/**
 * A `<mix>` for the streaming engines.
 *
 * Split out of `stream-build.ts` when that file reached its line ceiling, on a
 * seam that was already there: a mix is the one construct whose value is chosen
 * by a whole-run percentage layout and then ASSEMBLED from a case body, so it
 * needs its own resolver rather than the per-column draw the rest of the file
 * describes.
 */
import type { SequenceBuildOptions } from './build.js';
import { type Domain } from './stream-build.js';
import type { MixSpec, Sequence } from './types.js';
/**
 * `<mix>` in stream mode: pick a case for row `i` by exact percentage (a
 * Feistel quota plan, like `text`), then assemble that case's parts at row `i`
 * (data literal, gen via a per-row seekable draw, nested mix recursively).
 * A nested mix distributes over its OUTER case's subset — the same subset
 * bijection as parent-child — so exact sub-percentages nest to any depth.
 */
export declare function buildMixSeq(streamId: string, mixSpec: MixSpec, domain: Domain, seed: string, locale: string, now: number, options: SequenceBuildOptions): {
    sequence: Sequence;
    flag?: {
        name: string;
        sequence: Sequence;
    };
};
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