export interface WatchFileUpdates {
    initial: boolean;
    updated: string[];
    deleted: string[];
}
/**
 * Join a base path with a pattern.
 */
export declare function joinPattern(base: string, pattern: string): string;
export interface WatchFileOptions {
    cwd: string;
    patterns: string[];
    handleUpdates: (updates: WatchFileUpdates) => Promise<void>;
    delay?: number;
}
/**
 * Watch for file system changes.
 *
 * This uses chokidar underneath.
 */
export declare function watchFiles(options: WatchFileOptions): void;
/**
 * Find files matching the given patterns.
 *
 * This uses picomatch for matching which is also used internally by chokidar.
 *
 * @returns An array with absolute filenames.
 */
export declare function findFiles(cwd: string, patterns: string[]): Promise<string[]>;
/**
 * Deduplicate files that exist in multiple "node_modules" directories.
 */
export declare function deduplicateModuleFilenames(filenames: string[]): string[];