import type { FolioConfig, FolioPaperFinish, FolioPaperTexture, FolioPaperType, PageSizePreset, ResolvedFolioConfig } from '../types.js';
/** A paper stock's trade defaults: weight (g/m²), bulk (cm³/g, so caliper
 *  µm = grammage × bulk), finish, surface texture and shade. */
export interface FolioPaperStock {
    grammage: number;
    bulk: number;
    finish: Exclude<FolioPaperFinish, 'auto'>;
    texture: Exclude<FolioPaperTexture, 'auto'>;
    shade: string;
}
/** Typical values for each stock, from mill data sheets: uncoated
 *  woodfree offset; bulky book wove in natural / cream (the Munken and
 *  Holmen Book kind); coated matte, silk and gloss (art) papers, thinner
 *  for their weight as the coating is calendered; bible (India) paper; and
 *  newsprint; cover card; and rigid board (about 2 mm). */
export declare const FOLIO_PAPER_STOCKS: Readonly<Record<FolioPaperType, FolioPaperStock>>;
export declare const DEFAULT_FOLIO_CONFIG: ResolvedFolioConfig;
/** The trims that are newspapers (#506). */
export declare const NEWSPAPER_SIZE_PRESETS: readonly PageSizePreset[];
export declare const isNewspaperSizePreset: (preset: PageSizePreset | undefined) => boolean;
/** The book Folio shows on a newspaper trim: sheets of newsprint folded
 *  once and laid one inside the other. */
export declare const NEWSPAPER_FOLIO_CONFIG: ResolvedFolioConfig;
/** The defaults `config.folio` falls back to on a page of this trim: a
 *  newspaper's newsprint and fold, a book's woodfree offset and hardcover
 *  otherwise. */
export declare function folioDefaultsFor(sizePreset?: PageSizePreset): ResolvedFolioConfig;
/** `config.folio` with the stock and the binding its trim implies written
 *  in where it names none: on a newspaper trim (`broadsheet`, `berliner`,
 *  `tabloid`, `compact`) `paper.type: 'newsprint'` and `binding.type:
 *  'folded'`. A stock or binding the config names is kept. Other trims
 *  return it unchanged. */
export declare function folioForTrim(folio: FolioConfig | undefined, sizePreset: PageSizePreset | undefined): FolioConfig | undefined;
/** The lowest the view may be tilted, as the viewer's orbit allows. */
export declare const FOLIO_MAX_TILT = 70;
/** An angle in degrees brought into −180 … 180 (a whole turn is no turn). */
export declare function wrapFolioYaw(deg: number): number;
/** `config.folio` with every setting filled in: a paper's unset fields
 *  follow its stock, `auto` finishes and textures too, and the cover
 *  material follows the binding. `sizePreset`, the page's trim, picks the
 *  stock and binding left unset (see {@link folioForTrim}). */
export declare function resolveFolioConfig(config?: FolioConfig, sizePreset?: PageSizePreset): ResolvedFolioConfig;
/** `config.folio` without the settings equal to their defaults (a paper's
 *  against its stock's); undefined when nothing is left. The defaults are
 *  those of the page's trim (`sizePreset`): on a newspaper a `newsprint`
 *  stock and a `folded` binding go, a woodfree or hardcover one stays. */
export declare function stripFolioDefaults(folio?: FolioConfig, sizePreset?: PageSizePreset): FolioConfig | undefined;
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