/**
 * Emoji-injection pass for keyword captions.
 *
 * Submagic / CapCut have made the "💯 caption + 🔥 emoji" look the
 * default vibe of viral short-form. Rather than ship a static emoji
 * map, we ask the LLM (one call over ALL cues) for the single
 * most-fitting emoji per cue (or empty when nothing clearly fits).
 *
 * Pure-ish: takes the OpenAI-style chat client as a dependency so the
 * caller can swap in `fetch` directly OR mock it in tests.
 */
import type { AssCue } from "./ass.js";
export type EmojiDensity = "low" | "med" | "high";
export interface InjectEmojisOptions {
    density?: EmojiDensity;
    model?: string;
    apiKey?: string;
    signal?: AbortSignal;
    /** Override fetch — for tests. Defaults to global fetch. */
    fetchImpl?: typeof fetch;
}
export interface InjectEmojisResult {
    cues: AssCue[];
    /** Count of cues that received an emoji (excluding empty strings). */
    injected: number;
    /** When set, the LLM call failed and cues were returned unchanged. */
    error?: string;
}
/**
 * Inject emojis into a list of cues via one LLM call. On failure
 * (network down, malformed response, length mismatch) we return the
 * cues UNCHANGED + populate `error` so the caller can surface it.
 *
 * For density="high" the emoji is rendered on its own line ABOVE the
 * caption text (separated by ASS's `\\N` break) for the stacked CapCut
 * look. For low/med it's appended inline.
 */
export declare function injectEmojis(cues: AssCue[], opts?: InjectEmojisOptions): Promise<InjectEmojisResult>;
/**
 * Tolerant parser. Accepts either {emojis: [...]} or a bare array, pads
 * / truncates to `expected` length so length always lines up. Exported
 * for testing.
 */
export declare function parseEmojiResponse(content: string, expected: number): string[];
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