/**
 * Accepted binary data types for concat
 *
 * @internal
 */
export type ConcatSource = ReadableStream<Uint8Array> | NodeJS.ReadableStream | Uint8Array | Blob;
/**
 * Utility function that concatenates a set of binary inputs into one combined output.
 *
 * React Native runs on the Hermes engine, which implements a subset of web
 * APIs with narrower type contracts than full browsers:
 *
 * - **Blob**: natively supported, but its constructor only accepts
 *   `(Blob | string)[]` — NOT the full `BlobPart[]` union. Passing a
 *   `Uint8Array` to `new Blob([uint8])` throws at runtime.
 *   See https://github.com/facebook/react-native/issues/44125
 *
 * - **Uint8Array**: works as a data type, but cannot be passed to the Blob
 *   constructor without a polyfill (e.g. react-native-blob-jsi-helper).
 *   See https://github.com/facebook/react-native/issues/41079
 *
 * - **ReadableStream / Response**: not available by default. Apps can polyfill
 *   these (e.g. web-streams-polyfill + react-native-fetch-api).
 *
 * This implementation handles all source types and defers to the runtime,
 * so apps with the appropriate polyfills get correct behavior while apps
 * without them get the engine's native error.
 *
 * @param sources - array of sources for the concatenation
 * @returns a `Blob` representing all the concatenated inputs.
 *
 * @internal
 */
export declare function concat(sources: (ConcatSource | (() => ConcatSource))[]): Promise<(() => NodeJS.ReadableStream) | Blob>;
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