/**
 * THE frontmatter delimiter split (round 15 follow-up, F6): where a Markdown
 * document's `---` frontmatter starts and ends, for readers that hand the block
 * to {@link parseFrontmatter}. Decision records and Cursor `.mdc` rules read
 * through it (their ad-hoc splitters disagreed: one needed `---\n` exactly and
 * missed a CRLF or a `--- ` file, the other opened on any line STARTING with
 * `---` and closed on `---x`).
 *
 *   - A UTF-8 BOM is dropped and CRLF / CR line ends become `\n` first.
 *   - The first line, trailing whitespace ignored, must be `---`; the block ends
 *     at the next line that is `---` (trailing whitespace ignored) — at column
 *     0, so an indented `---` inside a block scalar never closes it.
 *   - No closing line: no frontmatter, the whole document is the body, and
 *     `unterminated` says so.
 *
 * Pure. No IO.
 */
import type { IFrontmatterSplit } from './i-frontmatter-split.js';
export declare function splitFrontmatter(source: string): IFrontmatterSplit;
//# sourceMappingURL=split-frontmatter.d.ts.map