/**
 * `<encode as="...">` character conversions (spec §7.5).
 *
 * Each encoding takes a single character and returns a STRING. For base36,
 * ascii, and unicode that string is the *decimal* value of the character (so
 * `'A'` under base36 is `"10"`); for hex/binary/octal it is the code point
 * rendered in that base. Folds then consume the joined digits (spec §8).
 *
 * A "character" is one Unicode code point — strings are iterated by code point
 * elsewhere, so this stays consistent and portable (no reliance on JS
 * UTF-16 `charCodeAt`).
 */
export declare const ENCODINGS: readonly ["base36", "ascii", "unicode", "hex", "binary", "octal"];
export type Encoding = (typeof ENCODINGS)[number];
/** Return the single code point of `ch`, or error if it is not exactly one. */
export declare function codePointOf(ch: string): number;
/** Encode a single character under the named system, returning a string. */
export declare function encodeChar(ch: string, as: string): string;
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