/* Declarations for lib/hangul.js — the module itself ships unchanged. */

export const CHO: string;
export const JUNG: string;
export const JONG: string;

/** [initialIndex, medialIndex, finalIndex], or null if not a syllable block. */
export function decompose(ch: string): [number, number, number] | null;
export function compose(i: number, m: number, f?: number): string;

export const isJamo: {
  initial(c: string): boolean;
  medial(c: string): boolean;
  final(c: string): boolean;
};

/**
 * A 두벌식 IME. Hold one per input: feed jamo with key(), literal text with
 * text(), Backspace with back(). Each call returns the full new value.
 */
export class Composer {
  cho: string | null;
  jung: string | null;
  jong: string | null;
  reset(): void;
  readonly empty: boolean;
  /** The syllable currently being assembled, as text. */
  render(): string;
  key(value: string, jamo: string): string;
  back(value: string): string;
  /** Commit the buffer and append literal text (space, punctuation). */
  text(value: string, t: string): string;
}

export const KEYBOARD: {
  rows: string[][];
  shift: Record<string, string>;
};