whole_func_string: function readFile(file, encoding) {
  
  	return new Promise((resolve, reject) => {
  
  		fs.readFile(file, encoding, (error, data) => error ? reject(error) : resolve(data));
  
  	});
  
  }
func_code_string: function readFile(file, encoding) {
  
  	return new Promise((resolve, reject) => {
  
  		fs.readFile(file, encoding, (error, data) => error ? reject(error) : resolve(data));
  
  	});
  
  }
func_documentation_string: Reads the given file.
  
  @private
  @param {String} file - A file path.
  @param {String} encoding - The file encoding.
  @return {Promise} A promise.