/**
 * Which environment the app is running in, as the sandbox image tag needs it.
 *
 * ★ Generic, not a product answer: every consumer's Vite build defines
 * `VITE_APP_ENV`. `images.ts` deliberately takes `isProd` as an argument so a
 * product CAN pin it; this is the default for the common case, so the panel
 * needs no seam field for something the environment already knows.
 */
export declare function isProdRuntime(): boolean;
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