/**
 * Block-level parser: source → `BlockNode[]`.
 *
 * Line-oriented with a small open-container model. The key streaming-safety
 * rule lives here: a blank line only separates blocks at the top level and
 * *outside* an open fenced code block — a blank line inside ``` does not close
 * it. An unterminated fence parses as a `codeBlock` with `closed: false` and is
 * still rendered, so streaming code dumps don't flicker when the closing fence
 * finally arrives.
 *
 * Keys are assigned by the caller through a `KeyGen` so nested blocks (list
 * items, blockquote contents) get stable, unique keys for reconciliation.
 */
import type { BlockNode } from '../ast.js';
import type { ParserInlineExtension } from './extensions.js';
/** Monotonic key generator so every block (incl. nested) gets a unique key. */
export interface KeyGen {
    next(): string;
}
export declare function makeKeyGen(prefix: string): KeyGen;
/** Parse a complete (or partial) source string into block nodes. */
export declare function parseBlocks(src: string, keys?: KeyGen, extensions?: readonly ParserInlineExtension[]): BlockNode[];