/**
 * Turn workflow input migrations.
 *
 * The driver workflow can stay pinned while per-turn child workflows
 * route to latest, so the child workflow run input is a durable wire
 * shape newer code must read. Inputs written before
 * {@link TURN_WORKFLOW_INPUT_VERSION} carry no `version`; the chain reads
 * them as version 0 and the registered v0 → v1 migration lifts the flat
 * shape into the current input, so a turn dispatched by an older
 * deployment still runs after a rollout. Future shape changes bump
 * {@link TURN_WORKFLOW_INPUT_VERSION} and append a v{N} → v{N+1} migration.
 */
import type { HookPayload, SessionCapabilities } from "#channel/types.js";
import type { DurableSessionState } from "#execution/durable-session-store.js";
import type { RunMode } from "#shared/run-mode.js";
export declare const TURN_WORKFLOW_INPUT_VERSION = 1;
export interface TurnStepInput {
    readonly input: HookPayload | undefined;
    readonly parentWritable: WritableStream<Uint8Array>;
    readonly serializedContext: Record<string, unknown>;
    readonly sessionState: DurableSessionState;
}
export interface TurnWorkflowInput {
    readonly version: typeof TURN_WORKFLOW_INPUT_VERSION;
    readonly capabilities: SessionCapabilities | undefined;
    readonly completionToken: string;
    readonly mode: RunMode;
    readonly stepInput: TurnStepInput;
}
export interface TurnWorkflowDispatchInput {
    readonly capabilities: SessionCapabilities | undefined;
    readonly completionToken: string;
    readonly delivery: HookPayload;
    readonly mode: RunMode;
    readonly parentWritable: WritableStream<Uint8Array>;
    readonly serializedContext: Record<string, unknown>;
    readonly sessionState: DurableSessionState;
}
export declare function createTurnWorkflowInput(input: TurnWorkflowDispatchInput): TurnWorkflowInput;
export declare function migrateTurnWorkflowInput(value: unknown): TurnWorkflowInput;