/**
 * The `Turn` handed to a worker handler — the entire surface a builder touches:
 * the pushed context (`input`/`identity`/`fs`/`history`) plus `text()` to stream.
 * Nothing Guuey-specific beyond this.
 */
import type { Fs, HistoryMessage, Identity } from "./protocol.js";
import type { Emitter } from "./emit.js";
export declare class Turn {
    readonly input: string;
    readonly identity: Identity;
    readonly fs: Fs;
    readonly history: HistoryMessage[];
    private readonly emit;
    private readonly onText;
    constructor(input: string, identity: Identity, fs: Fs, history: HistoryMessage[], emit: Emitter, onText: (chunk: string) => void);
    /** Stream a chunk of assistant output (also accumulated into `done.result`). */
    text(chunk: string): void;
}
/** A worker handler: do the work, return the final result string (or rely on the
 *  accumulated `turn.text(...)`). */
export type WorkerHandler = (turn: Turn) => Promise<string | void> | string | void;
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