type FN = (...args: any[]) => any;
type MessageExec = {
    type: 'exec';
    method: string;
    args: unknown[];
};
type MessageLog = {
    type: 'log';
    value: string;
};
type MessageReady = {
    type: 'ready';
};
type MessageResultSuccess = {
    type: 'result';
    value: unknown;
};
type MessageResultError = {
    type: 'result';
    error: {
        name: string;
        message: string;
        stack: string;
    };
};
type MessageResult = MessageResultSuccess | MessageResultError;
type Message = MessageExec | MessageLog | MessageReady | MessageResult;
type Methods = Record<string, FN>;
type MethodsNames<T extends Methods> = keyof T extends string ? keyof T : never;
type MethodsFunctions<T extends Methods> = T[keyof T];
type MethodsProxied<T extends Methods> = {
    [K in Exclude<keyof T, 'then'>]: (...args: Parameters<T[K]>) => Promise<Awaited<ReturnType<T[K]>>>;
};
type MethodFunction<T extends Methods, U extends MethodsNames<T>> = T[U];
type MethodArguments<T extends Methods, U extends MethodsNames<T>> = Parameters<MethodFunction<T, U>>;
type MethodReturn<T extends Methods, U extends MethodsNames<T>> = ReturnType<MethodFunction<T, U>>;
type MethodProxied<T extends FN> = (...args: Parameters<T>) => Promise<Awaited<ReturnType<T>>>;
type Env = Partial<{
    [key: string]: string;
}>;
type ExecOptions = {
    signal?: AbortSignal;
    timeout?: number;
    transfer?: Transferable[];
};
type Options<T extends Methods> = {
    pool?: {
        name?: string;
        size?: number;
    };
    worker: {
        autoAbort?: number;
        autoInstantiate?: boolean;
        autoTerminate?: number;
        env?: Env;
        methods: T | URL | string;
    };
};
type Stats = {
    tasks: {
        busy: number;
        idle: number;
        total: number;
    };
    workers: {
        busy: number;
        idle: number;
        total: number;
    };
};
type Task<T extends Methods, U extends MethodsNames<T> = MethodsNames<T>> = {
    method: U;
    args: MethodArguments<T, U>;
    signal?: AbortSignal;
    timeout: number;
    transfer?: Transferable[];
    promise: Promise<Awaited<MethodReturn<T, U>>>;
    resolve: (result: MethodReturn<T, U>) => void;
    reject: (error: Error) => void;
};
export type { MessageExec, MessageLog, MessageReady, MessageResult, Message };
export type { Methods, MethodsNames, MethodsFunctions, MethodsProxied, MethodFunction, MethodArguments, MethodReturn, MethodProxied };
export type { Env, ExecOptions, Options, Stats, Task };