declare type Callback = (event: Event) => void;
declare class Emitter {
    private readonly listeners;
    constructor();
    addEventListener(type: string, callback: Callback): void;
    removeEventListener(type: string, callback: Callback): void;
    dispatchEvent(event: Event): void;
}
export declare class AbortSignal extends Emitter {
    aborted: boolean;
    onabort: ((event: Event) => void) | null;
    constructor();
    toString(): string;
    dispatchEvent(event: Event): void;
}
export declare class AbortController {
    readonly signal: AbortSignal;
    constructor();
    abort(): void;
    toString(): string;
}
export {};