/**
 * All available encodings.
 *
 *  * `'ascii'` - For 7-bit ASCII data only. This encoding is fast and will strip the high bit if set.
 *  * `'utf8'` - Multibyte encoded Unicode characters. Many web pages and other document formats use UTF-8.
 *  * `'utf16le'` - 2 or 4 bytes, little-endian encoded Unicode characters. Surrogate pairs (U+10000 to U+10FFFF) are supported.
 *  * `'ucs2'` - Alias of 'utf16le'.
 *  * `'base64'` - Base64 encoding. When creating a Buffer from a string, this encoding will also correctly accept "URL and Filename
 *      Safe Alphabet" as specified in RFC4648, Section 5.
 *  * `'latin1'` - A way of encoding the Buffer into a one-byte encoded string (as defined by the IANA in RFC1345, page 63, to be
 *      the Latin-1 supplement block and C0/C1 control codes).
 *  * `'binary'` - Alias for 'latin1'.
 *  * `'hex'` - Encode each byte as two hexadecimal characters.
 *
 * > List from
 * > https://nodejs.org/docs/latest-v10.x/api/buffer.html#buffer_buffers_and_character_encodings
 */
export declare type Encoding = "ascii" | "utf8" | "utf16le" | "ucs2" | "base64" | "latin1" | "binary" | "hex";
/** Ensures if `check` is one of the supported `Encoding`s. */
export declare function isEncoding(check: string): check is Encoding;