import { type CjkLineBreakLevel } from './cjkClasses.js';
/** Whether the text holds any CJK character. */
export declare function hasCJK(text: string): boolean;
/** Whether the text holds words set without spaces between them (see
 *  {@link CJK_RUN_RE}): such a paragraph breaks between characters. */
export declare function hasCJKRun(text: string): boolean;
/** Whether a line may break where two runs meet with no space between them
 *  (`**日本**語`), in a paragraph set word by word: next to a CJK character
 *  only — the marks Latin text shares with Chinese (— … “ ”) count as
 *  Latin here — under the prohibitions of `level` (the document's
 *  `cjk.lineBreak` by default), so no line starts with closing punctuation
 *  (。、」…) and none ends with an opening bracket (「（…). A Japanese level
 *  reads the JLReq classes from the two graphemes (`**ちょ**っと` keeps っ
 *  off the line start at `ja-very-strict`) and keeps ‥‥ and 〳〵 whole. */
export declare function cjkJoinBreaks(left: string, right: string, level?: CjkLineBreakLevel): boolean;
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