diff --git a/packages/minifier-js/minifier.js b/packages/minifier-js/minifier.js
index 87d74c1687..e024231068 100644
--- a/packages/minifier-js/minifier.js
+++ b/packages/minifier-js/minifier.js
@@ -1,17 +1,17 @@
-var terser;
+const terser = Npm.require("terser");
 
 meteorJsMinify = function (source) {
-  var result = {};
-  var NODE_ENV = process.env.NODE_ENV || "development";
-
-  terser = terser || Npm.require("terser");
+  const result = {};
+  const NODE_ENV = process.env.NODE_ENV || "development";
 
   try {
-    var terserResult = terser.minify(source, {
+    const options = {
       compress: {
-        drop_debugger: false,
-        unused: false,
-        dead_code: true,
+        passes: 1,             // default is 1 (2 or more passes could lead to better compression)
+        inline: true,          // default is true which will aggresively inline functions
+        drop_debugger: false,  // remove debugger; statements
+        unused: false,         // drop unreferenced functions and variables
+        dead_code: true,       // remove unreachable code
         global_defs: {
           "process.env.NODE_ENV": NODE_ENV
         }
@@ -19,24 +19,26 @@ meteorJsMinify = function (source) {
       // Fix issue #9866, as explained in this comment:
       // https://github.com/mishoo/UglifyJS2/issues/1753#issuecomment-324814782
       // And fix terser issue #117: https://github.com/terser-js/terser/issues/117
-      safari10: true,
-    });
+      safari10: true,          // set this option to true to work around the Safari 10/11 await bug
+    };
+
+    const terserResult = terser.minify(source, options);
 
     if (typeof terserResult.code === "string") {
       result.code = terserResult.code;
       result.minifier = 'terser';
     } else {
-      throw terserResult.error ||
-        new Error("unknown terser.minify failure");
+      throw terserResult.error || new Error("unknown terser.minify failure");
     }
 
-  } catch (e) {
+  } catch (err) {
     // Although Babel.minify can handle a wider variety of ECMAScript
-    // 2015+ syntax, it is substantially slower than UglifyJS/terser, so
+    // 2015+ syntax, it is substantially slower than terser, so
     // we use it only as a fallback.
-    var options = Babel.getMinifierOptions({
+    const options = Babel.getMinifierOptions({
       inlineNodeEnv: NODE_ENV
     });
+
     result.code = Babel.minify(source, options).code;
     result.minifier = 'babel-minify';
   }