Revise require imports (#3071)

- order (external first)
- remove superfluous file extensions
- new line after imports
- deconstruct (only one time (in `check_config.js`))
- fix path (only one time (in `global-setup.js`))

js/check_config.js

@@ -5,11 +5,11 @@
  * By Rodrigo Ramírez Norambuena https://rodrigoramirez.com
  * MIT Licensed.
  */
-const Linter = require("eslint").Linter;
-const linter = new Linter();
-
 const path = require("path");
 const fs = require("fs");
+const { Linter } = require("eslint");
+
+const linter = new Linter();
 
 const rootPath = path.resolve(`${__dirname}/../`);
 const Log = require(`${rootPath}/js/logger.js`);