import { PostHogOptions } from 'posthog-node';
import { Adapter, ProviderData } from 'flags';

type JsonType = string | number | boolean | null | {
    [key: string]: JsonType;
} | Array<JsonType>;
interface PostHogEntities {
    distinctId: string;
}
/**
 * A PostHog adapter for the Flags SDK.
 *
 * Call it (or pass it uninvoked, e.g. `adapter: postHogAdapter`) to read a
 * flag's evaluated value. Use `.payload` to read the flag's attached payload
 * instead. Both forms participate in bulk evaluation via `evaluate()`.
 */
type PostHogAdapter = (<ValueType>() => Adapter<ValueType, PostHogEntities>) & {
    payload: <ValueType>() => Adapter<ValueType, PostHogEntities>;
};

declare function getProviderData(options: {
    personalApiKey: string;
    projectId: string;
    appHost?: string;
}): Promise<ProviderData>;

declare function createPostHogAdapter({ postHogKey, postHogOptions, }: {
    postHogKey: string;
    postHogOptions: PostHogOptions;
}): PostHogAdapter;
/**
 * Internal function for testing purposes
 */
declare function resetDefaultPostHogAdapter(): void;
/**
 * The default PostHog adapter, initialized lazily from environment variables on
 * first use. Pass it uninvoked (`adapter: postHogAdapter`) or invoked
 * (`adapter: postHogAdapter()`) to read a flag's value, or use
 * `postHogAdapter.payload` to read the flag's attached payload.
 */
declare const postHogAdapter: PostHogAdapter;

export { type JsonType, type PostHogEntities, createPostHogAdapter, getProviderData, postHogAdapter, resetDefaultPostHogAdapter };