export type SchedulerState = "queued" | "running" | "success" | "error" | "aborted";
export declare const DEFAULT_MAX_CONCURRENCY = 5;
export interface ScheduledTask<T> {
    id: string;
    provider?: string;
    run: (lease: ProviderLease) => Promise<T>;
}
export interface ProviderLease {
    readonly provider: string | undefined;
    switchTo(provider: string | undefined, signal?: AbortSignal): Promise<void>;
}
export declare function scheduleTasks<T>(args: {
    tasks: ScheduledTask<T>[];
    maxConcurrency: number;
    providerLimits?: Record<string, number>;
    signal?: AbortSignal;
    onState?: (id: string, state: SchedulerState) => void;
}): Promise<Array<PromiseSettledResult<T>>>;