/** Where an inline run is being rendered; controls which characters can be syntax there. */
export type InlineContext = 'block' | 'heading' | 'tableCell';
/** Fine-grained escaping context beyond InlineContext. */
export interface EscapeOpts {
    /** The run begins at the start of an output line. */
    atLineStart: boolean;
    /** The run is wrapped in emphasis delimiters. */
    styled: boolean;
    /** The character following the run is unknown or active markup. */
    trailingActive: boolean;
    /** Inside a link label / image alt. */
    inLabel: boolean;
}
export declare const DEFAULT_ESCAPE_OPTS: EscapeOpts;
export declare function escapeOpts(partial?: Partial<EscapeOpts>): EscapeOpts;
/** Escape Markdown syntax in document text. */
export declare function escapeText(text: string, ctx: InlineContext, opts: EscapeOpts): string;
/** Format a link destination, angle-bracketing when needed. */
export declare function formatUrl(url: string): string;
export declare function escapeUrlAsText(url: string, ctx: InlineContext): string;
/** Shortest backtick fence longer than any backtick run in `text`. */
export declare function backtickFence(text: string, min: number): string;
/**
 * Escape a source-derived composite marker label for literal use: control
 * characters collapse to spaces and Markdown syntax is neutralized so a
 * crafted label cannot alter document structure.
 */
export declare function escapeMarkerLabel(label: string, ctx: InlineContext): string;