/**
 * A turn must carry something the provider can act on.
 *
 * @remarks
 * MEASURED against two vendors, which reject the same underlying defect in two different ways —
 * one loudly, one silently:
 *
 *  - Mistral: HTTP 400, "Assistant message must have either content or tool_calls, but not none."
 *  - Gemini: a request whose FINAL `model` turn carries only a `thought: true` part comes back
 *    `finishReason: MALFORMED_RESPONSE` with no content — measured 4 of 4, against STOP-with-text
 *    when the identical history ends on the user turn instead.
 *
 * A thought alone does not satisfy the rule; that is precisely the shape Gemini refuses. The two
 * variants differ only in scope, so the factory takes it: Gemini's constraint is terminal-position
 * specific, Mistral's applies to any assistant turn in the history.
 */
import type { OrderingProfile } from "../types";
/**
 * @param onlyTerminal - Check only the final turn (Gemini) rather than every one (Mistral).
 * @param role - Which role's turns are constrained.
 */
export declare const nonEmptyTurn: (onlyTerminal?: boolean, role?: "assistant" | "user") => OrderingProfile;