import { Disposable } from '@typed/disposable';
import { Arity1, IO } from '@typed/lambda';
/**
 * Generic Clock interface used to get the current time
 */
export interface Clock {
    readonly currentTime: IO<number>;
}
/**
 * An extension of Clock useful for testing
 */
export interface VirtualClock extends Clock {
    readonly progressTimeBy: (delayMS: number) => void;
}
/**
 * An extension of Clock used for scheduling delayed tasks.
 */
export interface Timer extends Clock {
    readonly delay: (fn: Arity1<number, Disposable>, delayMs: number) => Disposable;
}
/**
 * An extension of Timer useful for testing
 */
export interface VirtualTimer extends Timer, VirtualClock {
}
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