export declare const BUILTIN_CHARSETS: Readonly<Record<string, string>>;
export interface ResolvedCharset {
    name: string;
    glyphs: string[];
}
/**
 * Resolve a built-in charset name or custom characters into glyphs (ALGORITHM.md §12). A string
 * is split into grapheme clusters; an array's elements are taken whole, one glyph each, which is
 * how to give a glyph a segmenter would split or join differently — a letter with a ZERO WIDTH
 * JOINER before it, say. Duplicates are an error (spec §43).
 */
export declare function resolveCharset(charset?: string, characters?: string | readonly string[]): ResolvedCharset;