What kind of file is .babelrc?

Question

In the context of this exercise, what kind of file is .babelrc?

Answer

.babelrc is a configuration file for Babel. A configuration file is one that usually stores plain text that can be edited with any common text editor, and contains data used for configuration parameters and initial settings of a program.

One misconception is that .babelrc is a file extension, but is actual the entire name of the file.