import { IOHandler, LoadOptions, ModelArtifacts, ModelArtifactsInfo, ModelJSON, OnProgressCallback } from "@tensorflow/tfjs-core/dist/io/types";
export declare class JSONHandler implements IOHandler {
    json: ModelJSON;
    path: string;
    weightPathPrefix: string;
    requestInit: RequestInit;
    fetch: typeof fetch;
    onProgress: OnProgressCallback;
    weightUrlConverter: ((path: string) => Promise<string>) | null;
    constructor(json: ModelJSON);
    load(): Promise<ModelArtifacts>;
    private loadWeights;
}
/**
 * Extract the prefix and suffix of the url, where the prefix is the path before
 * the last file, and suffix is the search params after the last file.
 * ```
 * const url = 'http://tfhub.dev/model/1/tensorflowjs_model.pb?tfjs-format=file'
 * [prefix, suffix] = parseUrl(url)
 * // prefix = 'http://tfhub.dev/model/1/'
 * // suffix = '?tfjs-format=file'
 * ```
 * @param url the model url to be parsed.
 */
export declare function parseUrl(url: string): [string, string];
/**
 * Calculate the byte length of a JavaScript string.
 *
 * Note that a JavaScript string can contain wide characters, therefore the
 * length of the string is not necessarily equal to the byte length.
 *
 * @param str Input string.
 * @returns Byte length.
 */
export declare function stringByteLength(str: string): number;
/**
 * Populate ModelArtifactsInfo fields for a model with JSON topology.
 * @param modelArtifacts
 * @returns A ModelArtifactsInfo object.
 */
export declare function getModelArtifactsInfoForJSON(modelArtifacts: ModelArtifacts): ModelArtifactsInfo;
/**
 * Concatenate a number of ArrayBuffers into one.
 *
 * @param buffers A number of array buffers to concatenate.
 * @returns Result of concatenating `buffers` in order.
 */
export declare function concatenateArrayBuffers(buffers: ArrayBuffer[]): ArrayBuffer;
/**
 * Reads binary weights data from a number of URLs.
 *
 * @param fetchURLs URLs to send the HTTP requests at, using `fetch` calls.
 * @param requestOptions RequestInit (options) for the HTTP requests.
 * @param fetchFunc Optional overriding value for the `window.fetch` function.
 * @param onProgress Optional, progress callback function, fired periodically
 *   before the load is completed.
 * @returns A `Promise` of an Array of `ArrayBuffer`. The Array has the same
 *   length as `fetchURLs`.
 */
export declare function loadWeightsAsArrayBuffer(fetchURLs: string[], loadOptions?: LoadOptions): Promise<ArrayBuffer[]>;