converted a function to a generator; simpler, more efficient, cooler.

after.js

// recursively get all files in a folder
function* getAllFiles(dirPath: string): Iterable<string> {
  for (const file of fs.readdirSync(dirPath)) {
    const pathToCheck = path.join(dirPath, file);
    if (fs.statSync(pathToCheck).isDirectory()) {
      if (file !== 'node_modules') {
        yield* getAllFiles(pathToCheck);
      }
    } else {
      yield pathToCheck;
    }
  }
}

before.js

// recursively get all files in a folder
function getAllFiles(dirPath: string, arrayOfFiles: string[] = []) {
  const files = fs.readdirSync(dirPath);

  files.forEach(function (file) {
    const pathToCheck = path.join(dirPath, file);
    if (fs.statSync(pathToCheck).isDirectory()) {
      if (file !== 'node_modules') {
        arrayOfFiles = getAllFiles(pathToCheck, arrayOfFiles);
      }
    } else {
      arrayOfFiles.push(pathToCheck);
    }
  });

  return arrayOfFiles;
}

function-to-generator.diff

 
// recursively get all files in a folder
-function getAllFiles(dirPath: string, arrayOfFiles: string[] = []) {
-  const files = fs.readdirSync(dirPath);
-
-  files.forEach(function (file) {
+function* getAllFiles(dirPath: string): Iterable<string> {
+  for (const file of fs.readdirSync(dirPath)) {
     const pathToCheck = path.join(dirPath, file);
     if (fs.statSync(pathToCheck).isDirectory()) {
       if (file !== 'node_modules') {
-        arrayOfFiles = getAllFiles(pathToCheck, arrayOfFiles);
+        yield* getAllFiles(pathToCheck);
       }
     } else {
-      arrayOfFiles.push(pathToCheck);
+      yield pathToCheck;
     }
-  });
-
-  return arrayOfFiles;
+  }
 }