import type { FeatureFlag } from "../types.js";
import { AppConfigurationClientLite } from "../client.js";
/**
 * A lightweight representation of Azure AppConfigurationClient.
 * @internal
 * {@link import("@azure/app-configuration").AppConfigurationClient}
 */
export type AppConfigurationClient = {
    listConfigurationSettings: (options?: FeatureFlagServiceOptions) => ListConfigurationSettingsResult;
    getConfigurationSetting: (settingId: SettingId, options?: FeatureFlagServiceOptions) => Promise<ConfigurationSetting>;
    setConfigurationSetting: (configurationSetting: ConfigurationSetting, options?: FeatureFlagServiceOptions) => Promise<ConfigurationSetting>;
    deleteConfigurationSetting: (settingId: SettingId, options?: FeatureFlagServiceOptions) => Promise<unknown>;
};
type SettingId = {
    etag?: string;
    key: string;
    label?: string;
};
type ListConfigurationSettingsResult = {
    next(): Promise<{
        done?: boolean;
        value: ConfigurationSetting;
    }>;
    [Symbol.asyncIterator](): ListConfigurationSettingsResult;
};
/**
 * Representation of a entry (setting) in  Azure App Configuration
 */
export type ConfigurationSetting = {
    etag?: string | undefined;
    key: string;
    label?: string | undefined;
    contentType?: string | undefined;
    tags?: {
        [propertyName: string]: string;
    } | undefined;
    value?: string | undefined;
    isReadOnly: boolean;
    lastModified?: Date | undefined;
};
/**
 * Options for get all feature flags as record or list
 */
export type FeatureFlagServiceOptions = {
    acceptDateTime?: Date;
    labelFilter?: string;
    abortSignal?: AbortSignal;
};
/**
 * Options for a feature flag by key
 */
export type FeatureFlagServiceWithKeyOptions = FeatureFlagServiceOptions & {
    keyFilter: string;
};
export declare function invariantAppConfigurationClient(client: unknown, method: keyof AppConfigurationClient): asserts client is AppConfigurationClient;
export declare function iterateAppConfigurationFeatureFlags(client: AppConfigurationClient | AppConfigurationClientLite, options: FeatureFlagServiceOptions | undefined, onFound: (flag: FeatureFlag) => void): Promise<void>;
export declare function extractFeatureFlagFromSetting(setting: ConfigurationSetting): FeatureFlag;
/**
 * The content type for a FeatureFlag
 */
export declare const featureFlagContentType = "application/vnd.microsoft.appconfig.ff+json;charset=utf-8";
/**
 * The prefix for feature flags.
 */
export declare const featureFlagPrefix = ".appconfig.featureflag/";
/**
 * Lets you know if the ConfigurationSetting is a feature flag.
 *
 * [Checks if the content type is featureFlagContentType `"application/vnd.microsoft.appconfig.ff+json;charset=utf-8"`]
 */
export declare function isFeatureFlagSetting(setting: ConfigurationSetting): setting is ConfigurationSetting & Required<Pick<ConfigurationSetting, "value">>;
export {};