/**
 * classify files by extname
 * unAvailableFilePath will be used for warning.
 * If The user can use glob pattern like `src/*.js` as arguments, It will be expanded by shell.
 * pathsToGlobPatterns not modified that pattern.
 * So, unAvailableFilePath should be ignored silently.
 * @param {string[]} files
 * @param {{extensions?: string[]}} [options]
 * @returns {{availableFiles: string[], unAvailableFiles: string[]}}
 */
export declare function separateByAvailability(files: string[], options?: {
    extensions?: string[];
}): {
    availableFiles: string[];
    unAvailableFiles: string[];
};
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