/**
 * Line ends inside a paragraph between East Asian characters (#181).
 *
 * The lines of a paragraph or a blockquote are joined with a space, and a
 * resource snippet (a caption, a note, a table cell) keeps its line ends as
 * whitespace. Chinese and Japanese are written without spaces, so a line end
 * between two ideographs must vanish instead: CSS Text 3 §4.1.3 ("segment
 * break transformation") removes a segment break when the characters on both
 * sides are East Asian Wide, Fullwidth or Halfwidth and neither is Hangul,
 * and when either side is a zero-width space. Its second rule, for Chinese
 * and Japanese text, also lets either side be an ambiguous-width punctuation
 * mark or symbol (`“`, `”`, `…`, `—`); the parser does not know the
 * document's language, so a run of such marks is looked through to the
 * characters around it (see {@link removesLineEndAt}). Korean keeps its
 * spaces.
 */
import type { InlineSpan } from './types.js';
/** A character of the East Asian scripts whose East Asian Width is Wide,
 *  Fullwidth or Halfwidth (UAX #11), Hangul left out: ideographs and their
 *  radicals and strokes, kana, bopomofo, Yi, CJK punctuation and symbols,
 *  the fullwidth and halfwidth forms, the vertical and small form variants.
 *  Emoji (also Wide) are left out: a line end between two of them in Latin
 *  prose keeps its space. */
export declare function isEastAsianWide(cp: number): boolean;
/** Whether a line end between the code points `before` and `after` is
 *  removed rather than set as a space (CSS Text 3 §4.1.3). */
export declare function removesSegmentBreak(before: number | undefined, after: number | undefined): boolean;
/**
 * Whether a line end between `text[…before)` and `text[after…]` is removed.
 * Beside the rules of {@link removesSegmentBreak}, a line end between two
 * ambiguous marks (`”⏎“`, `……⏎“`, `”⏎——`) goes when the nearest character
 * past the marks on either side is East Asian wide and neither is Hangul:
 * `“你好”⏎“再见”` joins, `“hello”⏎“bye”` and `“안녕”⏎“잘 가”` keep their space.
 * `skip` (a placeholder such as a footnote marker's) is looked through too.
 */
export declare function removesLineEndAt(text: string, before: number, after: number, skip?: string): boolean;
/**
 * Take out of a paragraph's or blockquote's mapped text the spaces that
 * joined two source lines between East Asian characters. A joining space is
 * one whose source, up to the next character's, holds the line end.
 * Returns `undefined` when nothing changes, so a block without Chinese text
 * keeps its arrays as they are.
 */
export declare function joinEastAsianLines(markdown: string, text: string, spans: InlineSpan[], sourceMap: number[]): {
    text: string;
    spans: InlineSpan[];
    sourceMap: number[];
} | undefined;
/**
 * Take out of a resource snippet's spans (a caption, a note, a table cell)
 * the line ends that fall between East Asian characters, with the spaces
 * and tabs around them. The snippet's own text is the source, so the map
 * built afterwards (`computeSourceMap`) skips them.
 */
export declare function joinEastAsianSnippetLines(spans: InlineSpan[]): InlineSpan[];
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