import type { ParseOptions } from './lrc';
export declare const SQUARE_TAGS_REGEXP: RegExp;
export declare const INFO_REGEXP: RegExp;
export declare const TIME_REGEXP: RegExp;
export declare const ENHANCED_TAG_WORD_REGEXP: RegExp;
export declare enum LineType {
    INVALID = "INVALID",
    INFO = "INFO",
    TIME = "TIME"
}
export interface InvalidLine {
    type: LineType.INVALID;
}
interface TimeWordTimestamp {
    timestamp: number;
    content: string;
}
export interface TimeLine {
    type: LineType.TIME;
    timestamps: number[];
    wordTimestamps?: TimeWordTimestamp[];
    rawContent: string;
    content: string;
}
export interface InfoLine {
    type: LineType.INFO;
    key: string;
    value: string;
}
export declare function parseSquareTags(line: string): null | {
    tags: string[];
    rawContent: string;
};
export declare function parseEnhancedWords(timestamps: number[], rawContent: string): TimeLine | null;
export declare function parseTime(tags: string[], rawContent: string, { enhanced }?: ParseOptions): TimeLine;
export declare function parseInfo(tag: string): InfoLine | null;
/**
 * line parse lrc of timestamp
 * @example
 * const lp = parseLine('[ti: Song title]')
 * lp.type === LineParser.TYPE.INFO
 * lp.key === 'ti'
 * lp.value === 'Song title'
 *
 * const lp = parseLine('[10:10.10]hello')
 * lp.type === LineParser.TYPE.TIME
 * lp.timestamps === [10*60+10.10]
 * lp.content === 'hello'
 *
 * const lp = parseLine('[10:10.10] <10:10.12> hello <10:11.02> world')
 * lp.type === LineParser.TYPE.TIME
 * lp.timestamps === [10*60+10.10]
 * lp.content === 'hello world'
 * lp.wordTimestamps === [
 *  { timestamp: 10*60+10.12, content: 'hello' },
 *  { timestamp: 10*60+11.02, content: 'world' }
 * ]
 */
export declare function parseLine(line: string, options?: ParseOptions): InfoLine | TimeLine | InvalidLine;
export {};