
.join('\n\n') + '\n'
);
}