export type TransportCleanup = () => void;
export interface AbortSignalLike {
    readonly aborted: boolean;
    readonly reason?: unknown;
    addEventListener(type: 'abort', listener: () => void, options?: {
        once?: boolean;
    }): void;
    removeEventListener(type: 'abort', listener: () => void): void;
}
export interface TimerPlatform {
    setTimeout(handler: () => void, delayMs: number): unknown;
    clearTimeout(handle: unknown): void;
    now(): number;
}
export interface EventTargetLike {
    addEventListener?(type: string, listener: (event: unknown) => void): void;
    removeEventListener?(type: string, listener: (event: unknown) => void): void;
    on?(type: string, listener: (event: unknown) => void): void;
    off?(type: string, listener: (event: unknown) => void): void;
    removeListener?(type: string, listener: (event: unknown) => void): void;
}
export interface Utf8Codec {
    encode(value: string): Uint8Array;
    decode(value: ArrayBuffer | Uint8Array): string;
}
export declare class PortableAbortController {
    readonly signal: AbortSignalLike;
    abort(reason?: unknown): void;
}
export interface TransportOperationOptions {
    signal?: AbortSignalLike;
    timers?: TimerPlatform;
    timeoutMs?: number;
    abortError: (reason?: unknown) => unknown;
    timeoutError?: () => unknown;
}
export declare class CleanupStack {
    private cleanups;
    add(cleanup: TransportCleanup | undefined): TransportCleanup;
    flush(): void;
}
export declare function listen(target: EventTargetLike, type: string, listener: (event: unknown) => void): TransportCleanup;
export declare function canListen(target: EventTargetLike): boolean;
export declare function waitForTransportOperation<T>(operation: PromiseLike<T>, options: TransportOperationOptions): Promise<T>;
export declare function defaultTimerPlatform(): TimerPlatform;
export declare function copyArrayBuffer(value: ArrayBuffer | Uint8Array): ArrayBuffer;
export declare function encodeBase64(value: ArrayBuffer | Uint8Array): string;
export declare function decodeBase64(value: string): ArrayBuffer;
export declare function defaultUtf8Codec(): Utf8Codec;
export declare function eventPayload(event: unknown): unknown;
export declare function isRecord(value: unknown): value is Record<string, unknown>;
export declare function safeJsonParse(value: string): Record<string, unknown>;
export declare function safeJsonStringify(value: unknown): string;
export declare function abortReason(signal: AbortSignalLike | undefined): unknown;
export declare function onAbort(signal: AbortSignalLike | undefined, listener: () => void): TransportCleanup;