Minify: Replace `async.forEach()` with `Promise.all()`

src/node/utils/Minify.js

@@ -23,7 +23,6 @@
 
 const ERR = require('async-stacktrace');
 const settings = require('./Settings');
-const async = require('async');
 const fs = require('fs');
 const path = require('path');
 const plugins = require('../../static/js/pluginfw/plugin_defs');
@@ -32,6 +31,7 @@ const urlutil = require('url');
 const mime = require('mime-types');
 const Threads = require('threads');
 const log4js = require('log4js');
+const util = require('util');
 
 const logger = log4js.getLogger('Minify');
 
@@ -213,13 +213,13 @@ const getAceFile = (callback) => {
 
     // Request the contents of the included file on the server-side and write
     // them into the file.
-    async.forEach(filenames, (filename, callback) => {
+    Promise.all(filenames.map(async (filename) => {
       // Hostname "invalid.invalid" is a dummy value to allow parsing as a URI.
       const baseURI = 'http://invalid.invalid';
       let resourceURI = baseURI + path.normalize(path.join('/static/', filename));
       resourceURI = resourceURI.replace(/\\/g, '/'); // Windows (safe generally?)
 
-      requestURI(resourceURI, 'GET', {}).then(([status, headers, body]) => {
+      const [status, , body] = await requestURI(resourceURI, 'GET', {});
       const error = !(status === 200 || status === 404);
       if (!error) {
         data += `Ace2Editor.EMBEDED[${JSON.stringify(filename)}] = ${
@@ -227,11 +227,7 @@ const getAceFile = (callback) => {
       } else {
         console.error(`getAceFile(): error getting ${resourceURI}. Status code: ${status}`);
       }
-        callback();
+    })).then(() => callback(null, data), (err) => callback(err || new Error(err)));
-      });
-    }, (error) => {
-      callback(error, data);
-    });
   });
 };
 
@@ -279,19 +275,17 @@ const lastModifiedDateOfEverything = (callback) => {
   const folders2check = [`${ROOT_DIR}js/`, `${ROOT_DIR}css/`];
   let latestModification = 0;
   // go through this two folders
-  async.forEach(folders2check, (path, callback) => {
+  Promise.all(folders2check.map(async (path) => {
     // read the files in the folder
-    fs.readdir(path, (err, files) => {
+    const files = await util.promisify(fs.readdir)(path);
-      if (ERR(err, callback)) return;
 
     // we wanna check the directory itself for changes too
     files.push('.');
 
     // go through all files in this folder
-      async.forEach(files, (filename, callback) => {
+    await Promise.all(files.map(async (filename) => {
       // get the stat data of this file
-        fs.stat(`${path}/${filename}`, (err, stats) => {
+      const stats = await util.promisify(fs.stat)(`${path}/${filename}`);
-          if (ERR(err, callback)) return;
 
       // get the modification time
       const modificationTime = stats.mtime.getTime();
@@ -300,14 +294,8 @@ const lastModifiedDateOfEverything = (callback) => {
       if (modificationTime > latestModification) {
         latestModification = modificationTime;
       }
-
+    }));
-          callback();
+  })).then(() => callback(null, latestModification), (err) => callback(err || new Error(err)));
-        });
-      }, callback);
-    });
-  }, () => {
-    callback(null, latestModification);
-  });
 };
 
 // This should be provided by the module, but until then, just use startup