interface _WebRequestOnBeforeSendHeadersEvent<
    TCallback = (
        details: _OnBeforeSendHeadersDetails,
    ) => BlockingResponse | Promise<BlockingResponse> | void,
> {
    addListener(
        cb: TCallback,
        filter: RequestFilter,
        extraInfoSpec?: OnBeforeSendHeadersOptions[],
    ): void;
    hasListener(cb: TCallback): boolean;
    removeListener(cb: TCallback): void;
}