import { SpinWaitLock } from "../spin-wait-lock/spin-wait-lock";
/**
 * A type that can be serialized.
 */
export type Serializable = string | number | boolean | Serializable[] | {
    [key: string]: Serializable;
};
export interface InvocationResult<Treturn> {
    result?: Treturn;
    state: "success" | "error:queue-empty" | "error:queue-full";
}
/**
 * A class that allows for the sequential invocation of a function.
 */
export declare class SequentialInvocationQueue<Targs extends Serializable, Treturn extends Serializable | void> {
    private readonly lock;
    private readonly invocationFunction;
    private readonly maxQueueLength;
    private readonly invocationQueue;
    /**
     * @param lock The lock to used for synchronization.
     * @param invocationFunction The function to invoke.
     * @param maxQueueLength The maximum length of the queue.
     */
    constructor(lock: SpinWaitLock, invocationFunction: (args: Targs) => Promise<Treturn>, maxQueueLength?: number);
    /**
     * Invokes the function with the given arguments, if an execution is already underway en-ques the current invocation.
     * @param args The arguments to pass to the invocationFunction.
     * @param spinTime The time to wait between attempts to acquire the lock.
     * @param index The index to replace in the queue, if an execution is already active.
     * @returns A promise that resolves to the result of the invocation.
     */
    invoke(args: Targs, spinTime?: number, index?: number | undefined): Promise<InvocationResult<Treturn>>;
    /**
     * Deletes the invocation at the given index.
     * @param index The index of the invocation to delete.
     * @returns void
     */
    delete(index: number): void;
    /**
     * Returns an iterator for the invocation queue.
     * @returns An iterator for the invocation queue.
     * @example
     * ```typescript
     * const invocationQueue = new SequentialInvocationQueue<number[], void>(new SpinWaitLock(), sensitiveWork);
     * invocationQueue.invoke([undefined, 0]);
     * invocationQueue.invoke([undefined, 1]);
     * invocationQueue.invoke([undefined, 2]);
     * for (const invocation of invocationQueue) {
     *    console.log(invocation);
     * }
     * ```
     */
    [Symbol.iterator](): IterableIterator<Targs>;
    /**
     * Clears the invocation queue.
     * @returns void
     */
    clear(): void;
    [Symbol.asyncDispose](): void;
}