diff --git a/package.json b/package.json
index 24662893eac..85f49aa00b5 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "command-exists": "^1.2.6",
     "commander": "^2.11.0",
     "cross-spawn": "^6.0.4",
-    "cssnano": "^3.10.0",
+    "cssnano": "^4.0.0",
     "deasync": "^0.1.13",
     "dotenv": "^5.0.0",
     "fast-glob": "^2.2.2",
diff --git a/yarn.lock b/yarn.lock
index a411044b0b2..0253a4132cc 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -122,7 +122,7 @@ align-text@^0.1.1, align-text@^0.1.3:
     longest "^1.0.1"
     repeat-string "^1.5.2"
 
-alphanum-sort@^1.0.1, alphanum-sort@^1.0.2:
+alphanum-sort@^1.0.0, alphanum-sort@^1.0.1, alphanum-sort@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/alphanum-sort/-/alphanum-sort-1.0.2.tgz#97a1119649b211ad33691d9f9f486a8ec9fbe0a3"
 
@@ -1059,6 +1059,13 @@ browserslist@^1.3.6, browserslist@^1.5.2, browserslist@^1.7.6:
     caniuse-db "^1.0.30000639"
     electron-to-chromium "^1.2.7"
 
+browserslist@^2.0.0:
+  version "2.11.3"
+  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-2.11.3.tgz#fe36167aed1bbcde4827ebfe71347a2cc70b99b2"
+  dependencies:
+    caniuse-lite "^1.0.30000792"
+    electron-to-chromium "^1.3.30"
+
 browserslist@^3.2.6:
   version "3.2.6"
   resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-3.2.6.tgz#138a44d04a9af64443679191d041f28ce5b965d5"
@@ -1066,6 +1073,14 @@ browserslist@^3.2.6:
     caniuse-lite "^1.0.30000830"
     electron-to-chromium "^1.3.42"
 
+browserslist@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-4.0.0.tgz#48703f1ed7ef981c6719e39e9444f20632b06571"
+  dependencies:
+    caniuse-lite "^1.0.30000859"
+    electron-to-chromium "^1.3.50"
+    node-releases "^1.0.0-alpha.10"
+
 bsb-js@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/bsb-js/-/bsb-js-1.0.2.tgz#b9e7af1dfdb8de6191bb36fdff43f59359a7dfe7"
@@ -1170,10 +1185,23 @@ caniuse-api@^1.5.2:
     lodash.memoize "^4.1.2"
     lodash.uniq "^4.5.0"
 
+caniuse-api@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/caniuse-api/-/caniuse-api-2.0.0.tgz#b1ddb5a5966b16f48dc4998444d4bbc6c7d9d834"
+  dependencies:
+    browserslist "^2.0.0"
+    caniuse-lite "^1.0.0"
+    lodash.memoize "^4.1.2"
+    lodash.uniq "^4.5.0"
+
 caniuse-db@^1.0.30000529, caniuse-db@^1.0.30000634, caniuse-db@^1.0.30000639:
   version "1.0.30000832"
   resolved "https://registry.yarnpkg.com/caniuse-db/-/caniuse-db-1.0.30000832.tgz#afe34c9f7c62139fd1c607db2ab7308bbb6a5158"
 
+caniuse-lite@^1.0.0, caniuse-lite@^1.0.30000792, caniuse-lite@^1.0.30000859:
+  version "1.0.30000862"
+  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000862.tgz#7ca14f5079fa8f77ac814fca92d45deb4b7eff9d"
+
 caniuse-lite@^1.0.30000830:
   version "1.0.30000832"
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000832.tgz#22a277f1d623774cc9aea2f7c1a65cb1603c63b8"
@@ -1402,6 +1430,16 @@ color-convert@^1.3.0, color-convert@^1.9.0:
   dependencies:
     color-name "^1.1.1"
 
+color-convert@^1.9.1:
+  version "1.9.2"
+  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.2.tgz#49881b8fba67df12a96bdf3f56c0aab9e7913147"
+  dependencies:
+    color-name "1.1.1"
+
+color-name@1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.1.tgz#4b1415304cf50028ea81643643bd82ea05803689"
+
 color-name@^1.0.0, color-name@^1.1.1:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
@@ -1412,6 +1450,13 @@ color-string@^0.3.0:
   dependencies:
     color-name "^1.0.0"
 
+color-string@^1.5.2:
+  version "1.5.2"
+  resolved "https://registry.yarnpkg.com/color-string/-/color-string-1.5.2.tgz#26e45814bc3c9a7cbd6751648a41434514a773a9"
+  dependencies:
+    color-name "^1.0.0"
+    simple-swizzle "^0.2.2"
+
 color@^0.11.0:
   version "0.11.4"
   resolved "https://registry.yarnpkg.com/color/-/color-0.11.4.tgz#6d7b5c74fb65e841cd48792ad1ed5e07b904d764"
@@ -1420,6 +1465,13 @@ color@^0.11.0:
     color-convert "^1.3.0"
     color-string "^0.3.0"
 
+color@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/color/-/color-3.0.0.tgz#d920b4328d534a3ac8295d68f7bd4ba6c427be9a"
+  dependencies:
+    color-convert "^1.9.1"
+    color-string "^1.5.2"
+
 colormin@^1.0.5:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/colormin/-/colormin-1.1.2.tgz#ea2f7420a72b96881a38aae59ec124a6f7298133"
@@ -1539,7 +1591,7 @@ core-util-is@1.0.2, core-util-is@~1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
 
-cosmiconfig@^5.0.2:
+cosmiconfig@^5.0.0, cosmiconfig@^5.0.2:
   version "5.0.5"
   resolved "https://registry.yarnpkg.com/cosmiconfig/-/cosmiconfig-5.0.5.tgz#a809e3c2306891ce17ab70359dc8bdf661fe2cd0"
   dependencies:
@@ -1642,10 +1694,17 @@ crypto-browserify@^3.11.0:
     randombytes "^2.0.0"
     randomfill "^1.0.3"
 
-css-color-names@0.0.4:
+css-color-names@0.0.4, css-color-names@^0.0.4:
   version "0.0.4"
   resolved "https://registry.yarnpkg.com/css-color-names/-/css-color-names-0.0.4.tgz#808adc2e79cf84738069b646cb20ec27beb629e0"
 
+css-declaration-sorter@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/css-declaration-sorter/-/css-declaration-sorter-3.0.1.tgz#d0e3056b0fd88dc1ea9dceff435adbe9c702a7f8"
+  dependencies:
+    postcss "^6.0.0"
+    timsort "^0.3.0"
+
 css-modules-loader-core@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/css-modules-loader-core/-/css-modules-loader-core-1.1.0.tgz#5908668294a1becd261ae0a4ce21b0b551f21d16"
@@ -1696,6 +1755,10 @@ css-tree@1.0.0-alpha25:
     mdn-data "^1.0.0"
     source-map "^0.5.3"
 
+css-unit-converter@^1.1.1:
+  version "1.1.1"
+  resolved "https://registry.yarnpkg.com/css-unit-converter/-/css-unit-converter-1.1.1.tgz#d9b9281adcfd8ced935bdbaba83786897f64e996"
+
 css-url-regex@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/css-url-regex/-/css-url-regex-1.1.0.tgz#83834230cc9f74c457de59eebd1543feeb83b7ec"
@@ -1708,7 +1771,60 @@ cssesc@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-0.1.0.tgz#c814903e45623371a0477b40109aaafbeeaddbb4"
 
-cssnano@^3.10.0, cssnano@^3.4.0:
+cssnano-preset-default@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/cssnano-preset-default/-/cssnano-preset-default-4.0.0.tgz#c334287b4f7d49fb2d170a92f9214655788e3b6b"
+  dependencies:
+    css-declaration-sorter "^3.0.0"
+    cssnano-util-raw-cache "^4.0.0"
+    postcss "^6.0.0"
+    postcss-calc "^6.0.0"
+    postcss-colormin "^4.0.0"
+    postcss-convert-values "^4.0.0"
+    postcss-discard-comments "^4.0.0"
+    postcss-discard-duplicates "^4.0.0"
+    postcss-discard-empty "^4.0.0"
+    postcss-discard-overridden "^4.0.0"
+    postcss-merge-longhand "^4.0.0"
+    postcss-merge-rules "^4.0.0"
+    postcss-minify-font-values "^4.0.0"
+    postcss-minify-gradients "^4.0.0"
+    postcss-minify-params "^4.0.0"
+    postcss-minify-selectors "^4.0.0"
+    postcss-normalize-charset "^4.0.0"
+    postcss-normalize-display-values "^4.0.0"
+    postcss-normalize-positions "^4.0.0"
+    postcss-normalize-repeat-style "^4.0.0"
+    postcss-normalize-string "^4.0.0"
+    postcss-normalize-timing-functions "^4.0.0"
+    postcss-normalize-unicode "^4.0.0"
+    postcss-normalize-url "^4.0.0"
+    postcss-normalize-whitespace "^4.0.0"
+    postcss-ordered-values "^4.0.0"
+    postcss-reduce-initial "^4.0.0"
+    postcss-reduce-transforms "^4.0.0"
+    postcss-svgo "^4.0.0"
+    postcss-unique-selectors "^4.0.0"
+
+cssnano-util-get-arguments@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/cssnano-util-get-arguments/-/cssnano-util-get-arguments-4.0.0.tgz#ed3a08299f21d75741b20f3b81f194ed49cc150f"
+
+cssnano-util-get-match@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/cssnano-util-get-match/-/cssnano-util-get-match-4.0.0.tgz#c0e4ca07f5386bb17ec5e52250b4f5961365156d"
+
+cssnano-util-raw-cache@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/cssnano-util-raw-cache/-/cssnano-util-raw-cache-4.0.0.tgz#be0a2856e25f185f5f7a2bcc0624e28b7f179a9f"
+  dependencies:
+    postcss "^6.0.0"
+
+cssnano-util-same-parent@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/cssnano-util-same-parent/-/cssnano-util-same-parent-4.0.0.tgz#d2a3de1039aa98bc4ec25001fa050330c2a16dac"
+
+cssnano@^3.4.0:
   version "3.10.0"
   resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-3.10.0.tgz#4f38f6cea2b9b17fa01490f23f1dc68ea65c1c38"
   dependencies:
@@ -1745,6 +1861,15 @@ cssnano@^3.10.0, cssnano@^3.4.0:
     postcss-value-parser "^3.2.3"
     postcss-zindex "^2.0.1"
 
+cssnano@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-4.0.0.tgz#e1a4161f17d82dff5fba17a90a7bfd97add79a1b"
+  dependencies:
+    cosmiconfig "^5.0.0"
+    cssnano-preset-default "^4.0.0"
+    is-resolvable "^1.0.0"
+    postcss "^6.0.0"
+
 csso@^3.5.0:
   version "3.5.0"
   resolved "https://registry.yarnpkg.com/csso/-/csso-3.5.0.tgz#acdbba5719e2c87bc801eadc032764b2e4b9d4e7"
@@ -2031,6 +2156,10 @@ electron-to-chromium@^1.2.7, electron-to-chromium@^1.3.42:
   version "1.3.44"
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.44.tgz#ef6b150a60d523082388cadad88085ecd2fd4684"
 
+electron-to-chromium@^1.3.30, electron-to-chromium@^1.3.50:
+  version "1.3.51"
+  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.51.tgz#6a42b49daaf7f22a5b37b991daf949f34dbdb9b5"
+
 elegant-spinner@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/elegant-spinner/-/elegant-spinner-1.0.1.tgz#db043521c95d7e303fd8f345bedc3349cfb0729e"
@@ -2898,6 +3027,12 @@ has-values@^1.0.0:
     is-number "^3.0.0"
     kind-of "^4.0.0"
 
+has@^1.0.0:
+  version "1.0.3"
+  resolved "https://registry.yarnpkg.com/has/-/has-1.0.3.tgz#722d7cbfc1f6aa8241f16dd814e011e1f41e8796"
+  dependencies:
+    function-bind "^1.1.1"
+
 has@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/has/-/has-1.0.1.tgz#8461733f538b0837c9361e39a9ab9e9704dc2f28"
@@ -2944,6 +3079,10 @@ he@1.1.1, he@^1.1.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/he/-/he-1.1.1.tgz#93410fd21b009735151f8868c2f271f3427e23fd"
 
+hex-color-regex@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/hex-color-regex/-/hex-color-regex-1.1.0.tgz#4c06fccb4602fe2602b3c93df82d7e7dbf1a8a8e"
+
 hmac-drbg@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/hmac-drbg/-/hmac-drbg-1.0.1.tgz#d2745701025a6c775a6c545793ed502fc0c649a1"
@@ -2971,6 +3110,14 @@ hosted-git-info@^2.1.4:
   version "2.6.0"
   resolved "https://registry.yarnpkg.com/hosted-git-info/-/hosted-git-info-2.6.0.tgz#23235b29ab230c576aab0d4f13fc046b0b038222"
 
+hsl-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/hsl-regex/-/hsl-regex-1.0.0.tgz#d49330c789ed819e276a4c0d272dffa30b18fe6e"
+
+hsla-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/hsla-regex/-/hsla-regex-1.0.0.tgz#c1ce7a3168c8c6614033a4b5f7877f3b225f9c38"
+
 html-comment-regex@^1.1.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/html-comment-regex/-/html-comment-regex-1.1.1.tgz#668b93776eaae55ebde8f3ad464b307a4963625e"
@@ -3166,6 +3313,10 @@ is-arrayish@^0.2.1:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.2.1.tgz#77c99840527aa8ecb1a8ba697b80645a7a926a9d"
 
+is-arrayish@^0.3.1:
+  version "0.3.2"
+  resolved "https://registry.yarnpkg.com/is-arrayish/-/is-arrayish-0.3.2.tgz#4574a2ae56f7ab206896fb431eaeed066fdf8f03"
+
 is-binary-path@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-binary-path/-/is-binary-path-1.0.1.tgz#75f16642b480f187a711c814161fd3a4a7655898"
@@ -3192,6 +3343,17 @@ is-ci@^1.0.10:
   dependencies:
     ci-info "^1.0.0"
 
+is-color-stop@^1.0.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-color-stop/-/is-color-stop-1.1.0.tgz#cfff471aee4dd5c9e158598fbe12967b5cdad345"
+  dependencies:
+    css-color-names "^0.0.4"
+    hex-color-regex "^1.1.0"
+    hsl-regex "^1.0.0"
+    hsla-regex "^1.0.0"
+    rgb-regex "^1.0.1"
+    rgba-regex "^1.0.0"
+
 is-data-descriptor@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/is-data-descriptor/-/is-data-descriptor-0.1.4.tgz#0b5ee648388e2c860282e793f1856fec3f301b56"
@@ -3413,6 +3575,12 @@ is-svg@^2.0.0:
   dependencies:
     html-comment-regex "^1.1.0"
 
+is-svg@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/is-svg/-/is-svg-3.0.0.tgz#9321dbd29c212e5ca99c4fa9794c714bcafa2f75"
+  dependencies:
+    html-comment-regex "^1.1.0"
+
 is-symbol@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-symbol/-/is-symbol-1.0.1.tgz#3cc59f00025194b6ab2e38dbae6689256b660572"
@@ -4577,6 +4745,12 @@ node-pre-gyp@^0.9.0:
     semver "^5.3.0"
     tar "^4"
 
+node-releases@^1.0.0-alpha.10:
+  version "1.0.0-alpha.10"
+  resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.0.0-alpha.10.tgz#61c8d5f9b5b2e05d84eba941d05b6f5202f68a2a"
+  dependencies:
+    semver "^5.3.0"
+
 node-sass@^4.7.2:
   version "4.9.0"
   resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-4.9.0.tgz#d1b8aa855d98ed684d6848db929a20771cc2ae52"
@@ -4646,6 +4820,10 @@ normalize-url@^1.4.0:
     query-string "^4.1.0"
     sort-keys "^1.0.0"
 
+normalize-url@^3.0.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/normalize-url/-/normalize-url-3.1.0.tgz#c3cbb2b09fbf1485e92935d603d9ee7156c61937"
+
 npm-bundled@^1.0.1:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/npm-bundled/-/npm-bundled-1.0.3.tgz#7e71703d973af3370a9591bafe3a63aca0be2308"
@@ -5089,6 +5267,15 @@ postcss-calc@^5.2.0:
     postcss-message-helpers "^2.0.0"
     reduce-css-calc "^1.2.6"
 
+postcss-calc@^6.0.0:
+  version "6.0.1"
+  resolved "https://registry.yarnpkg.com/postcss-calc/-/postcss-calc-6.0.1.tgz#3d24171bbf6e7629d422a436ebfe6dd9511f4330"
+  dependencies:
+    css-unit-converter "^1.1.1"
+    postcss "^6.0.0"
+    postcss-selector-parser "^2.2.2"
+    reduce-css-calc "^2.0.0"
+
 postcss-colormin@^2.1.8:
   version "2.2.2"
   resolved "https://registry.yarnpkg.com/postcss-colormin/-/postcss-colormin-2.2.2.tgz#6631417d5f0e909a3d7ec26b24c8a8d1e4f96e4b"
@@ -5097,6 +5284,16 @@ postcss-colormin@^2.1.8:
     postcss "^5.0.13"
     postcss-value-parser "^3.2.3"
 
+postcss-colormin@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-colormin/-/postcss-colormin-4.0.0.tgz#8a21f10b3843590d181eedf2a6a109617b6553ec"
+  dependencies:
+    browserslist "^4.0.0"
+    color "^3.0.0"
+    has "^1.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
 postcss-convert-values@^2.3.4:
   version "2.6.1"
   resolved "https://registry.yarnpkg.com/postcss-convert-values/-/postcss-convert-values-2.6.1.tgz#bbd8593c5c1fd2e3d1c322bb925dcae8dae4d62d"
@@ -5104,30 +5301,61 @@ postcss-convert-values@^2.3.4:
     postcss "^5.0.11"
     postcss-value-parser "^3.1.2"
 
+postcss-convert-values@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-convert-values/-/postcss-convert-values-4.0.0.tgz#77d77d9aed1dc4e6956e651cc349d53305876f62"
+  dependencies:
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
 postcss-discard-comments@^2.0.4:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/postcss-discard-comments/-/postcss-discard-comments-2.0.4.tgz#befe89fafd5b3dace5ccce51b76b81514be00e3d"
   dependencies:
     postcss "^5.0.14"
 
+postcss-discard-comments@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-discard-comments/-/postcss-discard-comments-4.0.0.tgz#9684a299e76b3e93263ef8fd2adbf1a1c08fd88d"
+  dependencies:
+    postcss "^6.0.0"
+
 postcss-discard-duplicates@^2.0.1:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/postcss-discard-duplicates/-/postcss-discard-duplicates-2.1.0.tgz#b9abf27b88ac188158a5eb12abcae20263b91932"
   dependencies:
     postcss "^5.0.4"
 
+postcss-discard-duplicates@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-discard-duplicates/-/postcss-discard-duplicates-4.0.0.tgz#42f3c267f85fa909e042c35767ecfd65cb2bd72c"
+  dependencies:
+    postcss "^6.0.0"
+
 postcss-discard-empty@^2.0.1:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/postcss-discard-empty/-/postcss-discard-empty-2.1.0.tgz#d2b4bd9d5ced5ebd8dcade7640c7d7cd7f4f92b5"
   dependencies:
     postcss "^5.0.14"
 
+postcss-discard-empty@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-discard-empty/-/postcss-discard-empty-4.0.0.tgz#55e18a59c74128e38c7d2804bcfa4056611fb97f"
+  dependencies:
+    postcss "^6.0.0"
+
 postcss-discard-overridden@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/postcss-discard-overridden/-/postcss-discard-overridden-0.1.1.tgz#8b1eaf554f686fb288cd874c55667b0aa3668d58"
   dependencies:
     postcss "^5.0.16"
 
+postcss-discard-overridden@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-discard-overridden/-/postcss-discard-overridden-4.0.0.tgz#4a0bf85978784cf1f81ed2c1c1fd9d964a1da1fa"
+  dependencies:
+    postcss "^6.0.0"
+
 postcss-discard-unused@^2.2.1:
   version "2.2.3"
   resolved "https://registry.yarnpkg.com/postcss-discard-unused/-/postcss-discard-unused-2.2.3.tgz#bce30b2cc591ffc634322b5fb3464b6d934f4433"
@@ -5156,6 +5384,14 @@ postcss-merge-longhand@^2.0.1:
   dependencies:
     postcss "^5.0.4"
 
+postcss-merge-longhand@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-merge-longhand/-/postcss-merge-longhand-4.0.0.tgz#a4541b668a0a6ac25aa21d930142fd02b41a717c"
+  dependencies:
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+    stylehacks "^4.0.0"
+
 postcss-merge-rules@^2.0.3:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/postcss-merge-rules/-/postcss-merge-rules-2.1.2.tgz#d1df5dfaa7b1acc3be553f0e9e10e87c61b5f721"
@@ -5166,6 +5402,17 @@ postcss-merge-rules@^2.0.3:
     postcss-selector-parser "^2.2.2"
     vendors "^1.0.0"
 
+postcss-merge-rules@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-merge-rules/-/postcss-merge-rules-4.0.0.tgz#ab467832cbff4b22cf9350fed92536677ead4ecf"
+  dependencies:
+    browserslist "^4.0.0"
+    caniuse-api "^2.0.0"
+    cssnano-util-same-parent "^4.0.0"
+    postcss "^6.0.0"
+    postcss-selector-parser "^3.0.0"
+    vendors "^1.0.0"
+
 postcss-message-helpers@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/postcss-message-helpers/-/postcss-message-helpers-2.0.0.tgz#a4f2f4fab6e4fe002f0aed000478cdf52f9ba60e"
@@ -5178,6 +5425,13 @@ postcss-minify-font-values@^1.0.2:
     postcss "^5.0.4"
     postcss-value-parser "^3.0.2"
 
+postcss-minify-font-values@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-minify-font-values/-/postcss-minify-font-values-4.0.0.tgz#4cc33d283d6a81759036e757ef981d92cbd85bed"
+  dependencies:
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
 postcss-minify-gradients@^1.0.1:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/postcss-minify-gradients/-/postcss-minify-gradients-1.0.5.tgz#5dbda11373703f83cfb4a3ea3881d8d75ff5e6e1"
@@ -5185,6 +5439,15 @@ postcss-minify-gradients@^1.0.1:
     postcss "^5.0.12"
     postcss-value-parser "^3.3.0"
 
+postcss-minify-gradients@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-minify-gradients/-/postcss-minify-gradients-4.0.0.tgz#3fc3916439d27a9bb8066db7cdad801650eb090e"
+  dependencies:
+    cssnano-util-get-arguments "^4.0.0"
+    is-color-stop "^1.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
 postcss-minify-params@^1.0.4:
   version "1.2.2"
   resolved "https://registry.yarnpkg.com/postcss-minify-params/-/postcss-minify-params-1.2.2.tgz#ad2ce071373b943b3d930a3fa59a358c28d6f1f3"
@@ -5194,6 +5457,16 @@ postcss-minify-params@^1.0.4:
     postcss-value-parser "^3.0.2"
     uniqs "^2.0.0"
 
+postcss-minify-params@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-minify-params/-/postcss-minify-params-4.0.0.tgz#05e9166ee48c05af651989ce84d39c1b4d790674"
+  dependencies:
+    alphanum-sort "^1.0.0"
+    cssnano-util-get-arguments "^4.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+    uniqs "^2.0.0"
+
 postcss-minify-selectors@^2.0.4:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/postcss-minify-selectors/-/postcss-minify-selectors-2.1.1.tgz#b2c6a98c0072cf91b932d1a496508114311735bf"
@@ -5203,6 +5476,15 @@ postcss-minify-selectors@^2.0.4:
     postcss "^5.0.14"
     postcss-selector-parser "^2.0.0"
 
+postcss-minify-selectors@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-minify-selectors/-/postcss-minify-selectors-4.0.0.tgz#b1e9f6c463416d3fcdcb26e7b785d95f61578aad"
+  dependencies:
+    alphanum-sort "^1.0.0"
+    has "^1.0.0"
+    postcss "^6.0.0"
+    postcss-selector-parser "^3.0.0"
+
 postcss-modules-extract-imports@1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/postcss-modules-extract-imports/-/postcss-modules-extract-imports-1.1.0.tgz#b614c9720be6816eaee35fb3a5faa1dba6a05ddb"
@@ -5245,6 +5527,61 @@ postcss-normalize-charset@^1.1.0:
   dependencies:
     postcss "^5.0.5"
 
+postcss-normalize-charset@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-charset/-/postcss-normalize-charset-4.0.0.tgz#24527292702d5e8129eafa3d1de49ed51a6ab730"
+  dependencies:
+    postcss "^6.0.0"
+
+postcss-normalize-display-values@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-display-values/-/postcss-normalize-display-values-4.0.0.tgz#950e0c7be3445770a160fffd6b6644c3c0cd8f89"
+  dependencies:
+    cssnano-util-get-match "^4.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-positions@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-positions/-/postcss-normalize-positions-4.0.0.tgz#ee9343ab981b822c63ab72615ecccd08564445a3"
+  dependencies:
+    cssnano-util-get-arguments "^4.0.0"
+    has "^1.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-repeat-style@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-repeat-style/-/postcss-normalize-repeat-style-4.0.0.tgz#b711c592cf16faf9ff575e42fa100b6799083eff"
+  dependencies:
+    cssnano-util-get-arguments "^4.0.0"
+    cssnano-util-get-match "^4.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-string@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-string/-/postcss-normalize-string-4.0.0.tgz#718cb6d30a6fac6ac6a830e32c06c07dbc66fe5d"
+  dependencies:
+    has "^1.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-timing-functions@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-timing-functions/-/postcss-normalize-timing-functions-4.0.0.tgz#0351f29886aa981d43d91b2c2bd1aea6d0af6d23"
+  dependencies:
+    cssnano-util-get-match "^4.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-unicode@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-unicode/-/postcss-normalize-unicode-4.0.0.tgz#5acd5d47baea5d17674b2ccc4ae5166fa88cdf97"
+  dependencies:
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
 postcss-normalize-url@^3.0.7:
   version "3.0.8"
   resolved "https://registry.yarnpkg.com/postcss-normalize-url/-/postcss-normalize-url-3.0.8.tgz#108f74b3f2fcdaf891a2ffa3ea4592279fc78222"
@@ -5254,6 +5591,22 @@ postcss-normalize-url@^3.0.7:
     postcss "^5.0.14"
     postcss-value-parser "^3.2.3"
 
+postcss-normalize-url@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-url/-/postcss-normalize-url-4.0.0.tgz#b7a9c8ad26cf26694c146eb2d68bd0cf49956f0d"
+  dependencies:
+    is-absolute-url "^2.0.0"
+    normalize-url "^3.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
+postcss-normalize-whitespace@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-normalize-whitespace/-/postcss-normalize-whitespace-4.0.0.tgz#1da7e76b10ae63c11827fa04fc3bb4a1efe99cc0"
+  dependencies:
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
 postcss-ordered-values@^2.1.0:
   version "2.2.3"
   resolved "https://registry.yarnpkg.com/postcss-ordered-values/-/postcss-ordered-values-2.2.3.tgz#eec6c2a67b6c412a8db2042e77fe8da43f95c11d"
@@ -5261,6 +5614,14 @@ postcss-ordered-values@^2.1.0:
     postcss "^5.0.4"
     postcss-value-parser "^3.0.1"
 
+postcss-ordered-values@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-ordered-values/-/postcss-ordered-values-4.0.0.tgz#58b40c74f72e022eb34152c12e4b0f9354482fc2"
+  dependencies:
+    cssnano-util-get-arguments "^4.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
 postcss-reduce-idents@^2.2.2:
   version "2.4.0"
   resolved "https://registry.yarnpkg.com/postcss-reduce-idents/-/postcss-reduce-idents-2.4.0.tgz#c2c6d20cc958284f6abfbe63f7609bf409059ad3"
@@ -5274,6 +5635,15 @@ postcss-reduce-initial@^1.0.0:
   dependencies:
     postcss "^5.0.4"
 
+postcss-reduce-initial@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-reduce-initial/-/postcss-reduce-initial-4.0.0.tgz#0afbdb0e7399960a9d06cb45b469d8121108b45b"
+  dependencies:
+    browserslist "^4.0.0"
+    caniuse-api "^2.0.0"
+    has "^1.0.0"
+    postcss "^6.0.0"
+
 postcss-reduce-transforms@^1.0.3:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/postcss-reduce-transforms/-/postcss-reduce-transforms-1.0.4.tgz#ff76f4d8212437b31c298a42d2e1444025771ae1"
@@ -5282,6 +5652,15 @@ postcss-reduce-transforms@^1.0.3:
     postcss "^5.0.8"
     postcss-value-parser "^3.0.1"
 
+postcss-reduce-transforms@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-reduce-transforms/-/postcss-reduce-transforms-4.0.0.tgz#f645fc7440c35274f40de8104e14ad7163edf188"
+  dependencies:
+    cssnano-util-get-match "^4.0.0"
+    has "^1.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+
 postcss-selector-parser@^2.0.0, postcss-selector-parser@^2.2.2:
   version "2.2.3"
   resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-2.2.3.tgz#f9437788606c3c9acee16ffe8d8b16297f27bb90"
@@ -5290,7 +5669,7 @@ postcss-selector-parser@^2.0.0, postcss-selector-parser@^2.2.2:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
-postcss-selector-parser@^3.1.1:
+postcss-selector-parser@^3.0.0, postcss-selector-parser@^3.1.1:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-3.1.1.tgz#4f875f4afb0c96573d5cf4d74011aee250a7e865"
   dependencies:
@@ -5307,6 +5686,15 @@ postcss-svgo@^2.1.1:
     postcss-value-parser "^3.2.3"
     svgo "^0.7.0"
 
+postcss-svgo@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-svgo/-/postcss-svgo-4.0.0.tgz#c0bbad02520fc636c9d78b0e8403e2e515c32285"
+  dependencies:
+    is-svg "^3.0.0"
+    postcss "^6.0.0"
+    postcss-value-parser "^3.0.0"
+    svgo "^1.0.0"
+
 postcss-unique-selectors@^2.0.2:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/postcss-unique-selectors/-/postcss-unique-selectors-2.0.2.tgz#981d57d29ddcb33e7b1dfe1fd43b8649f933ca1d"
@@ -5315,7 +5703,15 @@ postcss-unique-selectors@^2.0.2:
     postcss "^5.0.4"
     uniqs "^2.0.0"
 
-postcss-value-parser@^3.0.1, postcss-value-parser@^3.0.2, postcss-value-parser@^3.1.1, postcss-value-parser@^3.1.2, postcss-value-parser@^3.2.3, postcss-value-parser@^3.3.0:
+postcss-unique-selectors@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/postcss-unique-selectors/-/postcss-unique-selectors-4.0.0.tgz#04c1e9764c75874261303402c41f0e9769fc5501"
+  dependencies:
+    alphanum-sort "^1.0.0"
+    postcss "^6.0.0"
+    uniqs "^2.0.0"
+
+postcss-value-parser@^3.0.0, postcss-value-parser@^3.0.1, postcss-value-parser@^3.0.2, postcss-value-parser@^3.1.1, postcss-value-parser@^3.1.2, postcss-value-parser@^3.2.3, postcss-value-parser@^3.3.0:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-3.3.0.tgz#87f38f9f18f774a4ab4c8a232f5c5ce8872a9d15"
 
@@ -5344,6 +5740,14 @@ postcss@^5.0.10, postcss@^5.0.11, postcss@^5.0.12, postcss@^5.0.13, postcss@^5.0
     source-map "^0.5.6"
     supports-color "^3.2.3"
 
+postcss@^6.0.0:
+  version "6.0.23"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.23.tgz#61c82cc328ac60e677645f979054eb98bc0e3324"
+  dependencies:
+    chalk "^2.4.1"
+    source-map "^0.6.1"
+    supports-color "^5.4.0"
+
 postcss@^6.0.1, postcss@^6.0.19, postcss@^6.0.20:
   version "6.0.22"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.22.tgz#e23b78314905c3b90cbd61702121e7a78848f2a3"
@@ -5691,6 +6095,13 @@ reduce-css-calc@^1.2.6:
     math-expression-evaluator "^1.2.14"
     reduce-function-call "^1.0.1"
 
+reduce-css-calc@^2.0.0:
+  version "2.1.4"
+  resolved "https://registry.yarnpkg.com/reduce-css-calc/-/reduce-css-calc-2.1.4.tgz#c20e9cda8445ad73d4ff4bea960c6f8353791708"
+  dependencies:
+    css-unit-converter "^1.1.1"
+    postcss-value-parser "^3.3.0"
+
 reduce-function-call@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/reduce-function-call/-/reduce-function-call-1.0.2.tgz#5a200bf92e0e37751752fe45b0ab330fd4b6be99"
@@ -5903,6 +6314,14 @@ ret@~0.1.10:
   version "0.1.15"
   resolved "https://registry.yarnpkg.com/ret/-/ret-0.1.15.tgz#b8a4825d5bdb1fc3f6f53c2bc33f81388681c7bc"
 
+rgb-regex@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/rgb-regex/-/rgb-regex-1.0.1.tgz#c0e0d6882df0e23be254a475e8edd41915feaeb1"
+
+rgba-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/rgba-regex/-/rgba-regex-1.0.0.tgz#43374e2e2ca0968b0ef1523460b7d730ff22eeb3"
+
 right-align@^0.1.1:
   version "0.1.3"
   resolved "https://registry.yarnpkg.com/right-align/-/right-align-0.1.3.tgz#61339b722fe6a3515689210d24e14c96148613ef"
@@ -6101,6 +6520,12 @@ signal-exit@^3.0.0, signal-exit@^3.0.1, signal-exit@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
 
+simple-swizzle@^0.2.2:
+  version "0.2.2"
+  resolved "https://registry.yarnpkg.com/simple-swizzle/-/simple-swizzle-0.2.2.tgz#a4da6b635ffcccca33f70d17cb92592de95e557a"
+  dependencies:
+    is-arrayish "^0.3.1"
+
 sinon@^5.0.1:
   version "5.0.7"
   resolved "https://registry.yarnpkg.com/sinon/-/sinon-5.0.7.tgz#3bded6a73613ccc9e512e20246ced69a27c27dab"
@@ -6453,6 +6878,14 @@ strip-json-comments@~2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/strip-json-comments/-/strip-json-comments-2.0.1.tgz#3c531942e908c2697c0ec344858c286c7ca0a60a"
 
+stylehacks@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/stylehacks/-/stylehacks-4.0.0.tgz#64b323951c4a24e5fc7b2ec06c137bf32d155e8a"
+  dependencies:
+    browserslist "^4.0.0"
+    postcss "^6.0.0"
+    postcss-selector-parser "^3.0.0"
+
 stylus@0.54.5, stylus@^0.54.5:
   version "0.54.5"
   resolved "https://registry.yarnpkg.com/stylus/-/stylus-0.54.5.tgz#42b9560931ca7090ce8515a798ba9e6aa3d6dc79"
@@ -6498,7 +6931,7 @@ svgo@^0.7.0:
     sax "~1.2.1"
     whet.extend "~0.9.9"
 
-svgo@^1.0.5:
+svgo@^1.0.0, svgo@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/svgo/-/svgo-1.0.5.tgz#7040364c062a0538abacff4401cea6a26a7a389a"
   dependencies:
@@ -6605,6 +7038,10 @@ timers-browserify@^2.0.4:
   dependencies:
     setimmediate "^1.0.4"
 
+timsort@^0.3.0:
+  version "0.3.0"
+  resolved "https://registry.yarnpkg.com/timsort/-/timsort-0.3.0.tgz#405411a8e7e6339fe64db9a234de11dc31e02bd4"
+
 tiny-inflate@^1.0.0:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/tiny-inflate/-/tiny-inflate-1.0.2.tgz#93d9decffc8805bd57eae4310f0b745e9b6fb3a7"