diff --git a/packages/kbn-plugin-helpers/package.json b/packages/kbn-plugin-helpers/package.json
index 70198c6b4da84..a460c5b922f2b 100644
--- a/packages/kbn-plugin-helpers/package.json
+++ b/packages/kbn-plugin-helpers/package.json
@@ -13,6 +13,7 @@
     "argv-split": "^2.0.1",
     "commander": "^2.9.0",
     "del": "^2.2.2",
+    "execa": "^0.10.0",
     "gulp-rename": "1.2.2",
     "gulp-zip": "^4.1.0",
     "inquirer": "^1.2.2",
diff --git a/packages/kbn-plugin-helpers/tasks/build/create_build.js b/packages/kbn-plugin-helpers/tasks/build/create_build.js
index 6c44aa183a6d2..8a7a590233ee6 100644
--- a/packages/kbn-plugin-helpers/tasks/build/create_build.js
+++ b/packages/kbn-plugin-helpers/tasks/build/create_build.js
@@ -20,7 +20,7 @@
 const path = require('path');
 const relative = require('path').relative;
 const { readFileSync, writeFileSync, unlinkSync, existsSync } = require('fs');
-const execFileSync = require('child_process').execFileSync;
+const execa = require('execa');
 const sass = require('node-sass');
 const del = require('del');
 const vfs = require('vinyl-fs');
@@ -112,15 +112,12 @@ module.exports = function createBuild(
       }
 
       // install packages in build
-      const options = {
-        cwd: buildRoot,
-        stdio: ['ignore', 'ignore', 'pipe'],
-      };
-
-      execFileSync(
+      execa.sync(
         winCmd('yarn'),
         ['install', '--production', '--pure-lockfile'],
-        options
+        {
+          cwd: buildRoot,
+        }
       );
     })
     .then(function() {
@@ -172,13 +169,10 @@ module.exports = function createBuild(
         writeFileSync(buildConfigPath, JSON.stringify(buildConfig));
       }
 
-      execFileSync(
+      execa.sync(
         path.join(buildSource, 'node_modules', '.bin', winCmd('tsc')),
         ['--pretty', 'true'],
-        {
-          cwd: buildRoot,
-          stdio: ['ignore', 'pipe', 'pipe'],
-        }
+        { cwd: buildRoot }
       );
 
       del.sync([
diff --git a/packages/kbn-plugin-helpers/yarn.lock b/packages/kbn-plugin-helpers/yarn.lock
index 7ab171e5e8aad..d5e6b213bbd37 100644
--- a/packages/kbn-plugin-helpers/yarn.lock
+++ b/packages/kbn-plugin-helpers/yarn.lock
@@ -296,6 +296,16 @@ cross-spawn@^3.0.0:
     lru-cache "^4.0.1"
     which "^1.2.9"
 
+cross-spawn@^6.0.0:
+  version "6.0.5"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-6.0.5.tgz#4a5ec7c64dfae22c3a14124dbacdee846d80cbc4"
+  dependencies:
+    nice-try "^1.0.4"
+    path-key "^2.0.1"
+    semver "^5.5.0"
+    shebang-command "^1.2.0"
+    which "^1.2.9"
+
 cryptiles@2.x.x:
   version "2.0.5"
   resolved "https://registry.yarnpkg.com/cryptiles/-/cryptiles-2.0.5.tgz#3bdfecdc608147c1c67202fa291e7dca59eaa3b8"
@@ -376,6 +386,18 @@ escape-string-regexp@^1.0.2, escape-string-regexp@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
 
+execa@^0.10.0:
+  version "0.10.0"
+  resolved "https://registry.yarnpkg.com/execa/-/execa-0.10.0.tgz#ff456a8f53f90f8eccc71a96d11bdfc7f082cb50"
+  dependencies:
+    cross-spawn "^6.0.0"
+    get-stream "^3.0.0"
+    is-stream "^1.1.0"
+    npm-run-path "^2.0.0"
+    p-finally "^1.0.0"
+    signal-exit "^3.0.0"
+    strip-eof "^1.0.0"
+
 exit-hook@^1.0.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/exit-hook/-/exit-hook-1.1.1.tgz#f05ca233b48c05d54fff07765df8507e95c02ff8"
@@ -792,6 +814,10 @@ is-relative@^1.0.0:
   dependencies:
     is-unc-path "^1.0.0"
 
+is-stream@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-stream/-/is-stream-1.1.0.tgz#12d4a3dd4e68e0b79ceb8dbc84173ae80d91ca44"
+
 is-typedarray@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-typedarray/-/is-typedarray-1.0.0.tgz#e479c80858df0c1b11ddda6940f96011fcda4a9a"
@@ -988,6 +1014,10 @@ nan@^2.10.0:
   version "2.10.0"
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.10.0.tgz#96d0cd610ebd58d4b4de9cc0c6828cda99c7548f"
 
+nice-try@^1.0.4:
+  version "1.0.4"
+  resolved "https://registry.yarnpkg.com/nice-try/-/nice-try-1.0.4.tgz#d93962f6c52f2c1558c0fbda6d512819f1efe1c4"
+
 node-gyp@^3.3.1:
   version "3.7.0"
   resolved "https://registry.yarnpkg.com/node-gyp/-/node-gyp-3.7.0.tgz#789478e8f6c45e277aa014f3e28f958f286f9203"
@@ -1056,6 +1086,12 @@ now-and-later@^2.0.0:
   dependencies:
     once "^1.3.2"
 
+npm-run-path@^2.0.0:
+  version "2.0.2"
+  resolved "https://registry.yarnpkg.com/npm-run-path/-/npm-run-path-2.0.2.tgz#35a9232dfa35d7067b4cb2ddf2357b1871536c5f"
+  dependencies:
+    path-key "^2.0.0"
+
 "npmlog@0 || 1 || 2 || 3 || 4", npmlog@^4.0.0:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/npmlog/-/npmlog-4.1.2.tgz#08a7f2a8bf734604779a9efa4ad5cc717abb954b"
@@ -1131,6 +1167,10 @@ osenv@0:
     os-homedir "^1.0.0"
     os-tmpdir "^1.0.0"
 
+p-finally@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/p-finally/-/p-finally-1.0.0.tgz#3fbcfb15b899a44123b34b6dcc18b724336a2cae"
+
 parse-json@^2.2.0:
   version "2.2.0"
   resolved "https://registry.yarnpkg.com/parse-json/-/parse-json-2.2.0.tgz#f480f40434ef80741f8469099f8dea18f55a4dc9"
@@ -1155,6 +1195,10 @@ path-is-inside@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/path-is-inside/-/path-is-inside-1.0.2.tgz#365417dede44430d1c11af61027facf074bdfc53"
 
+path-key@^2.0.0, path-key@^2.0.1:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/path-key/-/path-key-2.0.1.tgz#411cadb574c5a140d3a4b1910d40d80cc9f40b40"
+
 path-type@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/path-type/-/path-type-1.1.0.tgz#59c44f7ee491da704da415da5a4070ba4f8fe441"
@@ -1434,7 +1478,7 @@ scss-tokenizer@^0.2.3:
     js-base64 "^2.1.8"
     source-map "^0.4.2"
 
-"semver@2 || 3 || 4 || 5":
+"semver@2 || 3 || 4 || 5", semver@^5.5.0:
   version "5.5.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"
 
@@ -1446,6 +1490,16 @@ set-blocking@^2.0.0, set-blocking@~2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/set-blocking/-/set-blocking-2.0.0.tgz#045f9782d011ae9a6803ddd382b24392b3d890f7"
 
+shebang-command@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/shebang-command/-/shebang-command-1.2.0.tgz#44aac65b695b03398968c39f363fee5deafdf1ea"
+  dependencies:
+    shebang-regex "^1.0.0"
+
+shebang-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-1.0.0.tgz#da42f49740c0b42db2ca9728571cb190c98efea3"
+
 signal-exit@^3.0.0:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
@@ -1565,6 +1619,10 @@ strip-bom@^2.0.0:
   dependencies:
     is-utf8 "^0.2.0"
 
+strip-eof@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/strip-eof/-/strip-eof-1.0.0.tgz#bb43ff5598a6eb05d89b59fcd129c983313606bf"
+
 strip-indent@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/strip-indent/-/strip-indent-1.0.1.tgz#0c7962a6adefa7bbd4ac366460a638552ae1a0a2"
diff --git a/x-pack/yarn.lock b/x-pack/yarn.lock
index 27b556f47021b..6afacc9f42e39 100644
--- a/x-pack/yarn.lock
+++ b/x-pack/yarn.lock
@@ -517,6 +517,10 @@ astral-regex@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/astral-regex/-/astral-regex-1.0.0.tgz#6c8c3fb827dd43ee3918f27b82782ab7658a6fd9"
 
+async-foreach@^0.1.3:
+  version "0.1.3"
+  resolved "https://registry.yarnpkg.com/async-foreach/-/async-foreach-0.1.3.tgz#36121f845c0578172de419a97dbeb1d16ec34542"
+
 async-limiter@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/async-limiter/-/async-limiter-1.0.0.tgz#78faed8c3d074ab81f22b4e985d79e8738f720f8"
@@ -1273,6 +1277,10 @@ camelcase@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/camelcase/-/camelcase-4.1.0.tgz#d545635be1e33c542649c69173e5de6acfae34dd"
 
+caseless@~0.11.0:
+  version "0.11.0"
+  resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.11.0.tgz#715b96ea9841593cc33067923f5ec60ebda4f7d7"
+
 caseless@~0.12.0:
   version "0.12.0"
   resolved "https://registry.yarnpkg.com/caseless/-/caseless-0.12.0.tgz#1b681c21ff84033c826543090689420d187151dc"
@@ -1305,7 +1313,7 @@ chai@~1.9.2:
     assertion-error "1.0.0"
     deep-eql "0.1.3"
 
-chalk@^1.0.0, chalk@^1.1.3:
+chalk@^1.0.0, chalk@^1.1.1, chalk@^1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
   dependencies:
@@ -1612,6 +1620,13 @@ create-react-class@^15.5.2:
     loose-envify "^1.3.1"
     object-assign "^4.1.1"
 
+cross-spawn@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-3.0.1.tgz#1256037ecb9f0c5f79e3d6ef135e30770184b982"
+  dependencies:
+    lru-cache "^4.0.1"
+    which "^1.2.9"
+
 cross-spawn@^5.0.1:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-5.1.0.tgz#e8bd0efee58fcff6f8f94510a0a554bbfa235449"
@@ -2800,6 +2815,22 @@ gaze@^0.5.1:
   dependencies:
     globule "~0.1.0"
 
+gaze@^1.0.0:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/gaze/-/gaze-1.1.3.tgz#c441733e13b927ac8c0ff0b4c3b033f28812924a"
+  dependencies:
+    globule "^1.0.0"
+
+generate-function@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/generate-function/-/generate-function-2.0.0.tgz#6858fe7c0969b7d4e9093337647ac79f60dfbe74"
+
+generate-object-property@^1.1.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/generate-object-property/-/generate-object-property-1.2.0.tgz#9c0e1c40308ce804f4783618b937fa88f99d50d0"
+  dependencies:
+    is-property "^1.0.0"
+
 get-caller-file@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/get-caller-file/-/get-caller-file-1.0.2.tgz#f702e63127e7e231c160a80c1554acb70d5047e5"
@@ -2903,7 +2934,7 @@ glob@3.2.11:
     inherits "2"
     minimatch "0.3"
 
-glob@6.0.4:
+glob@6.0.4, glob@^6.0.4:
   version "6.0.4"
   resolved "https://registry.yarnpkg.com/glob/-/glob-6.0.4.tgz#0f08860f6a155127b2fadd4f9ce24b1aab6e4d22"
   dependencies:
@@ -2933,7 +2964,7 @@ glob@^4.3.1:
     minimatch "^2.0.1"
     once "^1.3.0"
 
-glob@^7.0.3, glob@^7.0.5, glob@^7.1.1, glob@^7.1.2:
+glob@^7.0.0, glob@^7.0.3, glob@^7.0.5, glob@^7.1.1, glob@^7.1.2, glob@~7.1.1:
   version "7.1.2"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.2.tgz#c19c9df9a028702d678612384a6552404c636d15"
   dependencies:
@@ -3011,6 +3042,14 @@ globby@^6.1.0:
     pify "^2.0.0"
     pinkie-promise "^2.0.0"
 
+globule@^1.0.0:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/globule/-/globule-1.2.1.tgz#5dffb1b191f22d20797a9369b49eab4e9839696d"
+  dependencies:
+    glob "~7.1.1"
+    lodash "~4.17.10"
+    minimatch "~3.0.2"
+
 globule@~0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/globule/-/globule-0.1.0.tgz#d9c8edde1da79d125a151b79533b978676346ae5"
@@ -3256,6 +3295,15 @@ har-schema@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/har-schema/-/har-schema-2.0.0.tgz#a94c2224ebcac04782a0d9035521f24735b7ec92"
 
+har-validator@~2.0.6:
+  version "2.0.6"
+  resolved "https://registry.yarnpkg.com/har-validator/-/har-validator-2.0.6.tgz#cdcbc08188265ad119b6a5a7c8ab70eecfb5d27d"
+  dependencies:
+    chalk "^1.1.1"
+    commander "^2.9.0"
+    is-my-json-valid "^2.12.4"
+    pinkie-promise "^2.0.0"
+
 har-validator@~4.2.1:
   version "4.2.1"
   resolved "https://registry.yarnpkg.com/har-validator/-/har-validator-4.2.1.tgz#33481d0f1bbff600dd203d75812a6a5fba002e2a"
@@ -3517,6 +3565,10 @@ imurmurhash@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/imurmurhash/-/imurmurhash-0.1.4.tgz#9218b9b2b928a238b13dc4fb6b6d576f231453ea"
 
+in-publish@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/in-publish/-/in-publish-2.0.0.tgz#e20ff5e3a2afc2690320b6dc552682a9c7fadf51"
+
 indent-string@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/indent-string/-/indent-string-2.1.0.tgz#8e2d48348742121b4a8218b7a137e9a52049dc80"
@@ -3733,6 +3785,20 @@ is-glob@^3.1.0:
   dependencies:
     is-extglob "^2.1.0"
 
+is-my-ip-valid@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/is-my-ip-valid/-/is-my-ip-valid-1.0.0.tgz#7b351b8e8edd4d3995d4d066680e664d94696824"
+
+is-my-json-valid@^2.12.4:
+  version "2.17.2"
+  resolved "https://registry.yarnpkg.com/is-my-json-valid/-/is-my-json-valid-2.17.2.tgz#6b2103a288e94ef3de5cf15d29dd85fc4b78d65c"
+  dependencies:
+    generate-function "^2.0.0"
+    generate-object-property "^1.1.0"
+    is-my-ip-valid "^1.0.0"
+    jsonpointer "^4.0.0"
+    xtend "^4.0.0"
+
 is-negated-glob@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-negated-glob/-/is-negated-glob-1.0.0.tgz#6910bca5da8c95e784b5751b976cf5a10fee36d2"
@@ -3797,6 +3863,10 @@ is-promise@^2.1.0:
   version "2.1.0"
   resolved "https://registry.yarnpkg.com/is-promise/-/is-promise-2.1.0.tgz#79a2a9ece7f096e80f36d2b2f3bc16c1ff4bf3fa"
 
+is-property@^1.0.0:
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/is-property/-/is-property-1.0.2.tgz#57fe1c4e48474edd65b09911f26b1cd4095dda84"
+
 is-regex@^1.0.4:
   version "1.0.4"
   resolved "https://registry.yarnpkg.com/is-regex/-/is-regex-1.0.4.tgz#5517489b547091b0930e095654ced25ee97e9491"
@@ -4283,6 +4353,10 @@ jquery@^3.3.1:
   version "3.3.1"
   resolved "https://registry.yarnpkg.com/jquery/-/jquery-3.3.1.tgz#958ce29e81c9790f31be7792df5d4d95fc57fbca"
 
+js-base64@^2.1.8:
+  version "2.4.5"
+  resolved "https://registry.yarnpkg.com/js-base64/-/js-base64-2.4.5.tgz#e293cd3c7c82f070d700fc7a1ca0a2e69f101f92"
+
 js-tokens@^3.0.0, js-tokens@^3.0.2:
   version "3.0.2"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-3.0.2.tgz#9866df395102130e38f7f996bceb65443209c25b"
@@ -4369,6 +4443,10 @@ jsonify@~0.0.0:
   version "0.0.0"
   resolved "https://registry.yarnpkg.com/jsonify/-/jsonify-0.0.0.tgz#2c74b6ee41d93ca51b7b5aaee8f503631d252a73"
 
+jsonpointer@^4.0.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/jsonpointer/-/jsonpointer-4.0.1.tgz#4fd92cb34e0e9db3c89c8622ecf51f9b978c6cb9"
+
 jsprim@^1.2.2:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/jsprim/-/jsprim-1.4.1.tgz#313e66bc1e5cc06e438bc1b7499c2e5c56acb6a2"
@@ -4593,10 +4671,14 @@ lodash._root@^3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/lodash._root/-/lodash._root-3.0.1.tgz#fba1c4524c19ee9a5f8136b4609f017cf4ded692"
 
-lodash.assign@^4.0.3, lodash.assign@^4.0.6:
+lodash.assign@^4.0.3, lodash.assign@^4.0.6, lodash.assign@^4.2.0:
   version "4.2.0"
   resolved "https://registry.yarnpkg.com/lodash.assign/-/lodash.assign-4.2.0.tgz#0d99f3ccd7a6d261d19bdaeb9245005d285808e7"
 
+lodash.clonedeep@^4.3.2:
+  version "4.5.0"
+  resolved "https://registry.yarnpkg.com/lodash.clonedeep/-/lodash.clonedeep-4.5.0.tgz#e23f3f9c4f8fbdde872529c1071857a086e5ccef"
+
 lodash.create@3.1.1:
   version "3.1.1"
   resolved "https://registry.yarnpkg.com/lodash.create/-/lodash.create-3.1.1.tgz#d7f2849f0dbda7e04682bb8cd72ab022461debe7"
@@ -4665,6 +4747,10 @@ lodash.mean@^4.1.0:
   version "4.1.0"
   resolved "https://registry.yarnpkg.com/lodash.mean/-/lodash.mean-4.1.0.tgz#bb985349628c0b9d7fe0f5fcc0011a2ee2c0dd7a"
 
+lodash.mergewith@^4.6.0:
+  version "4.6.1"
+  resolved "https://registry.yarnpkg.com/lodash.mergewith/-/lodash.mergewith-4.6.1.tgz#639057e726c3afbdb3e7d42741caa8d6e4335927"
+
 lodash.orderby@4.6.0:
   version "4.6.0"
   resolved "https://registry.yarnpkg.com/lodash.orderby/-/lodash.orderby-4.6.0.tgz#e697f04ce5d78522f54d9338b32b81a3393e4eb3"
@@ -4740,6 +4826,10 @@ lodash@3.10.1, lodash@^3.10.0, lodash@^3.10.1:
   version "3.10.1"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"
 
+lodash@^4.0.0, lodash@~4.17.10:
+  version "4.17.10"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.10.tgz#1b7793cf7259ea38fb3661d4d38b3260af8ae4e7"
+
 lodash@^4.0.1, lodash@^4.13.1, lodash@^4.14.0, lodash@^4.15.0, lodash@^4.17.4, lodash@^4.2.0, lodash@^4.2.1:
   version "4.17.4"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.4.tgz#78203a4d1c328ae1d86dca6460e369b57f4055ae"
@@ -4838,7 +4928,7 @@ mem@^1.1.0:
   dependencies:
     mimic-fn "^1.0.0"
 
-meow@^3.3.0:
+meow@^3.3.0, meow@^3.7.0:
   version "3.7.0"
   resolved "https://registry.yarnpkg.com/meow/-/meow-3.7.0.tgz#72cb668b425228290abbfa856892587308a801fb"
   dependencies:
@@ -4953,7 +5043,7 @@ minimatch@0.3:
     lru-cache "2"
     sigmund "~1.0.0"
 
-"minimatch@2 || 3", minimatch@^3.0.0, minimatch@^3.0.2, minimatch@^3.0.3, minimatch@^3.0.4:
+"minimatch@2 || 3", minimatch@^3.0.0, minimatch@^3.0.2, minimatch@^3.0.3, minimatch@^3.0.4, minimatch@~3.0.2:
   version "3.0.4"
   resolved "https://registry.yarnpkg.com/minimatch/-/minimatch-3.0.4.tgz#5166e286457f03306064be5497e8dbb0c3d32083"
   dependencies:
@@ -5094,6 +5184,10 @@ mute-stream@0.0.6:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/mute-stream/-/mute-stream-0.0.6.tgz#48962b19e169fd1dfc240b3f1e7317627bbc47db"
 
+nan@^2.10.0:
+  version "2.10.0"
+  resolved "https://registry.yarnpkg.com/nan/-/nan-2.10.0.tgz#96d0cd610ebd58d4b4de9cc0c6828cda99c7548f"
+
 nan@^2.3.0:
   version "2.8.0"
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.8.0.tgz#ed715f3fe9de02b57a5e6252d90a96675e1f085a"
@@ -5166,6 +5260,23 @@ node-fetch@^2.0.0, node-fetch@^2.1.2:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.1.2.tgz#ab884e8e7e57e38a944753cec706f788d1768bb5"
 
+node-gyp@^3.3.1:
+  version "3.7.0"
+  resolved "https://registry.yarnpkg.com/node-gyp/-/node-gyp-3.7.0.tgz#789478e8f6c45e277aa014f3e28f958f286f9203"
+  dependencies:
+    fstream "^1.0.0"
+    glob "^7.0.3"
+    graceful-fs "^4.1.2"
+    mkdirp "^0.5.0"
+    nopt "2 || 3"
+    npmlog "0 || 1 || 2 || 3 || 4"
+    osenv "0"
+    request ">=2.9.0 <2.82.0"
+    rimraf "2"
+    semver "~5.3.0"
+    tar "^2.0.0"
+    which "1"
+
 node-int64@^0.4.0:
   version "0.4.0"
   resolved "https://registry.yarnpkg.com/node-int64/-/node-int64-0.4.0.tgz#87a9065cdb355d3182d8f94ce11188b825c68a3b"
@@ -5195,6 +5306,30 @@ node-pre-gyp@^0.6.39:
     tar "^2.2.1"
     tar-pack "^3.4.0"
 
+node-sass@^4.9.0:
+  version "4.9.0"
+  resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-4.9.0.tgz#d1b8aa855d98ed684d6848db929a20771cc2ae52"
+  dependencies:
+    async-foreach "^0.1.3"
+    chalk "^1.1.1"
+    cross-spawn "^3.0.0"
+    gaze "^1.0.0"
+    get-stdin "^4.0.1"
+    glob "^7.0.3"
+    in-publish "^2.0.0"
+    lodash.assign "^4.2.0"
+    lodash.clonedeep "^4.3.2"
+    lodash.mergewith "^4.6.0"
+    meow "^3.7.0"
+    mkdirp "^0.5.1"
+    nan "^2.10.0"
+    node-gyp "^3.3.1"
+    npmlog "^4.0.0"
+    request "~2.79.0"
+    sass-graph "^2.2.4"
+    stdout-stream "^1.4.0"
+    "true-case-path" "^1.0.2"
+
 nodemailer@^4.6.4:
   version "4.6.4"
   resolved "https://registry.yarnpkg.com/nodemailer/-/nodemailer-4.6.4.tgz#f0d72d0c6a6ec5f4369fa8f4bf5127a31baa2014"
@@ -5206,6 +5341,12 @@ nomnom@~1.6.2:
     colors "0.5.x"
     underscore "~1.4.4"
 
+"nopt@2 || 3":
+  version "3.0.6"
+  resolved "https://registry.yarnpkg.com/nopt/-/nopt-3.0.6.tgz#c6465dbf08abcd4db359317f79ac68a646b28ff9"
+  dependencies:
+    abbrev "1"
+
 nopt@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/nopt/-/nopt-4.0.1.tgz#d0d4685afd5415193c8c7505602d0d17cd64474d"
@@ -5248,7 +5389,7 @@ npm-run-path@^2.0.0:
   dependencies:
     path-key "^2.0.0"
 
-npmlog@^4.0.2:
+"npmlog@0 || 1 || 2 || 3 || 4", npmlog@^4.0.0, npmlog@^4.0.2:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/npmlog/-/npmlog-4.1.2.tgz#08a7f2a8bf734604779a9efa4ad5cc717abb954b"
   dependencies:
@@ -5468,6 +5609,13 @@ os-tmpdir@^1.0.0, os-tmpdir@^1.0.1, os-tmpdir@~1.0.1, os-tmpdir@~1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
 
+osenv@0:
+  version "0.1.5"
+  resolved "https://registry.yarnpkg.com/osenv/-/osenv-0.1.5.tgz#85cdfafaeb28e8677f416e287592b5f3f49ea410"
+  dependencies:
+    os-homedir "^1.0.0"
+    os-tmpdir "^1.0.0"
+
 osenv@^0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/osenv/-/osenv-0.1.4.tgz#42fe6d5953df06c8064be6f176c3d05aaaa34644"
@@ -5928,6 +6076,10 @@ qs@^6.5.1, qs@~6.5.1:
   version "6.5.1"
   resolved "https://registry.yarnpkg.com/qs/-/qs-6.5.1.tgz#349cdf6eef89ec45c12d7d5eb3fc0c870343a6d8"
 
+qs@~6.3.0:
+  version "6.3.2"
+  resolved "https://registry.yarnpkg.com/qs/-/qs-6.3.2.tgz#e75bd5f6e268122a2a0e0bda630b2550c166502c"
+
 qs@~6.4.0:
   version "6.4.0"
   resolved "https://registry.yarnpkg.com/qs/-/qs-6.4.0.tgz#13e26d28ad6b0ffaa91312cd3bf708ed351e7233"
@@ -6462,7 +6614,7 @@ request-promise-native@^1.0.3:
     stealthy-require "^1.1.0"
     tough-cookie ">=2.3.3"
 
-request@2.81.0:
+request@2.81.0, "request@>=2.9.0 <2.82.0":
   version "2.81.0"
   resolved "https://registry.yarnpkg.com/request/-/request-2.81.0.tgz#c6928946a0e06c5f8d6f8a9333469ffda46298a0"
   dependencies:
@@ -6543,6 +6695,31 @@ request@^2.85.0:
     tunnel-agent "^0.6.0"
     uuid "^3.1.0"
 
+request@~2.79.0:
+  version "2.79.0"
+  resolved "https://registry.yarnpkg.com/request/-/request-2.79.0.tgz#4dfe5bf6be8b8cdc37fcf93e04b65577722710de"
+  dependencies:
+    aws-sign2 "~0.6.0"
+    aws4 "^1.2.1"
+    caseless "~0.11.0"
+    combined-stream "~1.0.5"
+    extend "~3.0.0"
+    forever-agent "~0.6.1"
+    form-data "~2.1.1"
+    har-validator "~2.0.6"
+    hawk "~3.1.3"
+    http-signature "~1.1.0"
+    is-typedarray "~1.0.0"
+    isstream "~0.1.2"
+    json-stringify-safe "~5.0.1"
+    mime-types "~2.1.7"
+    oauth-sign "~0.8.1"
+    qs "~6.3.0"
+    stringstream "~0.0.4"
+    tough-cookie "~2.3.0"
+    tunnel-agent "~0.4.1"
+    uuid "^3.0.0"
+
 require-directory@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/require-directory/-/require-directory-2.1.1.tgz#8c64ad5fd30dab1c976e2344ffe7f792a6a6df42"
@@ -6704,6 +6881,15 @@ sane@^2.0.0:
   optionalDependencies:
     fsevents "^1.1.1"
 
+sass-graph@^2.2.4:
+  version "2.2.4"
+  resolved "https://registry.yarnpkg.com/sass-graph/-/sass-graph-2.2.4.tgz#13fbd63cd1caf0908b9fd93476ad43a51d1e0b49"
+  dependencies:
+    glob "^7.0.0"
+    lodash "^4.0.0"
+    scss-tokenizer "^0.2.3"
+    yargs "^7.0.0"
+
 sax@0.5.3:
   version "0.5.3"
   resolved "https://registry.yarnpkg.com/sax/-/sax-0.5.3.tgz#3773714a0d9157caaa7302971efa5c6dcda552d6"
@@ -6720,6 +6906,13 @@ scroll-into-view@^1.3.0:
   version "1.9.1"
   resolved "https://registry.yarnpkg.com/scroll-into-view/-/scroll-into-view-1.9.1.tgz#90c3b338422f9fddaebad90e6954790940dc9c1e"
 
+scss-tokenizer@^0.2.3:
+  version "0.2.3"
+  resolved "https://registry.yarnpkg.com/scss-tokenizer/-/scss-tokenizer-0.2.3.tgz#8eb06db9a9723333824d3f5530641149847ce5d1"
+  dependencies:
+    js-base64 "^2.1.8"
+    source-map "^0.4.2"
+
 select@^1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/select/-/select-1.1.2.tgz#0e7350acdec80b1108528786ec1d4418d11b396d"
@@ -6740,6 +6933,10 @@ semver@^5.4.1, semver@^5.5.0:
   version "5.5.0"
   resolved "https://registry.yarnpkg.com/semver/-/semver-5.5.0.tgz#dc4bbc7a6ca9d916dee5d43516f0092b58f7b8ab"
 
+semver@~5.3.0:
+  version "5.3.0"
+  resolved "https://registry.yarnpkg.com/semver/-/semver-5.3.0.tgz#9b2ce5d3de02d17c6012ad326aa6b4d0cf54f94f"
+
 sequencify@~0.0.7:
   version "0.0.7"
   resolved "https://registry.yarnpkg.com/sequencify/-/sequencify-0.0.7.tgz#90cff19d02e07027fd767f5ead3e7b95d1e7380c"
@@ -6933,7 +7130,7 @@ source-map@^0.1.38, source-map@~0.1.30, source-map@~0.1.33:
   dependencies:
     amdefine ">=0.0.4"
 
-source-map@^0.4.4:
+source-map@^0.4.2, source-map@^0.4.4:
   version "0.4.4"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.4.4.tgz#eba4f5da9c0dc999de68032d8b4f76173652036b"
   dependencies:
@@ -7040,6 +7237,12 @@ static-module@^1.1.0:
   version "1.4.0"
   resolved "https://registry.yarnpkg.com/statuses/-/statuses-1.4.0.tgz#bb73d446da2796106efcc1b601a253d6c46bd087"
 
+stdout-stream@^1.4.0:
+  version "1.4.0"
+  resolved "https://registry.yarnpkg.com/stdout-stream/-/stdout-stream-1.4.0.tgz#a2c7c8587e54d9427ea9edb3ac3f2cd522df378b"
+  dependencies:
+    readable-stream "^2.0.1"
+
 stealthy-require@^1.1.0:
   version "1.1.1"
   resolved "https://registry.yarnpkg.com/stealthy-require/-/stealthy-require-1.1.1.tgz#35b09875b4ff49f26a777e509b3090a3226bf24b"
@@ -7297,7 +7500,7 @@ tar-stream@^1.1.2:
     readable-stream "^2.0.0"
     xtend "^4.0.0"
 
-tar@^2.2.1:
+tar@^2.0.0, tar@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/tar/-/tar-2.2.1.tgz#8e4d2a256c0e2185c6b18ad694aec968b83cb1d1"
   dependencies:
@@ -7509,6 +7712,12 @@ trim-right@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/trim-right/-/trim-right-1.0.1.tgz#cb2e1203067e0c8de1f614094b9fe45704ea6003"
 
+"true-case-path@^1.0.2":
+  version "1.0.2"
+  resolved "https://registry.yarnpkg.com/true-case-path/-/true-case-path-1.0.2.tgz#7ec91130924766c7f573be3020c34f8fdfd00d62"
+  dependencies:
+    glob "^6.0.4"
+
 tslib@^1.9.0:
   version "1.9.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.9.0.tgz#e37a86fda8cbbaf23a057f473c9f4dc64e5fc2e8"
@@ -7519,6 +7728,10 @@ tunnel-agent@^0.6.0:
   dependencies:
     safe-buffer "^5.0.1"
 
+tunnel-agent@~0.4.1:
+  version "0.4.3"
+  resolved "https://registry.yarnpkg.com/tunnel-agent/-/tunnel-agent-0.4.3.tgz#6373db76909fe570e08d73583365ed828a74eeeb"
+
 tweetnacl@^0.14.3, tweetnacl@~0.14.0:
   version "0.14.5"
   resolved "https://registry.yarnpkg.com/tweetnacl/-/tweetnacl-0.14.5.tgz#5ae68177f192d4456269d108afa93ff8743f4f64"
@@ -7880,10 +8093,20 @@ whatwg-url@^6.3.0:
     tr46 "^1.0.0"
     webidl-conversions "^4.0.1"
 
+which-module@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/which-module/-/which-module-1.0.0.tgz#bba63ca861948994ff307736089e3b96026c2a4f"
+
 which-module@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/which-module/-/which-module-2.0.0.tgz#d9ef07dce77b9902b8a3a8fa4b31c3e3f7e6e87a"
 
+which@1:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/which/-/which-1.3.1.tgz#a45043d54f5805316da8d62f9f50918d3da70b0a"
+  dependencies:
+    isexe "^2.0.0"
+
 which@^1.2.12, which@^1.2.14, which@^1.2.9, which@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/which/-/which-1.3.0.tgz#ff04bdfc010ee547d780bec38e1ac1c2777d253a"
@@ -8024,6 +8247,12 @@ yargs-parser@^2.4.0:
     camelcase "^3.0.0"
     lodash.assign "^4.0.6"
 
+yargs-parser@^5.0.0:
+  version "5.0.0"
+  resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-5.0.0.tgz#275ecf0d7ffe05c77e64e7c86e4cd94bf0e1228a"
+  dependencies:
+    camelcase "^3.0.0"
+
 yargs-parser@^8.1.0:
   version "8.1.0"
   resolved "https://registry.yarnpkg.com/yargs-parser/-/yargs-parser-8.1.0.tgz#f1376a33b6629a5d063782944da732631e966950"
@@ -8065,6 +8294,24 @@ yargs@^10.0.3:
     y18n "^3.2.1"
     yargs-parser "^8.1.0"
 
+yargs@^7.0.0:
+  version "7.1.0"
+  resolved "https://registry.yarnpkg.com/yargs/-/yargs-7.1.0.tgz#6ba318eb16961727f5d284f8ea003e8d6154d0c8"
+  dependencies:
+    camelcase "^3.0.0"
+    cliui "^3.2.0"
+    decamelize "^1.1.1"
+    get-caller-file "^1.0.1"
+    os-locale "^1.4.0"
+    read-pkg-up "^1.0.1"
+    require-directory "^2.1.1"
+    require-main-filename "^1.0.1"
+    set-blocking "^2.0.0"
+    string-width "^1.0.2"
+    which-module "^1.0.0"
+    y18n "^3.2.1"
+    yargs-parser "^5.0.0"
+
 yargs@~3.10.0:
   version "3.10.0"
   resolved "https://registry.yarnpkg.com/yargs/-/yargs-3.10.0.tgz#f7ee7bd857dd7c1d2d38c0e74efbd681d1431fd1"