interface AbortSignalEventTargetAddOptions { once: boolean; } export interface AbortSignalEventTarget { addEventListener: (name: 'abort', listener: () => void, options?: AbortSignalEventTargetAddOptions) => void; removeEventListener: (name: 'abort', listener: () => void) => void; aborted?: boolean; reason?: unknown; } export interface AbortSignalEventEmitter { off: (name: 'abort', listener: () => void) => void; once: (name: 'abort', listener: () => void) => void; } export type AbortSignalAny = AbortSignalEventTarget | AbortSignalEventEmitter; export declare class AbortError extends Error { constructor(reason?: AbortSignalEventTarget['reason']); get name(): string; } export declare function onabort(abortSignal: AbortSignalAny, listener: () => void): void; export {};