/**
 * Compare two byte arrays for equality
 */
export declare function bytesEqual(left: Uint8Array, right: Uint8Array): boolean;
/**
 * Find index of one byte array in another
 */
export declare function indexOf(haystack: Uint8Array, needle: Uint8Array): number;
/**
 * Split a stream of bytes
 *
 * Takes a stream of data modeled as an async iterator of ArrayBuffer for
 * compatibility between node and web, and splits it into an async iterator
 * where each value is delimited by the split sequence.
 */
export declare function splitStream(iter: AsyncIterable<Uint8Array>, split: Uint8Array): AsyncIterableIterator<Uint8Array>;
/**
 * collect an async iterable of buffers into one
 */
export declare function collect(stream: AsyncIterable<Uint8Array>): Promise<Uint8Array>;
/**
 * decoder for quoted printable
 *
 * If quoted printable "lines" aren't escaped with an "=" then a new line needs
 * to be inserted. We use `newLine` which defaults to a single "\n".
 */
export declare function decodeQuotedPrintable(lines: AsyncIterable<Uint8Array>, newLine?: Uint8Array): AsyncIterableIterator<Uint8Array>;
/**
 * decoder for base64
 */
export declare function decodeBase64(lines: AsyncIterable<Uint8Array>): AsyncIterableIterator<Uint8Array>;
/**
 * decoder for 7bit and 8bit
 */
export declare function decodeIdentity(lines: AsyncIterable<Uint8Array>): AsyncIterableIterator<Uint8Array>;
/**
 * decoder for binary
 *
 * For implementation reasons, binary can't be supported, so we throw a special
 * error.
 */
export declare function decodeBinary(): never;