/**
 * Arabic letters are never slanted (#376). Arabic type has no italics: a
 * face that lacks them is slanted by the browser when an italic is asked
 * for, and a slanted Naskh is a distortion, not an emphasis. So the words
 * in Arabic script of an italic run are set upright, in the run's other
 * face; Latin words in the same run keep their italics. In a document in
 * Arabic script `*…*` is set in bold by default (`bodyText.emphasis`),
 * whose faces are upright already; this covers what is still italic: an
 * explicit `emphasis: 'italic'`, an Arabic word quoted in italics in a
 * Latin text, a reference label set italic.
 *
 * A style whose base face is italic (an italic blockquote, a heading
 * level set italic) slants its plain runs too. Their Arabic words are
 * marked `upright` instead: the measurer sets them in the run's face with
 * the slant taken off ({@link uprightFace}) and gives their segments that
 * face (`fontString`), which every renderer paints.
 *
 * Applied to the spans of every text the rich measurer sets, before it
 * measures them, so lines and segments carry the upright flag and every
 * renderer paints what was measured. Spans holding no Arabic in a slanted
 * face pass through (the same array).
 */
import type { InlineSpan } from './parse/index.js';
/** `font` (a CSS font shorthand, style first as `buildFontString` writes
 *  it) with its slant taken off: `italic 400 16px Amiri` → `400 16px
 *  Amiri`. */
export declare function uprightFace(font: string): string;
/**
 * The spans with the Arabic words of their slanted runs set upright (see
 * the module comment). `italicFont` / `boldItalicFont` are the faces an
 * italic run is measured in, `normalFont` / `boldFont` the faces of a plain
 * one (absent: taken as upright). An italic run whose plain face is
 * upright turns its Arabic words plain (`italic: false`); a run whose
 * plain face is slanted too (a style whose base face is italic) marks them
 * `upright`. A run whose face is upright (the faces of `emphasis: 'bold'`
 * or `'color'`, the flipped face of an italic blockquote) is left as it is.
 */
export declare function uprightArabicSpans(spans: InlineSpan[], italicFont: string, boldItalicFont: string, normalFont?: string, boldFont?: string): InlineSpan[];
//# sourceMappingURL=uprightArabic.d.ts.map