/** One line of the `.mmd` text; `number` is 1-based, `text` has no line terminator. */
export interface SourceLine {
    readonly number: number;
    readonly text: string;
}
/** Splits on `\n`, `\r\n` or `\r`; a trailing terminator yields a final empty line (harmless: blank lines are skipped). */
export declare function splitLines(text: string): SourceLine[];
/** `%%` at the start of the line (after indentation). Mermaid ignores such lines everywhere, note blocks included. */
export declare function isCommentLine(text: string): boolean;
/** `%% @kind ...` — a directive of ours. */
export declare function isDirectiveLine(text: string): boolean;
/** `%%{ ... }%%` — a mermaid init directive, rejected by the converter. */
export declare function isInitDirectiveLine(text: string): boolean;