import type { BridgeChunk, BridgeDelta } from "./types.js";
export type ProtocolKind = "text" | "tool";
export type ProtocolEvent = {
    type: "block_start";
    kind: ProtocolKind;
} | {
    type: "block_delta";
    kind: ProtocolKind;
    delta: string;
} | {
    type: "block_end";
    kind: ProtocolKind;
} | {
    type: "metadata";
    metadata: BridgeDelta;
};
export declare function parseProtocol(source: AsyncIterable<BridgeChunk>, strict?: boolean): AsyncGenerator<ProtocolEvent>;