diff --git a/fixtures/app/package.json b/fixtures/app/package.json
index cfe7f22..1f9474f 100644
--- a/fixtures/app/package.json
+++ b/fixtures/app/package.json
@@ -11,7 +11,7 @@
     "css-to-js-sourcemap-worker": "*"
   },
   "devDependencies": {
-    "webpack": "4.20.2",
+    "webpack": "4.28.1",
     "webpack-cli": "3.1.2"
   }
 }
diff --git a/worker/package.json b/worker/package.json
index 377eb9a..cdc7aed 100644
--- a/worker/package.json
+++ b/worker/package.json
@@ -12,7 +12,7 @@
   "devDependencies": {
     "css-to-js-sourcemap-core": "*",
     "resolve-from": "4.0.0",
-    "webpack": "4.20.2",
+    "webpack": "4.28.1",
     "webpack-cli": "3.1.2"
   },
   "license": "MIT"
diff --git a/yarn.lock b/yarn.lock
index 03162ae..a3d3ae4 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -96,129 +96,129 @@
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/@polka/url/-/url-0.5.0.tgz#b21510597fd601e5d7c95008b76bf0d254ebfd31"
 
-"@webassemblyjs/ast@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/ast/-/ast-1.7.8.tgz#f31f480debeef957f01b623f27eabc695fa4fe8f"
+"@webassemblyjs/ast@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/ast/-/ast-1.7.11.tgz#b988582cafbb2b095e8b556526f30c90d057cace"
   dependencies:
-    "@webassemblyjs/helper-module-context" "1.7.8"
-    "@webassemblyjs/helper-wasm-bytecode" "1.7.8"
-    "@webassemblyjs/wast-parser" "1.7.8"
+    "@webassemblyjs/helper-module-context" "1.7.11"
+    "@webassemblyjs/helper-wasm-bytecode" "1.7.11"
+    "@webassemblyjs/wast-parser" "1.7.11"
 
-"@webassemblyjs/floating-point-hex-parser@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/floating-point-hex-parser/-/floating-point-hex-parser-1.7.8.tgz#1b3ed0e27e384032254e9322fc646dd3e70ef1b9"
+"@webassemblyjs/floating-point-hex-parser@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/floating-point-hex-parser/-/floating-point-hex-parser-1.7.11.tgz#a69f0af6502eb9a3c045555b1a6129d3d3f2e313"
 
-"@webassemblyjs/helper-api-error@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-api-error/-/helper-api-error-1.7.8.tgz#a2b49c11f615e736f815ec927f035dcfa690d572"
+"@webassemblyjs/helper-api-error@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-api-error/-/helper-api-error-1.7.11.tgz#c7b6bb8105f84039511a2b39ce494f193818a32a"
 
-"@webassemblyjs/helper-buffer@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-buffer/-/helper-buffer-1.7.8.tgz#3fc66bfa09c1c60e824cf3d5887826fac062877d"
+"@webassemblyjs/helper-buffer@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-buffer/-/helper-buffer-1.7.11.tgz#3122d48dcc6c9456ed982debe16c8f37101df39b"
 
-"@webassemblyjs/helper-code-frame@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-code-frame/-/helper-code-frame-1.7.8.tgz#cc5a7e9522b70e7580df056dfd34020cf29645b0"
+"@webassemblyjs/helper-code-frame@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-code-frame/-/helper-code-frame-1.7.11.tgz#cf8f106e746662a0da29bdef635fcd3d1248364b"
   dependencies:
-    "@webassemblyjs/wast-printer" "1.7.8"
+    "@webassemblyjs/wast-printer" "1.7.11"
 
-"@webassemblyjs/helper-fsm@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-fsm/-/helper-fsm-1.7.8.tgz#fe4607430af466912797c21acafd3046080182ea"
+"@webassemblyjs/helper-fsm@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-fsm/-/helper-fsm-1.7.11.tgz#df38882a624080d03f7503f93e3f17ac5ac01181"
 
-"@webassemblyjs/helper-module-context@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-module-context/-/helper-module-context-1.7.8.tgz#3c2e7ee93d14ff4768ba66fb1be42fdc9dc7160a"
+"@webassemblyjs/helper-module-context@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-module-context/-/helper-module-context-1.7.11.tgz#d874d722e51e62ac202476935d649c802fa0e209"
 
-"@webassemblyjs/helper-wasm-bytecode@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-wasm-bytecode/-/helper-wasm-bytecode-1.7.8.tgz#89bdb78cd6dd5209ae2ed2925de78d0f0e00b6f0"
+"@webassemblyjs/helper-wasm-bytecode@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-wasm-bytecode/-/helper-wasm-bytecode-1.7.11.tgz#dd9a1e817f1c2eb105b4cf1013093cb9f3c9cb06"
 
-"@webassemblyjs/helper-wasm-section@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-wasm-section/-/helper-wasm-section-1.7.8.tgz#c68ef7d26a6fc12421b2e6e56f9bc810dfb33e87"
+"@webassemblyjs/helper-wasm-section@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/helper-wasm-section/-/helper-wasm-section-1.7.11.tgz#9c9ac41ecf9fbcfffc96f6d2675e2de33811e68a"
   dependencies:
-    "@webassemblyjs/ast" "1.7.8"
-    "@webassemblyjs/helper-buffer" "1.7.8"
-    "@webassemblyjs/helper-wasm-bytecode" "1.7.8"
-    "@webassemblyjs/wasm-gen" "1.7.8"
+    "@webassemblyjs/ast" "1.7.11"
+    "@webassemblyjs/helper-buffer" "1.7.11"
+    "@webassemblyjs/helper-wasm-bytecode" "1.7.11"
+    "@webassemblyjs/wasm-gen" "1.7.11"
 
-"@webassemblyjs/ieee754@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/ieee754/-/ieee754-1.7.8.tgz#1f37974b13cb486a9237e73ce04cac7a2f1265ed"
+"@webassemblyjs/ieee754@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/ieee754/-/ieee754-1.7.11.tgz#c95839eb63757a31880aaec7b6512d4191ac640b"
   dependencies:
     "@xtuc/ieee754" "^1.2.0"
 
-"@webassemblyjs/leb128@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/leb128/-/leb128-1.7.8.tgz#1bee83426819192db2ea1a234b84c7ebc6d34c1f"
+"@webassemblyjs/leb128@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/leb128/-/leb128-1.7.11.tgz#d7267a1ee9c4594fd3f7e37298818ec65687db63"
   dependencies:
     "@xtuc/long" "4.2.1"
 
-"@webassemblyjs/utf8@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/utf8/-/utf8-1.7.8.tgz#2b489d5cf43e0aebb93d8e2d792aff9879c61f05"
-
-"@webassemblyjs/wasm-edit@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/wasm-edit/-/wasm-edit-1.7.8.tgz#f8bdbe7088718eca27b1c349bb7c06b8a457950c"
-  dependencies:
-    "@webassemblyjs/ast" "1.7.8"
-    "@webassemblyjs/helper-buffer" "1.7.8"
-    "@webassemblyjs/helper-wasm-bytecode" "1.7.8"
-    "@webassemblyjs/helper-wasm-section" "1.7.8"
-    "@webassemblyjs/wasm-gen" "1.7.8"
-    "@webassemblyjs/wasm-opt" "1.7.8"
-    "@webassemblyjs/wasm-parser" "1.7.8"
-    "@webassemblyjs/wast-printer" "1.7.8"
-
-"@webassemblyjs/wasm-gen@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/wasm-gen/-/wasm-gen-1.7.8.tgz#7e8abf1545eae74ac6781d545c034af3cfd0c7d5"
-  dependencies:
-    "@webassemblyjs/ast" "1.7.8"
-    "@webassemblyjs/helper-wasm-bytecode" "1.7.8"
-    "@webassemblyjs/ieee754" "1.7.8"
-    "@webassemblyjs/leb128" "1.7.8"
-    "@webassemblyjs/utf8" "1.7.8"
-
-"@webassemblyjs/wasm-opt@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/wasm-opt/-/wasm-opt-1.7.8.tgz#7ada6e211914728fce02ff0ff9c344edc6d41f26"
-  dependencies:
-    "@webassemblyjs/ast" "1.7.8"
-    "@webassemblyjs/helper-buffer" "1.7.8"
-    "@webassemblyjs/wasm-gen" "1.7.8"
-    "@webassemblyjs/wasm-parser" "1.7.8"
-
-"@webassemblyjs/wasm-parser@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/wasm-parser/-/wasm-parser-1.7.8.tgz#dac47c291fb6a3e63529aecd647592cd34afbf94"
-  dependencies:
-    "@webassemblyjs/ast" "1.7.8"
-    "@webassemblyjs/helper-api-error" "1.7.8"
-    "@webassemblyjs/helper-wasm-bytecode" "1.7.8"
-    "@webassemblyjs/ieee754" "1.7.8"
-    "@webassemblyjs/leb128" "1.7.8"
-    "@webassemblyjs/utf8" "1.7.8"
-
-"@webassemblyjs/wast-parser@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/wast-parser/-/wast-parser-1.7.8.tgz#f8aab9a450c048c1f9537695c89faeb92fabfba5"
-  dependencies:
-    "@webassemblyjs/ast" "1.7.8"
-    "@webassemblyjs/floating-point-hex-parser" "1.7.8"
-    "@webassemblyjs/helper-api-error" "1.7.8"
-    "@webassemblyjs/helper-code-frame" "1.7.8"
-    "@webassemblyjs/helper-fsm" "1.7.8"
+"@webassemblyjs/utf8@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/utf8/-/utf8-1.7.11.tgz#06d7218ea9fdc94a6793aa92208160db3d26ee82"
+
+"@webassemblyjs/wasm-edit@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/wasm-edit/-/wasm-edit-1.7.11.tgz#8c74ca474d4f951d01dbae9bd70814ee22a82005"
+  dependencies:
+    "@webassemblyjs/ast" "1.7.11"
+    "@webassemblyjs/helper-buffer" "1.7.11"
+    "@webassemblyjs/helper-wasm-bytecode" "1.7.11"
+    "@webassemblyjs/helper-wasm-section" "1.7.11"
+    "@webassemblyjs/wasm-gen" "1.7.11"
+    "@webassemblyjs/wasm-opt" "1.7.11"
+    "@webassemblyjs/wasm-parser" "1.7.11"
+    "@webassemblyjs/wast-printer" "1.7.11"
+
+"@webassemblyjs/wasm-gen@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/wasm-gen/-/wasm-gen-1.7.11.tgz#9bbba942f22375686a6fb759afcd7ac9c45da1a8"
+  dependencies:
+    "@webassemblyjs/ast" "1.7.11"
+    "@webassemblyjs/helper-wasm-bytecode" "1.7.11"
+    "@webassemblyjs/ieee754" "1.7.11"
+    "@webassemblyjs/leb128" "1.7.11"
+    "@webassemblyjs/utf8" "1.7.11"
+
+"@webassemblyjs/wasm-opt@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/wasm-opt/-/wasm-opt-1.7.11.tgz#b331e8e7cef8f8e2f007d42c3a36a0580a7d6ca7"
+  dependencies:
+    "@webassemblyjs/ast" "1.7.11"
+    "@webassemblyjs/helper-buffer" "1.7.11"
+    "@webassemblyjs/wasm-gen" "1.7.11"
+    "@webassemblyjs/wasm-parser" "1.7.11"
+
+"@webassemblyjs/wasm-parser@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/wasm-parser/-/wasm-parser-1.7.11.tgz#6e3d20fa6a3519f6b084ef9391ad58211efb0a1a"
+  dependencies:
+    "@webassemblyjs/ast" "1.7.11"
+    "@webassemblyjs/helper-api-error" "1.7.11"
+    "@webassemblyjs/helper-wasm-bytecode" "1.7.11"
+    "@webassemblyjs/ieee754" "1.7.11"
+    "@webassemblyjs/leb128" "1.7.11"
+    "@webassemblyjs/utf8" "1.7.11"
+
+"@webassemblyjs/wast-parser@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/wast-parser/-/wast-parser-1.7.11.tgz#25bd117562ca8c002720ff8116ef9072d9ca869c"
+  dependencies:
+    "@webassemblyjs/ast" "1.7.11"
+    "@webassemblyjs/floating-point-hex-parser" "1.7.11"
+    "@webassemblyjs/helper-api-error" "1.7.11"
+    "@webassemblyjs/helper-code-frame" "1.7.11"
+    "@webassemblyjs/helper-fsm" "1.7.11"
     "@xtuc/long" "4.2.1"
 
-"@webassemblyjs/wast-printer@1.7.8":
-  version "1.7.8"
-  resolved "https://registry.yarnpkg.com/@webassemblyjs/wast-printer/-/wast-printer-1.7.8.tgz#e7e965782c1912f6a965f14a53ff43d8ad0403a5"
+"@webassemblyjs/wast-printer@1.7.11":
+  version "1.7.11"
+  resolved "https://registry.yarnpkg.com/@webassemblyjs/wast-printer/-/wast-printer-1.7.11.tgz#c4245b6de242cb50a2cc950174fdbf65c78d7813"
   dependencies:
-    "@webassemblyjs/ast" "1.7.8"
-    "@webassemblyjs/wast-parser" "1.7.8"
+    "@webassemblyjs/ast" "1.7.11"
+    "@webassemblyjs/wast-parser" "1.7.11"
     "@xtuc/long" "4.2.1"
 
 "@xtuc/ieee754@^1.2.0":
@@ -253,6 +253,10 @@ acorn@^5.0.3, acorn@^5.6.0:
   version "5.7.3"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.7.3.tgz#67aa231bf8812974b85235a96771eb6bd07ea279"
 
+ajv-errors@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/ajv-errors/-/ajv-errors-1.0.1.tgz#f35986aceb91afadec4102fbd85014950cefa64d"
+
 ajv-keywords@^3.1.0:
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/ajv-keywords/-/ajv-keywords-3.2.0.tgz#e86b819c602cf8821ad637413698f1dec021847a"
@@ -416,9 +420,9 @@ binary-extensions@^1.0.0:
   version "1.11.0"
   resolved "https://registry.yarnpkg.com/binary-extensions/-/binary-extensions-1.11.0.tgz#46aa1751fb6a2f93ee5e689bb1087d4b14c6c205"
 
-bluebird@^3.5.1:
-  version "3.5.1"
-  resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.1.tgz#d9551f9de98f1fcda1e683d17ee91a0602ee2eb9"
+bluebird@^3.5.3:
+  version "3.5.3"
+  resolved "https://registry.yarnpkg.com/bluebird/-/bluebird-3.5.3.tgz#7d01c6f9616c9a51ab0f8c549a79dfe6ec33efa7"
 
 bn.js@^4.0.0, bn.js@^4.1.0, bn.js@^4.1.1, bn.js@^4.4.0:
   version "4.11.8"
@@ -522,22 +526,23 @@ builtin-status-codes@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/builtin-status-codes/-/builtin-status-codes-3.0.0.tgz#85982878e21b98e1c66425e03d0174788f569ee8"
 
-cacache@^10.0.4:
-  version "10.0.4"
-  resolved "https://registry.yarnpkg.com/cacache/-/cacache-10.0.4.tgz#6452367999eff9d4188aefd9a14e9d7c6a263460"
-  dependencies:
-    bluebird "^3.5.1"
-    chownr "^1.0.1"
-    glob "^7.1.2"
-    graceful-fs "^4.1.11"
-    lru-cache "^4.1.1"
-    mississippi "^2.0.0"
+cacache@^11.0.2:
+  version "11.3.2"
+  resolved "https://registry.yarnpkg.com/cacache/-/cacache-11.3.2.tgz#2d81e308e3d258ca38125b676b98b2ac9ce69bfa"
+  dependencies:
+    bluebird "^3.5.3"
+    chownr "^1.1.1"
+    figgy-pudding "^3.5.1"
+    glob "^7.1.3"
+    graceful-fs "^4.1.15"
+    lru-cache "^5.1.1"
+    mississippi "^3.0.0"
     mkdirp "^0.5.1"
     move-concurrently "^1.0.1"
     promise-inflight "^1.0.1"
     rimraf "^2.6.2"
-    ssri "^5.2.4"
-    unique-filename "^1.1.0"
+    ssri "^6.0.1"
+    unique-filename "^1.1.1"
     y18n "^4.0.0"
 
 cache-base@^1.0.1:
@@ -602,6 +607,10 @@ chownr@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/chownr/-/chownr-1.0.1.tgz#e2a75042a9551908bebd25b8523d5f9769d79181"
 
+chownr@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/chownr/-/chownr-1.1.1.tgz#54726b8b8fff4df053c42187e801fb4412df1494"
+
 chrome-trace-event@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/chrome-trace-event/-/chrome-trace-event-1.0.0.tgz#45a91bd2c20c9411f0963b5aaeb9a1b95e09cc48"
@@ -667,9 +676,9 @@ color-name@^1.1.1:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
 
-commander@~2.13.0:
-  version "2.13.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.13.0.tgz#6964bca67685df7c1f1430c584f07d7597885b9c"
+commander@~2.17.1:
+  version "2.17.1"
+  resolved "https://registry.yarnpkg.com/commander/-/commander-2.17.1.tgz#bd77ab7de6de94205ceacc72f1716d29f20a77bf"
 
 commondir@^1.0.1:
   version "1.0.1"
@@ -1130,6 +1139,10 @@ fast-levenshtein@~2.0.4:
   version "2.0.6"
   resolved "https://registry.yarnpkg.com/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz#3d8a5c66883a16a30ca8643e851f19baa7797917"
 
+figgy-pudding@^3.5.1:
+  version "3.5.1"
+  resolved "https://registry.yarnpkg.com/figgy-pudding/-/figgy-pudding-3.5.1.tgz#862470112901c727a0e495a80744bd5baa1d6790"
+
 figures@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/figures/-/figures-2.0.0.tgz#3ab1a2d2a62c8bfb431a0c94cb797a2fce27c962"
@@ -1152,19 +1165,13 @@ fill-range@^4.0.0:
     repeat-string "^1.6.1"
     to-regex-range "^2.1.0"
 
-find-cache-dir@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/find-cache-dir/-/find-cache-dir-1.0.0.tgz#9288e3e9e3cc3748717d39eade17cf71fc30ee6f"
+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"
   dependencies:
     commondir "^1.0.1"
     make-dir "^1.0.0"
-    pkg-dir "^2.0.0"
-
-find-up@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/find-up/-/find-up-2.1.0.tgz#45d1b7e506c717ddd482775a2b77920a3c0c57a7"
-  dependencies:
-    locate-path "^2.0.0"
+    pkg-dir "^3.0.0"
 
 find-up@^3.0.0:
   version "3.0.0"
@@ -1278,6 +1285,17 @@ glob@^7.0.3, glob@^7.0.5, glob@^7.1.2:
     once "^1.3.0"
     path-is-absolute "^1.0.0"
 
+glob@^7.1.3:
+  version "7.1.3"
+  resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.3.tgz#3960832d3f1574108342dafd3a67b332c0969df1"
+  dependencies:
+    fs.realpath "^1.0.0"
+    inflight "^1.0.4"
+    inherits "2"
+    minimatch "^3.0.4"
+    once "^1.3.0"
+    path-is-absolute "^1.0.0"
+
 global-modules-path@^2.3.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/global-modules-path/-/global-modules-path-2.3.0.tgz#b0e2bac6beac39745f7db5c59d26a36a0b94f7dc"
@@ -1309,7 +1327,11 @@ globrex@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/globrex/-/globrex-0.1.1.tgz#cfe565cfa910707d0ef98eb0b9d78c3c055ca2ef"
 
-graceful-fs@^4.1.11, graceful-fs@^4.1.2:
+graceful-fs@^4.1.15:
+  version "4.1.15"
+  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.15.tgz#ffb703e1066e8a0eeaa4c8b80ba9253eeefbfb00"
+
+graceful-fs@^4.1.2:
   version "4.1.11"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.1.11.tgz#0e8bdfe4d1ddb8854d64e04ea7c00e2a026e5658"
 
@@ -1710,13 +1732,6 @@ loader-utils@^1.1.0:
     emojis-list "^2.0.0"
     json5 "^0.5.0"
 
-locate-path@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-2.0.0.tgz#2b568b265eec944c6d9c0de9c3dbbbca0354cd8e"
-  dependencies:
-    p-locate "^2.0.0"
-    path-exists "^3.0.0"
-
 locate-path@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/locate-path/-/locate-path-3.0.0.tgz#dbec3b3ab759758071b58fe59fc41871af21400e"
@@ -1738,12 +1753,11 @@ loose-envify@^1.0.0:
   dependencies:
     js-tokens "^3.0.0"
 
-lru-cache@^4.1.1:
-  version "4.1.3"
-  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-4.1.3.tgz#a1175cf3496dfc8436c156c334b4955992bce69c"
+lru-cache@^5.1.1:
+  version "5.1.1"
+  resolved "https://registry.yarnpkg.com/lru-cache/-/lru-cache-5.1.1.tgz#1da27e6710271947695daf6848e847f01d84b920"
   dependencies:
-    pseudomap "^1.0.2"
-    yallist "^2.1.2"
+    yallist "^3.0.2"
 
 make-dir@^1.0.0:
   version "1.3.0"
@@ -1857,9 +1871,9 @@ minizlib@^1.1.0:
   dependencies:
     minipass "^2.2.1"
 
-mississippi@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/mississippi/-/mississippi-2.0.0.tgz#3442a508fafc28500486feea99409676e4ee5a6f"
+mississippi@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/mississippi/-/mississippi-3.0.0.tgz#ea0a3291f97e0b5e8776b363d5f0a12d94c67022"
   dependencies:
     concat-stream "^1.5.0"
     duplexify "^3.4.2"
@@ -1867,7 +1881,7 @@ mississippi@^2.0.0:
     flush-write-stream "^1.0.0"
     from2 "^2.1.0"
     parallel-transform "^1.1.0"
-    pump "^2.0.1"
+    pump "^3.0.0"
     pumpify "^1.3.3"
     stream-each "^1.1.0"
     through2 "^2.0.0"
@@ -2121,34 +2135,18 @@ p-is-promise@^1.1.0:
   version "1.1.0"
   resolved "http://registry.npmjs.org/p-is-promise/-/p-is-promise-1.1.0.tgz#9c9456989e9f6588017b0434d56097675c3da05e"
 
-p-limit@^1.1.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-1.3.0.tgz#b86bd5f0c25690911c7590fcbfc2010d54b3ccb8"
-  dependencies:
-    p-try "^1.0.0"
-
 p-limit@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-2.0.0.tgz#e624ed54ee8c460a778b3c9f3670496ff8a57aec"
   dependencies:
     p-try "^2.0.0"
 
-p-locate@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/p-locate/-/p-locate-2.0.0.tgz#20a0103b222a70c8fd39cc2e580680f3dde5ec43"
-  dependencies:
-    p-limit "^1.1.0"
-
 p-locate@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/p-locate/-/p-locate-3.0.0.tgz#322d69a05c0264b25997d9f40cd8a891ab0064a4"
   dependencies:
     p-limit "^2.0.0"
 
-p-try@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/p-try/-/p-try-1.0.0.tgz#cbc79cdbaf8fd4228e13f621f2b1a237c1b207b3"
-
 p-try@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/p-try/-/p-try-2.0.0.tgz#85080bb87c64688fa47996fe8f7dfbe8211760b1"
@@ -2231,12 +2229,6 @@ pinkie@^2.0.0:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
 
-pkg-dir@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/pkg-dir/-/pkg-dir-2.0.0.tgz#f6d5d1109e19d63edf428e0bd57e12777615334b"
-  dependencies:
-    find-up "^2.1.0"
-
 pkg-dir@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/pkg-dir/-/pkg-dir-3.0.0.tgz#2749020f239ed990881b1f71210d51eb6523bea3"
@@ -2279,10 +2271,6 @@ prr@~1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/prr/-/prr-1.0.1.tgz#d3fc114ba06995a45ec6893f484ceb1d78f5f476"
 
-pseudomap@^1.0.2:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/pseudomap/-/pseudomap-1.0.2.tgz#f052a28da70e618917ef0a8ac34c1ae5a68286b3"
-
 public-encrypt@^4.0.0:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/public-encrypt/-/public-encrypt-4.0.2.tgz#46eb9107206bf73489f8b85b69d91334c6610994"
@@ -2293,13 +2281,20 @@ public-encrypt@^4.0.0:
     parse-asn1 "^5.0.0"
     randombytes "^2.0.1"
 
-pump@^2.0.0, pump@^2.0.1:
+pump@^2.0.0:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/pump/-/pump-2.0.1.tgz#12399add6e4cf7526d973cbc8b5ce2e2908b3909"
   dependencies:
     end-of-stream "^1.1.0"
     once "^1.3.1"
 
+pump@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/pump/-/pump-3.0.0.tgz#b4a2116815bde2f4e1ea602354e8c75565107a64"
+  dependencies:
+    end-of-stream "^1.1.0"
+    once "^1.3.1"
+
 pumpify@^1.3.3:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/pumpify/-/pumpify-1.5.1.tgz#36513be246ab27570b1a374a5ce278bfd74370ce"
@@ -2491,13 +2486,21 @@ sax@^1.2.4:
   version "1.2.4"
   resolved "https://registry.yarnpkg.com/sax/-/sax-1.2.4.tgz#2816234e2378bddc4e5354fab5caa895df7100d9"
 
-schema-utils@^0.4.4, schema-utils@^0.4.5:
+schema-utils@^0.4.4:
   version "0.4.5"
   resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-0.4.5.tgz#21836f0608aac17b78f9e3e24daff14a5ca13a3e"
   dependencies:
     ajv "^6.1.0"
     ajv-keywords "^3.1.0"
 
+schema-utils@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-1.0.0.tgz#0b79a93204d7b600d4b2850d1f66c2a34951c770"
+  dependencies:
+    ajv "^6.1.0"
+    ajv-errors "^1.0.0"
+    ajv-keywords "^3.1.0"
+
 semver@^5.3.0, semver@^5.5.0:
   version "5.5.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"
@@ -2616,6 +2619,13 @@ source-map-resolve@^0.5.0:
     source-map-url "^0.4.0"
     urix "^0.1.0"
 
+source-map-support@~0.5.6:
+  version "0.5.9"
+  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.9.tgz#41bc953b2534267ea2d605bccfa7bfa3111ced5f"
+  dependencies:
+    buffer-from "^1.0.0"
+    source-map "^0.6.0"
+
 source-map-url@0.4.0, source-map-url@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.0.tgz#3e935d7ddd73631b97659956d55128e87b5084a3"
@@ -2628,7 +2638,7 @@ source-map@^0.5.0, source-map@^0.5.6:
   version "0.5.7"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
 
-source-map@^0.6.1, source-map@~0.6.1:
+source-map@^0.6.0, source-map@^0.6.1, source-map@~0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.6.1.tgz#74722af32e9614e9c287a8d0bbde48b5e2f1a263"
 
@@ -2646,11 +2656,11 @@ sprintf-js@~1.0.2:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/sprintf-js/-/sprintf-js-1.0.3.tgz#04e6926f662895354f3dd015203633b857297e2c"
 
-ssri@^5.2.4:
-  version "5.3.0"
-  resolved "https://registry.yarnpkg.com/ssri/-/ssri-5.3.0.tgz#ba3872c9c6d33a0704a7d71ff045e5ec48999d06"
+ssri@^6.0.1:
+  version "6.0.1"
+  resolved "https://registry.yarnpkg.com/ssri/-/ssri-6.0.1.tgz#2a3c41b28dd45b62b63676ecb74001265ae9edd8"
   dependencies:
-    safe-buffer "^5.1.1"
+    figgy-pudding "^3.5.1"
 
 stackframe@^1.0.4:
   version "1.0.4"
@@ -2773,6 +2783,27 @@ tar@^4:
     safe-buffer "^5.1.2"
     yallist "^3.0.2"
 
+terser-webpack-plugin@^1.1.0:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/terser-webpack-plugin/-/terser-webpack-plugin-1.2.1.tgz#7545da9ae5f4f9ae6a0ac961eb46f5e7c845cc26"
+  dependencies:
+    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"
+
+terser@^3.8.1:
+  version "3.14.1"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-3.14.1.tgz#cc4764014af570bc79c79742358bd46926018a32"
+  dependencies:
+    commander "~2.17.1"
+    source-map "~0.6.1"
+    source-map-support "~0.5.6"
+
 text-table@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/text-table/-/text-table-0.2.0.tgz#7f5ee823ae805207c00af2df4a84ec3fcfa570b4"
@@ -2859,26 +2890,6 @@ typedarray@^0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
 
-uglify-es@^3.3.4:
-  version "3.3.9"
-  resolved "https://registry.yarnpkg.com/uglify-es/-/uglify-es-3.3.9.tgz#0c1c4f0700bed8dbc124cdb304d2592ca203e677"
-  dependencies:
-    commander "~2.13.0"
-    source-map "~0.6.1"
-
-uglifyjs-webpack-plugin@^1.2.4:
-  version "1.2.5"
-  resolved "https://registry.yarnpkg.com/uglifyjs-webpack-plugin/-/uglifyjs-webpack-plugin-1.2.5.tgz#2ef8387c8f1a903ec5e44fa36f9f3cbdcea67641"
-  dependencies:
-    cacache "^10.0.4"
-    find-cache-dir "^1.0.0"
-    schema-utils "^0.4.5"
-    serialize-javascript "^1.4.0"
-    source-map "^0.6.1"
-    uglify-es "^3.3.4"
-    webpack-sources "^1.1.0"
-    worker-farm "^1.5.2"
-
 union-value@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/union-value/-/union-value-1.0.0.tgz#5c71c34cb5bad5dcebe3ea0cd08207ba5aa1aea4"
@@ -2888,9 +2899,9 @@ union-value@^1.0.0:
     is-extendable "^0.1.1"
     set-value "^0.4.3"
 
-unique-filename@^1.1.0:
-  version "1.1.0"
-  resolved "https://registry.yarnpkg.com/unique-filename/-/unique-filename-1.1.0.tgz#d05f2fe4032560871f30e93cbe735eea201514f3"
+unique-filename@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/unique-filename/-/unique-filename-1.1.1.tgz#1d69769369ada0583103a1e6ae87681b56573230"
   dependencies:
     unique-slug "^2.0.0"
 
@@ -2997,14 +3008,14 @@ webpack-sources@^1.3.0:
     source-list-map "^2.0.0"
     source-map "~0.6.1"
 
-webpack@4.20.2:
-  version "4.20.2"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.20.2.tgz#89f6486b6bb276a91b0823453d377501fc625b5a"
+webpack@4.28.1:
+  version "4.28.1"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.28.1.tgz#d0e2856e75d1224b170bf16c30b6ca9b75f0d958"
   dependencies:
-    "@webassemblyjs/ast" "1.7.8"
-    "@webassemblyjs/helper-module-context" "1.7.8"
-    "@webassemblyjs/wasm-edit" "1.7.8"
-    "@webassemblyjs/wasm-parser" "1.7.8"
+    "@webassemblyjs/ast" "1.7.11"
+    "@webassemblyjs/helper-module-context" "1.7.11"
+    "@webassemblyjs/wasm-edit" "1.7.11"
+    "@webassemblyjs/wasm-parser" "1.7.11"
     acorn "^5.6.2"
     acorn-dynamic-import "^3.0.0"
     ajv "^6.1.0"
@@ -3022,7 +3033,7 @@ webpack@4.20.2:
     node-libs-browser "^2.0.0"
     schema-utils "^0.4.4"
     tapable "^1.1.0"
-    uglifyjs-webpack-plugin "^1.2.4"
+    terser-webpack-plugin "^1.1.0"
     watchpack "^1.5.0"
     webpack-sources "^1.3.0"
 
@@ -3081,10 +3092,6 @@ xtend@^4.0.0, xtend@~4.0.1:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/y18n/-/y18n-4.0.0.tgz#95ef94f85ecc81d007c264e190a120f0a3c8566b"
 
-yallist@^2.1.2:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/yallist/-/yallist-2.1.2.tgz#1c11f9218f076089a47dd512f93c6699a6a81d52"
-
 yallist@^3.0.0, yallist@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/yallist/-/yallist-3.0.2.tgz#8452b4bb7e83c7c188d8041c1a837c773d6d8bb9"