Interface SchemaIntrospector

interface SchemaIntrospector {
    asOptionalField(
        typeName: string | string[],
        fieldName: string,
        specifier?: string,
    ): string;
    isTypeDefined(typeName: string): boolean;
    queryTypeDefined(queryType: string): boolean;
    typeHasField(typeName: string, fieldName: string): boolean;
    typeHasInputField(typeName: string, fieldName: string): boolean;
}