/** Resolves an encoding alias to the spelling Node reports, or `undefined` if unknown. */
export declare function normalizeEncoding(encoding?: string | null): BufferEncoding | undefined;
/**
 * Decodes byte chunks into strings without splitting multi-byte characters across chunks.
 *
 * `utf8` uses a streaming `TextDecoder`. `utf16le` is handled here instead, because Node
 * drops a trailing odd byte and preserves lone surrogates where the WHATWG decoder replaces
 * both with U+FFFD. The remaining encodings only need their fixed-size groups buffered.
 */
export declare class StringDecoder {
    #private;
    readonly encoding: BufferEncoding;
    constructor(encoding?: string | null);
    write(buf: string | ArrayBufferView): string;
    end(buf?: string | ArrayBufferView): string;
}