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'use strict';
const fs = require('fs');const uppercaseRE = /[A-Z]/g;
const checkFolder = (folder) => {  const folderContent = fs.readdirSync(folder);
  for (const entry of folderContent) {
    if (fs.lstatSync(folder + '/' + entry).isDirectory()) {      checkFolder(folder + '/' + entry);    } else {      if (entry === '.gitignore' || entry.endsWith('.d.ts')) {        if (uppercaseRE.test(entry)) {          console.error('File ' + entry + ' contains uppercase characters.\n');          process.exit(1);        }        continue;      } else {        console.error('File ' + entry + ' is not having a valid file-extension.\n');        process.exit(1);      }    }  }};
checkFolder('./types');