/**
 * Schema Loader - Load Excel import schemas from various sources
 *
 * Supports loading schemas from:
 * - .f5/schemas/ directory (project-level)
 * - Built-in schemas (bundled with CLI)
 * - URL (remote schemas)
 */
import { ExcelImportSchema } from '../../types/excel-schema.js';
/**
 * Built-in schema for Japanese issue tracking Excel files (問題管理表)
 */
export declare const BUILTIN_JAPANESE_ISSUES_SCHEMA: ExcelImportSchema;
/**
 * Built-in schema for Vietnamese issue tracking
 */
export declare const BUILTIN_VIETNAMESE_ISSUES_SCHEMA: ExcelImportSchema;
/**
 * Built-in schema for standard English issue tracking
 */
export declare const BUILTIN_ENGLISH_ISSUES_SCHEMA: ExcelImportSchema;
export declare class SchemaLoader {
    private projectSchemaDir;
    private cache;
    constructor(projectRoot?: string);
    /**
     * Load a schema by name from various sources
     *
     * Resolution order:
     * 1. Cache (if already loaded)
     * 2. Project schemas (.f5/schemas/)
     * 3. Built-in schemas
     * 4. URL (if name starts with http)
     */
    load(name: string): Promise<ExcelImportSchema | null>;
    /**
     * Load schema from project .f5/schemas directory
     */
    loadFromProject(name: string): Promise<ExcelImportSchema | null>;
    /**
     * Load schema from a file path
     */
    loadFromFile(filePath: string): Promise<ExcelImportSchema | null>;
    /**
     * Load schema from URL
     */
    loadFromUrl(url: string): Promise<ExcelImportSchema | null>;
    /**
     * Load built-in schema by name
     */
    loadBuiltin(name: string): ExcelImportSchema | null;
    /**
     * Get all available schemas (built-in + project)
     */
    getAvailableSchemas(): Promise<Array<{
        name: string;
        description: string;
        source: 'builtin' | 'project';
    }>>;
    /**
     * Save a schema to the project
     */
    saveToProject(schema: ExcelImportSchema): Promise<string>;
    /**
     * Delete a project schema
     */
    deleteFromProject(name: string): Promise<boolean>;
    /**
     * Clear the schema cache
     */
    clearCache(): void;
    /**
     * Validate schema structure
     */
    private validateSchema;
    /**
     * Auto-detect best schema for an Excel file
     */
    detectBestSchema(sheetNames: string[], headers: string[]): Promise<string | null>;
}
export declare function getSchemaLoader(projectRoot?: string): SchemaLoader;