/**
 * Widget utilities.
 *
 * Deliberately absent: any reading of ambient page state as a credential.
 * The widget once pulled `localStorage.API_KEY`, `localStorage.ORG_ID` and
 * `localStorage.accessToken` into every request, and stamped
 * `x-request-from: internal`. That let the embedding page choose its own
 * organization context and pass an external request off as an internal one.
 * Credentials now come only from explicit SDK configuration, through the
 * `onRequest` hook — see src/widget/services/toruk-client.ts.
 */
/**
 * Read a recorded Blob as a `data:audio/...;base64,...` URI.
 *
 * That is the shape Core's transcribe route validates (`@Matches(/^data:audio\//)`),
 * and FileReader is the only way to get it without hand-rolling base64 over an
 * ArrayBuffer — which for a multi-megabyte clip risks blowing the argument limit
 * on `String.fromCharCode.apply`.
 */
/**
 * Force a data URI to declare an audio type.
 *
 * Core's transcribe DTO validates `/^data:audio\//`, and `FileReader` derives the
 * prefix from `blob.type` — so a Blob with no type produces
 * `data:application/octet-stream` and a 400 that says nothing about the real
 * problem. The recorder now always tags its output, but this is the last line of
 * defence: the bytes are known to be a recording, so relabelling is safe and a
 * silent rejection is not.
 */
export declare const asAudioDataUri: (dataUri: string, fallbackMime?: string) => string;
export declare const blobToDataUri: (blob: Blob) => Promise<string>;
/**
 * One readable line describing what a human-input form answered.
 *
 * This becomes the user's visible message when a form resumes a run — the
 * structured `formData` travels separately to the engine. Mirrors Core's
 * `summarizeFormData`, including masking a secret: only this string is shown and
 * persisted, so a credential must not appear in it.
 */
export declare const summarizeHumanInput: (formData: {
    value?: string | string[];
} | undefined, interactionType?: string) => string;
export declare const isNotDefined: <T>(value: T | null | undefined) => value is null | undefined;
/**
 * URL for a file the deployment stored during the conversation.
 *
 * Rendered directly into `<img src>` / `<audio src>`, so it can carry no
 * headers — and deliberately no credential either. It used to append
 * `?apikey=` from `localStorage.API_KEY`; that both relied on ambient page
 * state and put a deployment key in the DOM and the browser's network log.
 * Uploads therefore resolve for public deployments; a private deployment
 * needs a host-issued URL instead of a browser-exposed secret.
 */
export declare const buildUploadUrl: (apiHost: string | undefined, deploymentId: string, chatId: string, fileName: string) => string;
export declare const isDefined: <T>(value: T | null | undefined) => value is NonNullable<T>;
export declare const isEmpty: (value: string | undefined | null) => value is undefined;
export declare const isNotEmpty: (value: string | undefined | null) => value is string;
/**
 */
export declare const formatRelativeTime: (value?: string | null) => string;
/**
 * localStorage scope for a widget instance. Preview mounts (deployment wizard
 * Review step) get a `preview:`-prefixed scope so trial chats never pollute the
 * real widget's persisted history for the same deploymentId.
 */
export declare const storageScopeId: (deploymentId: string, previewMode?: boolean) => string;
/**
 * The widget's entire local state, and the only keys it is allowed to hold.
 *
 * TORUK Core owns sessions, titles, messages and deletion state. The widget
 *
 * `chatHistory`, a per-chat message array and a session list all used to live
 * here. They are gone: a second copy of Core's data drifts from it, and its
 * presence tempted the widget into silently serving stale local history
 * whenever an API call failed.
 */
export type WidgetLocalState = {
    lead?: Record<string, any>;
};
export declare const setLocalStorageChatflow: (deploymentId: string, saveObj?: Record<string, any>) => void;
export declare const getLocalStorageChatflow: (deploymentId: string) => WidgetLocalState;
export declare const getBubbleButtonSize: (size: 'small' | 'medium' | 'large' | number | undefined) => number;
export declare const setCookie: (cname: string, cvalue: string, exdays: number) => void;
export declare const getCookie: (cname: string) => string;