import { type ThemeKey, type ThemeAsset } from './themes.js';
import type { QrConfigDefaults } from './config.js';
export interface ComposeOptions {
    width: number;
    errorCorrectionLevel: 'L' | 'M' | 'Q' | 'H';
    darkColor: string;
    lightColor: string;
    theme: ThemeKey | 'random' | 'none' | {
        svg: string;
        label?: string;
    };
    themePool: ThemeKey[];
    framePadding: number;
    centerWhiteRatio: number;
    themeOpacity: number;
    themeColor: string;
}
/**
 * Résout la prop `theme` en thème concret.
 * - 'random' → tire dans themePool
 * - 'none'   → null (caller doit fallback sur QR pur)
 * - { svg }  → thème inline custom
 * - clé      → thème natif via registry
 */
export declare function resolveTheme(theme: ComposeOptions['theme'], pool: ThemeKey[]): ThemeAsset | null;
/**
 * Génère le SVG composite (theme frame + center white card + QR).
 * Si theme='none', retourne null — le caller doit fallback sur le QR pur.
 */
export declare function composeThemedSvg(text: string, opts: ComposeOptions): Promise<string | null>;
/**
 * Génère le PNG composite via @resvg/resvg-js.
 * Si theme='none', retourne null — le caller doit fallback.
 */
export declare function composeThemedPng(text: string, opts: ComposeOptions): Promise<Buffer | null>;
/**
 * Génère un Data URL PNG du composite.
 * Si theme='none', retourne null — le caller doit fallback.
 */
export declare function composeThemedDataUrl(text: string, opts: ComposeOptions): Promise<string | null>;
/** Helper de merge config + opts pour les fonctions de génération. */
export declare function mergeComposeOpts(cfg: QrConfigDefaults, opts?: Partial<ComposeOptions>): ComposeOptions;
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