/**
 * Fenced-code tracker — THE definition of "am I inside a code fence".
 * Server-safe: no React, no DOM.
 *
 * Lives in its own module because it is a GENERAL CommonMark fence machine
 * with two unrelated consumers: the heading scanner
 * (`utils/markdown-heading-id`) and the streaming block splitter
 * (`components/ui/markdown/streaming`). It used to live inside
 * `markdown-heading-id`, which meant a streaming renderer imported its fence
 * state machine from a module named after heading slugs. `markdown-heading-id`
 * re-exports these names so the public `utils` surface is unchanged.
 */
/** True when `line` is a CommonMark blank line (spaces/tabs only, `\r`-tolerant). */
export declare function isBlankLine(line: string): boolean;
/**
 * What one source line is, relative to fenced code:
 *  - `open`  — this line opened a fence
 *  - `close` — this line closed the open fence
 *  - `inside`— this line is fence content (including a would-be delimiter that
 *              does NOT close the open fence: wrong marker char, too short, or
 *              carrying an info string)
 *  - `text`  — this line is ordinary markdown outside any fence
 *
 * NOTE: no consumer discriminates the three non-`text` roles today — both the
 * heading scanner and the streaming splitter only test `!== 'text'`, and the
 * closer-haystack mask below only tests `=== 'open'` / `=== 'close'`. The
 * four-value union is kept because the state machine already computes the
 * distinction for free and a future consumer (e.g. fence-aware syntax
 * post-processing) would otherwise have to re-derive it.
 */
export type FenceLineRole = 'open' | 'close' | 'inside' | 'text';
export interface FenceTracker {
    /** Advance across one raw source line (mutates) and classify it. */
    push(line: string): FenceLineRole;
    /** Marker CHARACTER of the currently open fence (`` ` `` / `~`), or null. */
    openChar(): string | null;
    /** Run length of the currently open fence (a closer must be ≥ this). */
    openLength(): number;
}
/** A fresh fenced-code state machine. Server-safe: no React, no DOM. */
export declare function createFenceTracker(): FenceTracker;
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