export interface AdGroupOperatingSystem {
    /** Lowest OS version targeted, such as `18.0`. Absent when any version qualifies. */
    minimum_version?: string | undefined;
    /** Operating system targeted. */
    os: AdGroupOperatingSystem.Os;
}
export declare namespace AdGroupOperatingSystem {
    /** Operating system targeted. */
    const Os: {
        readonly Ios: "ios";
        readonly Android: "android";
    };
    type Os = (typeof Os)[keyof typeof Os];
}