export type Metadata = {
    TRIGGER_RUN_ID: string | undefined;
    TRIGGER_SNAPSHOT_ID: string | undefined;
    TRIGGER_SUPERVISOR_API_PROTOCOL: string | undefined;
    TRIGGER_SUPERVISOR_API_DOMAIN: string | undefined;
    TRIGGER_SUPERVISOR_API_PORT: number | undefined;
    TRIGGER_WORKER_INSTANCE_NAME: string | undefined;
    TRIGGER_HEARTBEAT_INTERVAL_SECONDS: number | undefined;
    TRIGGER_SNAPSHOT_POLL_INTERVAL_SECONDS: number | undefined;
    TRIGGER_SUCCESS_EXIT_CODE: number | undefined;
    TRIGGER_FAILURE_EXIT_CODE: number | undefined;
    TRIGGER_RUNNER_ID: string | undefined;
};
export declare class MetadataClient {
    private readonly url;
    constructor(url: string);
    getEnvOverrides(): Promise<[error: Error, data: null] | [error: null, data: Metadata]>;
}