import { type RemarkPunctilioOptions } from "./remark.js";
/**
 * Options for `transformMarkdown`. Inherits the Markdown-sink default of
 * `nbsp: false` from {@link RemarkPunctilioOptions}; pass `nbsp: true` to
 * opt in to non-breaking space insertion.
 */
export interface MarkdownOptions extends RemarkPunctilioOptions {
    /**
     * Character for emphasis (`*text*` vs `_text_`) and strong (`**text**` vs `__text__`).
     * Default: "*"
     */
    emphasisMarker?: "*" | "_";
    /**
     * Character for strong emphasis (`**text**` vs `__text__`). Must match emphasisMarker.
     * Default: "*"
     */
    strongMarker?: "*" | "_";
    /** Bullet marker for output consistency. Default: "-" */
    bulletMarker?: "-" | "*" | "+";
    /** Thematic break marker. Default: "-" */
    ruleMarker?: "-" | "*" | "_";
}
/** Option keys handled by `transformMarkdown` itself rather than `transform()`. */
export declare const MARKDOWN_ONLY_OPTION_KEYS: readonly string[];
/** Runtime list of valid `transformMarkdown` option keys. */
export declare const MARKDOWN_OPTION_KEYS: readonly string[];
/** @internal */
export declare function clearProcessorCache(): void;
export declare function transformMarkdown(input: string, options?: MarkdownOptions): Promise<string>;
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