/** An inclusive codepoint range, as written in a `unicode-range`. */
export interface CodepointRange {
  readonly first: number;
  readonly last: number;
}
/** One `@font-face` a built deck carries, without its payload. */
export interface FontFaceInfo {
  /** Family name the block declares. */
  family: string;
  /** fontsource subset slug (`latin`, `cyrillic-ext`, …). */
  subset: string;
  /** Absolute path of the woff2 the block inlines. */
  file: string;
  /**
   * The range the block declares. The browser consults the face for these
   * codepoints and no others, so a face's real coverage is its cmap
   * intersected with this.
   */
  ranges: readonly CodepointRange[];
}
/**
 * Parse a `unicode-range` value: comma-separated `U+XXXX`, `U+XXXX-YYYY` and
 * wildcard `U+XX??` forms. An unparseable token is dropped rather than guessed
 * at — a range that claims too little only costs a subset that was going to be
 * included anyway.
 */
export declare function parseUnicodeRange(value: string): CodepointRange[];
/** Whether a codepoint falls inside any of the ranges. */
export declare function rangesContain(
  ranges: readonly CodepointRange[],
  codepoint: number,
): boolean;
/** The two stylesheets a deck's fonts contribute. */
export interface FontCss {
  /** `@font-face` blocks with woff2 data URLs — self-contained, offline. */
  faces: string;
  /** `:root` family tokens, empty unless the deck configured its own. */
  tokens: string;
}
/**
 * Build a deck's font CSS: the subsets its text needs, in the families it
 * asked for.
 *
 * The result is a function of the deck, so it is not cached as a whole; the
 * file reads and base64 behind it are. `zerp serve` rebuilds the document per
 * request and therefore re-selects per request, which is what keeps live
 * reload honest when a slide gains a character in a new script. (A change to
 * package.json needs a server restart — serve watches slides/.)
 */
export declare function fontCss(rootDir: string, codepoints: ReadonlySet<number>): Promise<FontCss>;