Switch to Terser (#2289)

1. It's actually supported
2. It's less buggy

https://twitter.com/dan_abramov/status/1060216917493981184

bundler/minify.js

@@ -1,12 +1,12 @@
 "use strict"
 
 var fs = require("fs")
-var UglifyES = require("uglify-es")
+var Terser = require("terser")
 
 module.exports = function(filePath, options) {
 	function minify(filePath) {
 		var original = fs.readFileSync(filePath, "utf8"),
-			uglified = UglifyES.minify(original),
+			uglified = Terser.minify(original),
 			compressed = uglified.code
 
 		if (uglified.error) throw new Error(uglified.error)

package-lock.json

@@ -166,6 +166,12 @@
         "concat-map": "0.0.1"
       }
     },
+    "buffer-from": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
+      "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==",
+      "dev": true
+    },
     "caller-path": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/caller-path/-/caller-path-0.1.0.tgz",
@@ -1815,6 +1821,24 @@
         "amdefine": ">=0.0.4"
       }
     },
+    "source-map-support": {
+      "version": "0.5.9",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.9.tgz",
+      "integrity": "sha512-gR6Rw4MvUlYy83vP0vxoVNzM6t8MUXqNuRsuBmBHQDu1Fh6X015FrLdgoDKcNdkwGubozq0P4N0Q37UyFVr1EA==",
+      "dev": true,
+      "requires": {
+        "buffer-from": "^1.0.0",
+        "source-map": "^0.6.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
+      }
+    },
     "sprintf-js": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
@@ -1939,6 +1963,31 @@
         }
       }
     },
+    "terser": {
+      "version": "3.10.11",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-3.10.11.tgz",
+      "integrity": "sha512-iruZ7j14oBbRYJC5cP0/vTU7YOWjN+J1ZskEGoF78tFzXdkK2hbCL/3TRZN8XB+MuvFhvOHMp7WkOCBO4VEL5g==",
+      "dev": true,
+      "requires": {
+        "commander": "~2.17.1",
+        "source-map": "~0.6.1",
+        "source-map-support": "~0.5.6"
+      },
+      "dependencies": {
+        "commander": {
+          "version": "2.17.1",
+          "resolved": "https://registry.npmjs.org/commander/-/commander-2.17.1.tgz",
+          "integrity": "sha512-wPMUt6FnH2yzG95SA6mzjQOEKUU3aLaDEmzs1ti+1E9h+CsrZghRlqEM/EJ4KscsQVG8uNN4uVreUeT8+drlgg==",
+          "dev": true
+        },
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
+      }
+    },
     "text-table": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
@@ -1972,30 +2021,6 @@
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c=",
       "dev": true
     },
-    "uglify-es": {
-      "version": "3.3.9",
-      "resolved": "https://registry.npmjs.org/uglify-es/-/uglify-es-3.3.9.tgz",
-      "integrity": "sha512-r+MU0rfv4L/0eeW3xZrd16t4NZfK8Ld4SWVglYBb7ez5uXFWHuVRs6xCTrf1yirs9a4j4Y27nn7SRfO6v67XsQ==",
-      "dev": true,
-      "requires": {
-        "commander": "~2.13.0",
-        "source-map": "~0.6.1"
-      },
-      "dependencies": {
-        "commander": {
-          "version": "2.13.0",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.13.0.tgz",
-          "integrity": "sha512-MVuS359B+YzaWqjCL/c+22gfryv+mCBPHAv3zyVI2GN8EY6IRP8VwtasXn8jyyhvvq84R4ImN1OKRtcbIasjYA==",
-          "dev": true
-        },
-        "source-map": {
-          "version": "0.6.1",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
-          "dev": true
-        }
-      }
-    },
     "uglify-js": {
       "version": "2.8.29",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.8.29.tgz",

package.json

@@ -37,7 +37,7 @@
     "locater": "^1.3.0",
     "marked": "^0.3.19",
     "pinpoint": "^1.1.0",
-    "uglify-es": "^3.3.9"
+    "terser": "^3.10.11"
   },
   "bin": {
     "ospec": "./ospec/bin/ospec"