/**
 * Listeners by channel name, for a transport that receives every message on
 * one hook and has to hand each to whoever listens on its channel. One
 * listener throwing never keeps the message from the rest: a page runtime
 * and a DevTools host both hold listeners they did not write.
 */
export interface ChannelListeners {
    /** Listen on `channel`. Returns the function that removes the listener. */
    readonly on: (channel: string, handler: (data: unknown) => void) => () => void;
    /** Hand `data` to every listener on `channel`. */
    readonly emit: (channel: string, data: unknown) => void;
}
export declare const channelListeners: () => ChannelListeners;
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