import type { AsciiProfile } from './types.js';
/**
 * Derive a profile restricted to `characters` from an already-built profile —
 * compiled or runtime — preserving each glyph's raster data exactly (mask,
 * coverage, atlas tile). Matching against the subset behaves identically to a
 * profile compiled with that charset: glyph ids follow the given character
 * order, so all id-order tie-breaks carry over.
 *
 * shape6 vectors are carried; a shape6 LUT is dropped (its entries are argmins
 * over the parent charset), so shape6 matching falls back to the brute-force
 * 6D path — cheap at subset sizes.
 *
 * Chromatic samples and the RGBA atlas are carried too, which is what makes a
 * palette narrowable at runtime: chromatic-v1 searches every glyph it is given,
 * so removing glyphs is the only way to stop it reaching for them.
 *
 * A string is segmented by greedy longest match against the profile's own
 * glyph strings, so multi-code-point glyphs — VS16 emoji, ZWJ sequences —
 * select correctly. The profile defines what a character is, not Unicode
 * tables, which keeps the segmentation identical on every engine. Pass an
 * array to select exact strings. Duplicate glyphs are an error, and so is any
 * part of the input the profile has no glyph for.
 */
export declare function subsetProfile(profile: AsciiProfile, characters: string | readonly string[]): AsciiProfile;