/** Mirrors Platform CustomIframe.ENABLED — keep in sync when either side changes */
export declare const CUSTOM_IFRAME_URL_REGEX: RegExp;
/**
 * Slash-menu check. The pasted URL does not need `?customIframe=true`.
 * That flag stays on CUSTOM_IFRAME_URL_REGEX, which auto-detects bare markdown links.
 * Host rules match that regex after the flag is added to a throwaway copy.
 */
export declare function isValidSlashIframeUrl(raw: string): boolean;
export declare const iframeProvider: import('../types').EmbedDefinition;