/**
 * Markdown content source implementation.
 *
 * Processes local markdown/MDX files with support for:
 * - Docusaurus-style versioned docs
 * - Frontmatter extraction
 * - MDX preprocessing
 * - Heading-based chunking
 */
import { BaseContentSource } from '../base.js';
import type { SourceContext, SourceResult } from '../types.js';
import { MarkdownSourceConfig } from './config.js';
/**
 * Markdown content source.
 *
 * Indexes local markdown/MDX files with support for versioning.
 */
export declare class MarkdownSource extends BaseContentSource<MarkdownSourceConfig> {
    readonly type = "markdown";
    readonly name = "Markdown (Local Files)";
    /**
     * Process the markdown source and return chunks.
     */
    process(config: MarkdownSourceConfig, context: SourceContext): Promise<SourceResult>;
    /**
     * Validate and transform raw configuration.
     */
    validateConfig(config: unknown): MarkdownSourceConfig;
    /**
     * Process a single version of the content.
     */
    private processVersion;
    /**
     * Chunk a markdown file into indexable pieces.
     */
    private chunkFile;
}
export type { MarkdownSourceConfig, MarkdownPreprocessingConfig, VersioningConfig, } from './config.js';
export { MarkdownSourceConfigSchema, MARKDOWN_SOURCE_DEFAULTS } from './config.js';
export { findMarkdownFiles, validatePath, getRelativePath } from './discovery.js';
export { readFile, fileExists, readJsonFile } from './reader.js';
export { discoverVersions, readVersionsFile, isCurrentVersion, getGuideFromVersionedPath, type VersionInfo, } from './versioning.js';
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