/**
 * W3C-defined iframe sandbox tokens accepted by the lightning-embedding wrapper template.
 * Exposed so CLI plugins can derive their flag `options` list from a single source of truth.
 */
export declare const LIGHTNING_EMBEDDING_SANDBOX_TOKENS: readonly ["allow-forms", "allow-modals", "allow-orientation-lock", "allow-pointer-lock", "allow-popups", "allow-popups-to-escape-sandbox", "allow-presentation", "allow-same-origin", "allow-scripts", "allow-storage-access-by-user-activation", "allow-top-navigation", "allow-top-navigation-by-user-activation"];
export type LightningEmbeddingSandboxToken = (typeof LIGHTNING_EMBEDDING_SANDBOX_TOKENS)[number];
/**
 * Returns true if `src` is an absolute URL acceptable as the iframe source on the
 * lightning-embedding wrapper. https is accepted everywhere; plain http is permitted
 * only for localhost / 127.0.0.1 to support local development servers.
 */
export declare function isAllowedLightningEmbeddingSrcUrl(src: string): boolean;