switch from uglify to terser (#567)

package-lock.json

@@ -5038,6 +5038,11 @@
       "resolved": "https://registry.npmjs.org/fg-loadcss/-/fg-loadcss-2.0.1.tgz",
       "integrity": "sha512-gFtSJjMMt9it0OhXz4wJQT46/LFUrJ2Db6U/fLtwClBEMEEjmVPSWSYrbGCyFwy47Cd4ULOpR+HSWXVkUKciaQ=="
     },
+    "figgy-pudding": {
+      "version": "3.5.1",
+      "resolved": "https://registry.npmjs.org/figgy-pudding/-/figgy-pudding-3.5.1.tgz",
+      "integrity": "sha512-vNKxJHTEKNThjfrdJwHc7brvM6eVevuO5nTj6ez8ZQ1qbXTvGthucRF7S4vf2cr71QVnT70V34v0S1DyQsti0w=="
+    },
     "figures": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/figures/-/figures-2.0.0.tgz",
@@ -9933,7 +9938,6 @@
       "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"
@@ -9942,8 +9946,7 @@
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
-          "dev": true
         }
       }
     },
@@ -10600,6 +10603,185 @@
         "xtend": "^4.0.0"
       }
     },
+    "terser": {
+      "version": "3.8.2",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-3.8.2.tgz",
+      "integrity": "sha512-FGSBXiBJe2TSXy6pWwXpY0YcEWEK35UKL64BBbxX3aHqM4Nj0RMqXvqBuoSGfyd80t8MKQ5JwYm5jRRGTSEFNg==",
+      "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=="
+        },
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
+        }
+      }
+    },
+    "terser-webpack-plugin": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/terser-webpack-plugin/-/terser-webpack-plugin-1.1.0.tgz",
+      "integrity": "sha512-61lV0DSxMAZ8AyZG7/A4a3UPlrbOBo8NIQ4tJzLPAdGOQ+yoNC7l5ijEow27lBAL2humer01KLS6bGIMYQxKoA==",
+      "requires": {
+        "cacache": "^11.0.2",
+        "find-cache-dir": "^2.0.0",
+        "schema-utils": "^1.0.0",
+        "serialize-javascript": "^1.4.0",
+        "source-map": "^0.6.1",
+        "terser": "^3.8.1",
+        "webpack-sources": "^1.1.0",
+        "worker-farm": "^1.5.2"
+      },
+      "dependencies": {
+        "cacache": {
+          "version": "11.2.0",
+          "resolved": "https://registry.npmjs.org/cacache/-/cacache-11.2.0.tgz",
+          "integrity": "sha512-IFWl6lfK6wSeYCHUXh+N1lY72UDrpyrYQJNIVQf48paDuWbv5RbAtJYf/4gUQFObTCHZwdZ5sI8Iw7nqwP6nlQ==",
+          "requires": {
+            "bluebird": "^3.5.1",
+            "chownr": "^1.0.1",
+            "figgy-pudding": "^3.1.0",
+            "glob": "^7.1.2",
+            "graceful-fs": "^4.1.11",
+            "lru-cache": "^4.1.3",
+            "mississippi": "^3.0.0",
+            "mkdirp": "^0.5.1",
+            "move-concurrently": "^1.0.1",
+            "promise-inflight": "^1.0.1",
+            "rimraf": "^2.6.2",
+            "ssri": "^6.0.0",
+            "unique-filename": "^1.1.0",
+            "y18n": "^4.0.0"
+          }
+        },
+        "find-cache-dir": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/find-cache-dir/-/find-cache-dir-2.0.0.tgz",
+          "integrity": "sha512-LDUY6V1Xs5eFskUVYtIwatojt6+9xC9Chnlk/jYOOvn3FAFfSaWddxahDGyNHh0b2dMXa6YW2m0tk8TdVaXHlA==",
+          "requires": {
+            "commondir": "^1.0.1",
+            "make-dir": "^1.0.0",
+            "pkg-dir": "^3.0.0"
+          }
+        },
+        "find-up": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/find-up/-/find-up-3.0.0.tgz",
+          "integrity": "sha512-1yD6RmLI1XBfxugvORwlck6f75tYL+iR0jqwsOrOxMZyGYqUuDhJ0l4AXdO1iX/FTs9cBAMEk1gWSEx1kSbylg==",
+          "requires": {
+            "locate-path": "^3.0.0"
+          }
+        },
+        "locate-path": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-3.0.0.tgz",
+          "integrity": "sha512-7AO748wWnIhNqAuaty2ZWHkQHRSNfPVIsPIfwEOWO22AmaoVrWavlOcMR5nzTLNYvp36X220/maaRsrec1G65A==",
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "lru-cache": {
+          "version": "4.1.3",
+          "resolved": "https://registry.npmjs.org/lru-cache/-/lru-cache-4.1.3.tgz",
+          "integrity": "sha512-fFEhvcgzuIoJVUF8fYr5KR0YqxD238zgObTps31YdADwPPAp82a4M8TrckkWyx7ekNlf9aBcVn81cFwwXngrJA==",
+          "requires": {
+            "pseudomap": "^1.0.2",
+            "yallist": "^2.1.2"
+          }
+        },
+        "mississippi": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/mississippi/-/mississippi-3.0.0.tgz",
+          "integrity": "sha512-x471SsVjUtBRtcvd4BzKE9kFC+/2TeWgKCgw0bZcw1b9l2X3QX5vCWgF+KaZaYm87Ss//rHnWryupDrgLvmSkA==",
+          "requires": {
+            "concat-stream": "^1.5.0",
+            "duplexify": "^3.4.2",
+            "end-of-stream": "^1.1.0",
+            "flush-write-stream": "^1.0.0",
+            "from2": "^2.1.0",
+            "parallel-transform": "^1.1.0",
+            "pump": "^3.0.0",
+            "pumpify": "^1.3.3",
+            "stream-each": "^1.1.0",
+            "through2": "^2.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.0.0.tgz",
+          "integrity": "sha512-fl5s52lI5ahKCernzzIyAP0QAZbGIovtVHGwpcu1Jr/EpzLVDI2myISHwGqK7m8uQFugVWSrbxH7XnhGtvEc+A==",
+          "requires": {
+            "p-try": "^2.0.0"
+          }
+        },
+        "p-locate": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-3.0.0.tgz",
+          "integrity": "sha512-x+12w/To+4GFfgJhBEpiDcLozRJGegY+Ei7/z0tSLkMmxGZNybVMSfWj9aJn8Z5Fc7dBUNJOOVgPv2H7IwulSQ==",
+          "requires": {
+            "p-limit": "^2.0.0"
+          }
+        },
+        "p-try": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/p-try/-/p-try-2.0.0.tgz",
+          "integrity": "sha512-hMp0onDKIajHfIkdRk3P4CdCmErkYAxxDtP3Wx/4nZ3aGlau2VKh3mZpcuFkH27WQkL/3WBCPOktzA9ZOAnMQQ=="
+        },
+        "pkg-dir": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/pkg-dir/-/pkg-dir-3.0.0.tgz",
+          "integrity": "sha512-/E57AYkoeQ25qkxMj5PBOVgF8Kiu/h7cYS30Z5+R7WaiCCBfLq58ZI/dSeaEKb9WVJV5n/03QwrN3IeWIFllvw==",
+          "requires": {
+            "find-up": "^3.0.0"
+          }
+        },
+        "pump": {
+          "version": "3.0.0",
+          "resolved": "https://registry.npmjs.org/pump/-/pump-3.0.0.tgz",
+          "integrity": "sha512-LwZy+p3SFs1Pytd/jYct4wpv49HiYCqd9Rlc5ZVdk0V+8Yzv6jR5Blk3TRmPL1ft69TxP0IMZGJ+WPFU2BFhww==",
+          "requires": {
+            "end-of-stream": "^1.1.0",
+            "once": "^1.3.1"
+          }
+        },
+        "schema-utils": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-1.0.0.tgz",
+          "integrity": "sha512-i27Mic4KovM/lnGsy8whRCHhc7VicJajAjTrYg11K9zfZXnYIt4k5F+kZkwjnrhKzLic/HLU4j11mjsz2G/75g==",
+          "requires": {
+            "ajv": "^6.1.0",
+            "ajv-errors": "^1.0.0",
+            "ajv-keywords": "^3.1.0"
+          }
+        },
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
+        },
+        "ssri": {
+          "version": "6.0.1",
+          "resolved": "https://registry.npmjs.org/ssri/-/ssri-6.0.1.tgz",
+          "integrity": "sha512-3Wge10hNcT1Kur4PDFwEieXSCMCJs/7WvSACcrMYrNp+b8kDL1/0wJch5Ni2WrtwEa2IO8OsVfeKIciKCDx/QA==",
+          "requires": {
+            "figgy-pudding": "^3.5.1"
+          }
+        },
+        "y18n": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.0.tgz",
+          "integrity": "sha512-r9S/ZyXu/Xu9q1tYlpsLIsa3EeLXXk0VwlxqTcFRfg9EhMW+17kbt9G0NrgCmhGb5vT2hyhJZLfDGx+7+5Uj/w=="
+        }
+      }
+    },
     "testcafe": {
       "version": "0.22.0",
       "resolved": "https://registry.npmjs.org/testcafe/-/testcafe-0.22.0.tgz",

package.json

@@ -93,9 +93,9 @@
     "svelte-loader": "^2.11.0",
     "svelte-transitions": "^1.2.0",
     "svgo": "^1.1.1",
+    "terser-webpack-plugin": "^1.1.0",
     "timeago.js": "^3.0.2",
     "tiny-queue": "^0.2.1",
-    "uglifyjs-webpack-plugin": "^1.3.0",
     "web-animations-js": "^2.3.1",
     "webpack": "^4.17.1",
     "webpack-bundle-analyzer": "^3.0.2",

webpack.client.config.js

@@ -2,7 +2,7 @@ const webpack = require('webpack')
 const config = require('sapper/webpack/config.js')
 const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin
 const LodashModuleReplacementPlugin = require('lodash-webpack-plugin')
-const UglifyWebpackPlugin = require('uglifyjs-webpack-plugin')
+const TerserWebpackPlugin = require('terser-webpack-plugin')
 const MiniCssExtractPlugin = require('mini-css-extract-plugin')
 const OptimizeCSSAssetsPlugin = require('optimize-css-assets-webpack-plugin')
 
@@ -59,11 +59,11 @@ module.exports = {
   },
   optimization: isDev ? {} : {
     minimizer: [
-      new UglifyWebpackPlugin({
+      new TerserWebpackPlugin({
         cache: true,
         parallel: true,
         sourceMap: true,
-        uglifyOptions: {
+        terserOptions: {
           ecma: 6,
           mangle: true,
           compress: true,