cosmetic

Author: ibc

jest.config.mjs

@@ -2,11 +2,15 @@ const config = {
 	verbose: true,
 	testEnvironment: 'node',
 	testRegex: 'src/test/.*.test.mts',
+	// Make Jest consider .mts files as if they were ES modules.
 	moduleFileExtensions: ['mts', 'mjs', 'js', 'ts'],
 	transform: {
 		'^.+\\.mts?$': [
 			'babel-jest',
 			{
+				// We need special Babel settings for Jest plust we need it to be in
+				// a CJS configuration file, otherwise old versions of Node will fail
+				// to run Jest.
 				configFile: './babel.config-jest.cjs',
 			},
 		],