Minification of a dist folder preserving swagger comments

minify.js

var Terser = require("terser");
var fs = require("fs");
var path = require("path");

// This function takes a path and returns an array of the
// file paths in that directory that satisfy the requirements
function getAllFiles(dirPath, arrayOfFiles) {
  let files = fs.readdirSync(dirPath);

  arrayOfFiles = arrayOfFiles || [];

  files.forEach(function(file) {
    // Recursively go into each folder in the initial dirPath
    if (fs.statSync(dirPath + "/" + file).isDirectory()) {
      arrayOfFiles = getAllFiles(dirPath + "/" + file, arrayOfFiles);
    } else {
      // Build the array of file paths otherwise
      arrayOfFiles.push(path.join(__dirname, dirPath, "/", file));
    }
  });

  // Only return an array of files that end in .js
  return arrayOfFiles.filter((path) => path.match(/\.js$/));
}

// The code that takes the array built above and rewrites
// the files in their minified state
function minifyFiles(filePaths) {
  filePaths.forEach((filePath) => {
    fs.writeFileSync(
      filePath,
      Terser.minify(fs.readFileSync(filePath, "utf8"), {
        output: {
          // Don't strip out comment blocks that contain
          // this regex
          comments: "/@swagger/"
        },
      }).code
    );
  });
}

// Call the script with the output directory of tsc as
// the argument to build the file list
const files = getAllFiles("./dist");

// Minify all the files output for the list
minifyFiles(files);