/**
 * Normalize a single value, sync iterable, or async iterable into an async iterable.
 *
 * NOTE: `string` and `Uint8Array` are treated as single scalar values even though
 * both implement `Symbol.iterator`. External table data is `string | Uint8Array |
 * AsyncIterable`, so yielding them whole is the correct contract.
 */
export declare function toAsyncIterable<T>(input: T | Iterable<T> | AsyncIterable<T>): AsyncIterable<T>;
/** Lazily map an async iterable. Forwards early `return()` to the source. */
export declare function mapAsync<T, U>(input: AsyncIterable<T>, fn: (item: T) => U): AsyncGenerator<U>;
/**
 * Push an item to the front of an async iterator.
 * Useful when we peek the first item, do some operation on it, and then
 * iterate over the entire collection including that first item.
 */
export declare function prepend<T>(first: T, rest: AsyncIterator<T> | Iterator<T>): AsyncGenerator<T>;
/**
 * Iterate a ReadableStreamDefaultReader as chunks.
 * Does NOT cancel/release on exit — callers own the reader lifecycle.
 */
export declare function readChunks(reader: ReadableStreamDefaultReader<Uint8Array>): AsyncGenerator<Uint8Array>;
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