diff --git a/package.json b/package.json
index 0aaf47802..32f5e4481 100644
--- a/package.json
+++ b/package.json
@@ -154,7 +154,7 @@
     "sass-loader": "^7.0.3",
     "stringz": "^2.0.0",
     "substring-trie": "^1.0.2",
-    "terser-webpack-plugin": "^1.3.0",
+    "terser-webpack-plugin": "^1.4.1",
     "throng": "^4.0.0",
     "tiny-queue": "^0.2.1",
     "uuid": "^3.1.0",
diff --git a/yarn.lock b/yarn.lock
index 238b0ce96..4647472b5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1965,6 +1965,11 @@ bluebird@^3.5.1, bluebird@^3.5.3:
   resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.3.tgz#7d01c6f9616c9a51ab0f8c549a79dfe6ec33efa7"
   integrity sha512-/qKPUQlaW1OyR51WeCPBvRnAlnZFUJkCSG5HzGnuIqhgyJtF+T94lFnn33eiazjRm2LAHVy2guNnaq48X9SJuw==
 
+bluebird@^3.5.5:
+  version "3.5.5"
+  resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.5.tgz#a8d0afd73251effbbd5fe384a77d73003c17a71f"
+  integrity sha512-5am6HnnfN+urzt4yfg7IgTbotDjIT/u8AJpEt0sIU9FtXfVeezXAPKswrG+xKUCOYAINpSdgZVDU6QFh+cuH3w==
+
 blurhash@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/blurhash/-/blurhash-1.0.0.tgz#9087bc5cc4d482f1305059d7410df4133adcab2e"
@@ -2187,7 +2192,7 @@ bytes@3.1.0:
   resolved "https://registry.yarnpkg.com/bytes/-/bytes-3.1.0.tgz#f6cf7933a360e0588fa9fde85651cdc7f805d1f6"
   integrity sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg==
 
-cacache@^11.2.0, cacache@^11.3.2:
+cacache@^11.2.0:
   version "11.3.2"
   resolved "https://registry.yarnpkg.com/cacache/-/cacache-11.3.2.tgz#2d81e308e3d258ca38125b676b98b2ac9ce69bfa"
   integrity sha512-E0zP4EPGDOaT2chM08Als91eYnf8Z+eH1awwwVsngUmgppfM5jjJ8l3z5vO5p5w/I3LsiXawb1sW0VY65pQABg==
@@ -2207,6 +2212,27 @@ cacache@^11.2.0, cacache@^11.3.2:
     unique-filename "^1.1.1"
     y18n "^4.0.0"
 
+cacache@^12.0.2:
+  version "12.0.2"
+  resolved "https://registry.yarnpkg.com/cacache/-/cacache-12.0.2.tgz#8db03205e36089a3df6954c66ce92541441ac46c"
+  integrity sha512-ifKgxH2CKhJEg6tNdAwziu6Q33EvuG26tYcda6PT3WKisZcYDXsnEdnRv67Po3yCzFfaSoMjGZzJyD2c3DT1dg==
+  dependencies:
+    bluebird "^3.5.5"
+    chownr "^1.1.1"
+    figgy-pudding "^3.5.1"
+    glob "^7.1.4"
+    graceful-fs "^4.1.15"
+    infer-owner "^1.0.3"
+    lru-cache "^5.1.1"
+    mississippi "^3.0.0"
+    mkdirp "^0.5.1"
+    move-concurrently "^1.0.1"
+    promise-inflight "^1.0.1"
+    rimraf "^2.6.3"
+    ssri "^6.0.1"
+    unique-filename "^1.1.1"
+    y18n "^4.0.0"
+
 cache-base@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/cache-base/-/cache-base-1.0.1.tgz#0a7f46416831c8b662ee36fe4e7c59d76f666ab2"
@@ -2530,7 +2556,7 @@ combined-stream@^1.0.6, combined-stream@~1.0.6:
   dependencies:
     delayed-stream "~1.0.0"
 
-commander@^2.11.0, commander@^2.18.0, commander@^2.19.0, commander@^2.8.1, commander@~2.20.0:
+commander@^2.11.0, commander@^2.18.0, commander@^2.19.0, commander@^2.20.0, commander@^2.8.1, commander@~2.20.0:
   version "2.20.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.0.tgz#d58bb2b5c1ee8f87b0d340027e9e94e222c5a422"
   integrity sha512-7j2y+40w61zy6YC2iRNpUe/NwhNyoXrYpHMrSunaMG64nRnaf96zO/KMQR4OyN/UnE5KLyEBnKHd4aG3rskjpQ==
@@ -4231,13 +4257,13 @@ finalhandler@~1.1.2:
     statuses "~1.5.0"
     unpipe "~1.0.0"
 
-find-cache-dir@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/find-cache-dir/-/find-cache-dir-2.0.0.tgz#4c1faed59f45184530fb9d7fa123a4d04a98472d"
-  integrity sha512-LDUY6V1Xs5eFskUVYtIwatojt6+9xC9Chnlk/jYOOvn3FAFfSaWddxahDGyNHh0b2dMXa6YW2m0tk8TdVaXHlA==
+find-cache-dir@^2.0.0, find-cache-dir@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/find-cache-dir/-/find-cache-dir-2.1.0.tgz#8d0f94cd13fe43c6c7c261a0d86115ca918c05f7"
+  integrity sha512-Tq6PixE0w/VMFfCgbONnkiQIVol/JJL7nRMi20fqzA4NRs9AfeqMGeRdPi3wIhYkxjeBaWh2rxwapn5Tu3IqOQ==
   dependencies:
     commondir "^1.0.1"
-    make-dir "^1.0.0"
+    make-dir "^2.0.0"
     pkg-dir "^3.0.0"
 
 find-cache-dir@^3.0.0:
@@ -4549,7 +4575,7 @@ glob-parent@^5.0.0:
   dependencies:
     is-glob "^4.0.1"
 
-glob@^7.0.0, glob@^7.0.3, glob@^7.1.1, glob@^7.1.2, glob@^7.1.3, glob@~7.1.1:
+glob@^7.0.0, glob@^7.0.3, glob@^7.1.1, glob@^7.1.2, glob@^7.1.3, glob@^7.1.4, glob@~7.1.1:
   version "7.1.4"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.4.tgz#aa608a2f6c577ad357e1ae5a5c26d9a8d1969255"
   integrity sha512-hkLPepehmnKk41pUGm3sYxoFs/umurYfYJCerbXEyFIWcAzvpipAgVkBqqT9RBKMGjnq6kMuyYwha6csxbiM1A==
@@ -5048,6 +5074,11 @@ indexof@0.0.1:
   resolved "https://registry.yarnpkg.com/indexof/-/indexof-0.0.1.tgz#82dc336d232b9062179d05ab3293a66059fd435d"
   integrity sha1-gtwzbSMrkGIXnQWrMpOmYFn9Q10=
 
+infer-owner@^1.0.3:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/infer-owner/-/infer-owner-1.0.4.tgz#c4cefcaa8e51051c2a40ba2ce8a3d27295af9467"
+  integrity sha512-IClj+Xz94+d7irH5qRyfJonOdfTzuDaifE6ZPWfx0N0+/ATZCbuTPq2prFl526urkQd90WyUKIh1DfBQ2hMz9A==
+
 inflight@^1.0.4:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/inflight/-/inflight-1.0.6.tgz#49bd6331d7d02d0c09bc910a1075ba8165b56df9"
@@ -6359,13 +6390,21 @@ lru-cache@^5.1.1:
   dependencies:
     yallist "^3.0.2"
 
-make-dir@^1.0.0, make-dir@^1.3.0:
+make-dir@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/make-dir/-/make-dir-1.3.0.tgz#79c1033b80515bd6d24ec9933e860ca75ee27f0c"
   integrity sha512-2w31R7SJtieJJnQtGc7RVL2StM2vGYVfqUOvUDxH6bC6aJTxPxTF0GnIgCyu7tjockiUWAYQRbxa7vKn34s5sQ==
   dependencies:
     pify "^3.0.0"
 
+make-dir@^2.0.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/make-dir/-/make-dir-2.1.0.tgz#5f0310e18b8be898cc07009295a30ae41e91e6f5"
+  integrity sha512-LS9X+dc8KLxXCb8dni79fLIIUA5VyZoyjSMCwTluaXA0o27cCK0bhXkpgw+sTXVpPy/lSO57ilRixqk0vDmtRA==
+  dependencies:
+    pify "^4.0.1"
+    semver "^5.6.0"
+
 make-dir@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/make-dir/-/make-dir-3.0.0.tgz#1b5f39f6b9270ed33f9f054c5c0f84304989f801"
@@ -9378,10 +9417,10 @@ source-map-support@^0.5.6:
     buffer-from "^1.0.0"
     source-map "^0.6.0"
 
-source-map-support@~0.5.10:
-  version "0.5.12"
-  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.12.tgz#b4f3b10d51857a5af0138d3ce8003b201613d599"
-  integrity sha512-4h2Pbvyy15EE02G+JOZpUCmqWJuqrs+sEkzewTm++BPi7Hvn/HwcqLAcNxYAyI0x13CpPPn+kMjl+hplXMHITQ==
+source-map-support@~0.5.12:
+  version "0.5.13"
+  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.13.tgz#31b24a9c2e73c2de85066c0feb7d44767ed52932"
+  integrity sha512-SHSKFHadjVA5oR4PPqhtAVdcBWwRYVd6g6cAXnIbRiIwc2EhPrTuKUBdSLvlEKyIP3GCf89fltvcZiP9MMFA1w==
   dependencies:
     buffer-from "^1.0.0"
     source-map "^0.6.0"
@@ -9796,30 +9835,29 @@ tcomb@^2.5.0:
   resolved "https://registry.yarnpkg.com/tcomb/-/tcomb-2.7.0.tgz#10d62958041669a5d53567b9a4ee8cde22b1c2b0"
   integrity sha1-ENYpWAQWaaXVNWe5pO6M3iKxwrA=
 
-terser-webpack-plugin@^1.1.0, terser-webpack-plugin@^1.3.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/terser-webpack-plugin/-/terser-webpack-plugin-1.3.0.tgz#69aa22426299f4b5b3775cbed8cb2c5d419aa1d4"
-  integrity sha512-W2YWmxPjjkUcOWa4pBEv4OP4er1aeQJlSo2UhtCFQCuRXEHjOFscO8VyWHj9JLlA0RzQb8Y2/Ta78XZvT54uGg==
+terser-webpack-plugin@^1.1.0, terser-webpack-plugin@^1.4.1:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/terser-webpack-plugin/-/terser-webpack-plugin-1.4.1.tgz#61b18e40eaee5be97e771cdbb10ed1280888c2b4"
+  integrity sha512-ZXmmfiwtCLfz8WKZyYUuuHf3dMYEjg8NrjHMb0JqHVHVOSkzp3cW2/XG1fP3tRhqEqSzMwzzRQGtAPbs4Cncxg==
   dependencies:
-    cacache "^11.3.2"
-    find-cache-dir "^2.0.0"
+    cacache "^12.0.2"
+    find-cache-dir "^2.1.0"
     is-wsl "^1.1.0"
-    loader-utils "^1.2.3"
     schema-utils "^1.0.0"
     serialize-javascript "^1.7.0"
     source-map "^0.6.1"
-    terser "^4.0.0"
-    webpack-sources "^1.3.0"
+    terser "^4.1.2"
+    webpack-sources "^1.4.0"
     worker-farm "^1.7.0"
 
-terser@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-4.0.0.tgz#ef356f6f359a963e2cc675517f21c1c382877374"
-  integrity sha512-dOapGTU0hETFl1tCo4t56FN+2jffoKyER9qBGoUFyZ6y7WLoKT0bF+lAYi6B6YsILcGF3q1C2FBh8QcKSCgkgA==
+terser@^4.1.2:
+  version "4.1.4"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-4.1.4.tgz#4478b6a08bb096a61e793fea1a4434408bab936c"
+  integrity sha512-+ZwXJvdSwbd60jG0Illav0F06GDJF0R4ydZ21Q3wGAFKoBGyJGo34F63vzJHgvYxc1ukOtIjvwEvl9MkjzM6Pg==
   dependencies:
-    commander "^2.19.0"
+    commander "^2.20.0"
     source-map "~0.6.1"
-    source-map-support "~0.5.10"
+    source-map-support "~0.5.12"
 
 test-exclude@^5.0.0:
   version "5.1.0"
@@ -10408,10 +10446,10 @@ webpack-merge@^4.2.1:
   dependencies:
     lodash "^4.17.5"
 
-webpack-sources@^1.0.0, webpack-sources@^1.0.1, webpack-sources@^1.1.0, webpack-sources@^1.3.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-1.3.0.tgz#2a28dcb9f1f45fe960d8f1493252b5ee6530fa85"
-  integrity sha512-OiVgSrbGu7NEnEvQJJgdSFPl2qWKkWq5lHMhgiToIiN9w34EBnjYzSYs+VbL5KoYiLNtFFa7BZIKxRED3I32pA==
+webpack-sources@^1.0.0, webpack-sources@^1.0.1, webpack-sources@^1.1.0, webpack-sources@^1.3.0, webpack-sources@^1.4.0:
+  version "1.4.3"
+  resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-1.4.3.tgz#eedd8ec0b928fbf1cbfe994e22d2d890f330a933"
+  integrity sha512-lgTS3Xhv1lCOKo7SA5TjKXMjpSM4sBjNV5+q2bqesbSPs5FjGmU6jjtBSkX9b4qW87vDIsCIlUPOEhbZrMdjeQ==
   dependencies:
     source-list-map "^2.0.0"
     source-map "~0.6.1"