code: function copyFiles(sourceDir, files, options = {}) {
  	const { overwrite = true, errorOnExist } = options;
  
  	_.castArray(files).forEach(file => {
  		const sourcePath = path.resolve(sourceDir, file);
  		if (!fs.existsSync(sourcePath)) {
  			throw new MrmError(`copyFiles: source file not found: ${sourcePath}`);
  		}
  
  		const targetExist = fs.existsSync(file);
  		if (targetExist && !overwrite) {
  			if (errorOnExist) {
  				throw new MrmError(`copyFiles: target file already exists: ${file}`);
  			}
  			return;
  		}
  
  		const content = read(sourcePath);
  
  		// Skip copy if file contents are the same
  		if (content === read(file)) {
  			return;
  		}
  
  		updateFile(file, content, targetExist);
  	});
  }
docs: Copy files from a given directory to the current working directory