diff --git a/.travis.yml b/.travis.yml
index 6aa44c4..2d0b563 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,9 +1,7 @@
 language: node_js
 node_js:
-  - "6"
-  - "8"
   - "10"
-  - "11"
+  - "12"
 
 cache:
   yarn: true
diff --git a/package.json b/package.json
index 214f1e9..a02836b 100644
--- a/package.json
+++ b/package.json
@@ -38,8 +38,8 @@
   "dependencies": {
     "@babel/core": "^7.11.0",
     "@babel/polyfill": "^7.10.4",
-    "broccoli-funnel": "^2.0.2",
-    "broccoli-merge-trees": "^3.0.2",
+    "broccoli-funnel": "^3.0.3",
+    "broccoli-merge-trees": "^4.2.0",
     "broccoli-persistent-filter": "^2.2.1",
     "clone": "^2.1.2",
     "hash-for-dep": "^1.4.7",
@@ -47,7 +47,7 @@
     "heimdalljs-logger": "^0.1.9",
     "json-stable-stringify": "^1.0.1",
     "rsvp": "^4.8.4",
-    "workerpool": "^3.1.1"
+    "workerpool": "^6.0.2"
   },
   "devDependencies": {
     "@babel/plugin-transform-block-scoping": "^7.10.5",
@@ -65,6 +65,6 @@
     "ps-node": "^0.1.6"
   },
   "engines": {
-    "node": ">= 6"
+    "node": "10.* || >= 12.*"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index a36a029..8127038 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -9,13 +9,6 @@
   dependencies:
     "@babel/highlight" "^7.10.4"
 
-"@babel/code-frame@^7.8.3":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.8.3.tgz#33e25903d7481181534e12ec0a25f16b6fcf419e"
-  integrity sha512-a9gxpmdXtZEInkCSHUJDLHZVBgb1QS0jhss4cPP93EW7s+uC5bikET2twEF3KV+7rDblJcmNvTR7VJejqd2C2g==
-  dependencies:
-    "@babel/highlight" "^7.8.3"
-
 "@babel/core@^7.11.0":
   version "7.11.0"
   resolved "https://registry.yarnpkg.com/@babel/core/-/core-7.11.0.tgz#73b9c33f1658506887f767c26dae07798b30df76"
@@ -38,27 +31,6 @@
     semver "^5.4.1"
     source-map "^0.5.0"
 
-"@babel/core@^7.3.4":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/core/-/core-7.8.3.tgz#30b0ebb4dd1585de6923a0b4d179e0b9f5d82941"
-  integrity sha512-4XFkf8AwyrEG7Ziu3L2L0Cv+WyY47Tcsp70JFmpftbAA1K7YL/sgE9jh9HyNj08Y/U50ItUchpN0w6HxAoX1rA==
-  dependencies:
-    "@babel/code-frame" "^7.8.3"
-    "@babel/generator" "^7.8.3"
-    "@babel/helpers" "^7.8.3"
-    "@babel/parser" "^7.8.3"
-    "@babel/template" "^7.8.3"
-    "@babel/traverse" "^7.8.3"
-    "@babel/types" "^7.8.3"
-    convert-source-map "^1.7.0"
-    debug "^4.1.0"
-    gensync "^1.0.0-beta.1"
-    json5 "^2.1.0"
-    lodash "^4.17.13"
-    resolve "^1.3.2"
-    semver "^5.4.1"
-    source-map "^0.5.0"
-
 "@babel/generator@^7.11.0":
   version "7.11.0"
   resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.11.0.tgz#4b90c78d8c12825024568cbe83ee6c9af193585c"
@@ -68,16 +40,6 @@
     jsesc "^2.5.1"
     source-map "^0.5.0"
 
-"@babel/generator@^7.8.3":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.8.3.tgz#0e22c005b0a94c1c74eafe19ef78ce53a4d45c03"
-  integrity sha512-WjoPk8hRpDRqqzRpvaR8/gDUPkrnOOeuT2m8cNICJtZH6mwaCo3v0OKMI7Y6SM1pBtyijnLtAL0HDi41pf41ug==
-  dependencies:
-    "@babel/types" "^7.8.3"
-    jsesc "^2.5.1"
-    lodash "^4.17.13"
-    source-map "^0.5.0"
-
 "@babel/helper-annotate-as-pure@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-annotate-as-pure/-/helper-annotate-as-pure-7.10.4.tgz#5bf0d495a3f757ac3bda48b5bf3b3ba309c72ba3"
@@ -103,15 +65,6 @@
     "@babel/template" "^7.10.4"
     "@babel/types" "^7.10.4"
 
-"@babel/helper-function-name@^7.8.3":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.8.3.tgz#eeeb665a01b1f11068e9fb86ad56a1cb1a824cca"
-  integrity sha512-BCxgX1BC2hD/oBlIFUgOCQDOPV8nSINxCwM3o93xP4P9Fq6aV5sgv2cOOITDMtCfQ+3PvHp3l689XZvAM9QyOA==
-  dependencies:
-    "@babel/helper-get-function-arity" "^7.8.3"
-    "@babel/template" "^7.8.3"
-    "@babel/types" "^7.8.3"
-
 "@babel/helper-get-function-arity@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.10.4.tgz#98c1cbea0e2332f33f9a4661b8ce1505b2c19ba2"
@@ -119,13 +72,6 @@
   dependencies:
     "@babel/types" "^7.10.4"
 
-"@babel/helper-get-function-arity@^7.8.3":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.8.3.tgz#b894b947bd004381ce63ea1db9f08547e920abd5"
-  integrity sha512-FVDR+Gd9iLjUMY1fzE2SR0IuaJToR4RkCDARVfsBBPSP53GEqSFjD8gNyxg246VUyc/ALRxFaAK8rVG7UT7xRA==
-  dependencies:
-    "@babel/types" "^7.8.3"
-
 "@babel/helper-member-expression-to-functions@^7.10.4":
   version "7.11.0"
   resolved "https://registry.yarnpkg.com/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.11.0.tgz#ae69c83d84ee82f4b42f96e2a09410935a8f26df"
@@ -190,13 +136,6 @@
   dependencies:
     "@babel/types" "^7.11.0"
 
-"@babel/helper-split-export-declaration@^7.8.3":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.8.3.tgz#31a9f30070f91368a7182cf05f831781065fc7a9"
-  integrity sha512-3x3yOeyBhW851hroze7ElzdkeRXQYQbFIb7gLK1WQYsw2GWDay5gAJNw1sWJ0VFP6z5J1whqeXH/WCdCjZv6dA==
-  dependencies:
-    "@babel/types" "^7.8.3"
-
 "@babel/helper-validator-identifier@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/helper-validator-identifier/-/helper-validator-identifier-7.10.4.tgz#a78c7a7251e01f616512d31b10adcf52ada5e0d2"
@@ -211,15 +150,6 @@
     "@babel/traverse" "^7.10.4"
     "@babel/types" "^7.10.4"
 
-"@babel/helpers@^7.8.3":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/helpers/-/helpers-7.8.3.tgz#382fbb0382ce7c4ce905945ab9641d688336ce85"
-  integrity sha512-LmU3q9Pah/XyZU89QvBgGt+BCsTPoQa+73RxAQh8fb8qkDyIfeQnmgs+hvzhTCKTzqOyk7JTkS3MS1S8Mq5yrQ==
-  dependencies:
-    "@babel/template" "^7.8.3"
-    "@babel/traverse" "^7.8.3"
-    "@babel/types" "^7.8.3"
-
 "@babel/highlight@^7.10.4":
   version "7.10.4"
   resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.10.4.tgz#7d1bdfd65753538fabe6c38596cdb76d9ac60143"
@@ -229,25 +159,11 @@
     chalk "^2.0.0"
     js-tokens "^4.0.0"
 
-"@babel/highlight@^7.8.3":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.8.3.tgz#28f173d04223eaaa59bc1d439a3836e6d1265797"
-  integrity sha512-PX4y5xQUvy0fnEVHrYOarRPXVWafSjTW9T0Hab8gVIawpl2Sj0ORyrygANq+KjcNlSSTw0YCLSNA8OyZ1I4yEg==
-  dependencies:
-    chalk "^2.0.0"
-    esutils "^2.0.2"
-    js-tokens "^4.0.0"
-
 "@babel/parser@^7.10.4", "@babel/parser@^7.11.0":
   version "7.11.0"
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.11.0.tgz#a9d7e11aead25d3b422d17b2c6502c8dddef6a5d"
   integrity sha512-qvRvi4oI8xii8NllyEc4MDJjuZiNaRzyb7Y7lup1NqJV8TZHF4O27CcP+72WPn/k1zkgJ6WJfnIbk4jTsVAZHw==
 
-"@babel/parser@^7.8.3":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.8.3.tgz#790874091d2001c9be6ec426c2eed47bc7679081"
-  integrity sha512-/V72F4Yp/qmHaTALizEm9Gf2eQHV3QyTL3K0cNfijwnMnb1L+LDlAubb/ZnSdGAVzVSWakujHYs1I26x66sMeQ==
-
 "@babel/plugin-transform-block-scoping@^7.10.5":
   version "7.10.5"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-block-scoping/-/plugin-transform-block-scoping-7.10.5.tgz#b81b8aafefbfe68f0f65f7ef397b9ece68a6037d"
@@ -302,15 +218,6 @@
     "@babel/parser" "^7.10.4"
     "@babel/types" "^7.10.4"
 
-"@babel/template@^7.8.3":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.8.3.tgz#e02ad04fe262a657809327f578056ca15fd4d1b8"
-  integrity sha512-04m87AcQgAFdvuoyiQ2kgELr2tV8B4fP/xJAVUL3Yb3bkNdMedD3d0rlSQr3PegP0cms3eHjl1F7PWlvWbU8FQ==
-  dependencies:
-    "@babel/code-frame" "^7.8.3"
-    "@babel/parser" "^7.8.3"
-    "@babel/types" "^7.8.3"
-
 "@babel/traverse@^7.10.4", "@babel/traverse@^7.11.0":
   version "7.11.0"
   resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.11.0.tgz#9b996ce1b98f53f7c3e4175115605d56ed07dd24"
@@ -326,21 +233,6 @@
     globals "^11.1.0"
     lodash "^4.17.19"
 
-"@babel/traverse@^7.8.3":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.8.3.tgz#a826215b011c9b4f73f3a893afbc05151358bf9a"
-  integrity sha512-we+a2lti+eEImHmEXp7bM9cTxGzxPmBiVJlLVD+FuuQMeeO7RaDbutbgeheDkw+Xe3mCfJHnGOWLswT74m2IPg==
-  dependencies:
-    "@babel/code-frame" "^7.8.3"
-    "@babel/generator" "^7.8.3"
-    "@babel/helper-function-name" "^7.8.3"
-    "@babel/helper-split-export-declaration" "^7.8.3"
-    "@babel/parser" "^7.8.3"
-    "@babel/types" "^7.8.3"
-    debug "^4.1.0"
-    globals "^11.1.0"
-    lodash "^4.17.13"
-
 "@babel/types@^7.10.4", "@babel/types@^7.10.5", "@babel/types@^7.11.0":
   version "7.11.0"
   resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.11.0.tgz#2ae6bf1ba9ae8c3c43824e5861269871b206e90d"
@@ -350,15 +242,6 @@
     lodash "^4.17.19"
     to-fast-properties "^2.0.0"
 
-"@babel/types@^7.8.3":
-  version "7.8.3"
-  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.8.3.tgz#5a383dffa5416db1b73dedffd311ffd0788fb31c"
-  integrity sha512-jBD+G8+LWpMBBWvVcdr4QysjUE4mU/syrhN17o1u3gx0/WzJB1kwiVZAXRtWbsIPOwW8pF/YJV5+nmetPzepXg==
-  dependencies:
-    esutils "^2.0.2"
-    lodash "^4.17.13"
-    to-fast-properties "^2.0.0"
-
 "@types/events@*":
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/@types/events/-/events-3.0.0.tgz#2862f3f58a9a7f7c3e78d79f130dd4d71c25c2a7"
@@ -560,24 +443,21 @@ brace-expansion@^1.0.0, brace-expansion@^1.1.7:
     balanced-match "^1.0.0"
     concat-map "0.0.1"
 
-broccoli-funnel@^2.0.2:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/broccoli-funnel/-/broccoli-funnel-2.0.2.tgz#0edf629569bc10bd02cc525f74b9a38e71366a75"
-  integrity sha512-/vDTqtv7ipjEZQOVqO4vGDVAOZyuYzQ/EgGoyewfOgh1M7IQAToBKZI0oAQPgMBeFPPlIbfMuAngk+ohPBuaHQ==
+broccoli-funnel@^3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/broccoli-funnel/-/broccoli-funnel-3.0.3.tgz#26fd42632471f67a91f4770d1987118087219937"
+  integrity sha512-LPzZ91BwStoHZXdXHQAJeYORl189OrRKM5NdIi86SDU9wZ4s/3lV1PRFOiobDT/jKM10voM7CDzfvicHbCYxAQ==
   dependencies:
     array-equal "^1.0.0"
     blank-object "^1.0.1"
-    broccoli-plugin "^1.3.0"
-    debug "^2.2.0"
+    broccoli-plugin "^4.0.1"
+    debug "^4.1.1"
     fast-ordered-set "^1.0.0"
-    fs-tree-diff "^0.5.3"
+    fs-tree-diff "^2.0.1"
     heimdalljs "^0.2.0"
     minimatch "^3.0.0"
-    mkdirp "^0.5.0"
     path-posix "^1.0.0"
-    rimraf "^2.4.3"
-    symlink-or-copy "^1.0.0"
-    walk-sync "^0.3.1"
+    walk-sync "^2.0.2"
 
 broccoli-kitchen-sink-helpers@^0.2.5:
   version "0.2.9"
@@ -595,14 +475,33 @@ broccoli-kitchen-sink-helpers@^0.3.1:
     glob "^5.0.10"
     mkdirp "^0.5.1"
 
-broccoli-merge-trees@^3.0.2:
-  version "3.0.2"
-  resolved "https://registry.yarnpkg.com/broccoli-merge-trees/-/broccoli-merge-trees-3.0.2.tgz#f33b451994225522b5c9bcf27d59decfd8ba537d"
-  integrity sha512-ZyPAwrOdlCddduFbsMyyFzJUrvW6b04pMvDiAQZrCwghlvgowJDY+EfoXn+eR1RRA5nmGHJ+B68T63VnpRiT1A==
+broccoli-merge-trees@^4.2.0:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/broccoli-merge-trees/-/broccoli-merge-trees-4.2.0.tgz#692d3c163ecea08c5714a9434d664e628919f47c"
+  integrity sha512-nTrQe5AQtCrW4enLRvbD/vTLHqyW2tz+vsLXQe4IEaUhepuMGVKJJr+I8n34Vu6fPjmPLwTjzNC8izMIDMtHPw==
   dependencies:
-    broccoli-plugin "^1.3.0"
+    broccoli-plugin "^4.0.2"
     merge-trees "^2.0.0"
 
+broccoli-node-api@^1.6.0, broccoli-node-api@^1.7.0:
+  version "1.7.0"
+  resolved "https://registry.yarnpkg.com/broccoli-node-api/-/broccoli-node-api-1.7.0.tgz#391aa6edecd2a42c63c111b4162956b2fa288cb6"
+  integrity sha512-QIqLSVJWJUVOhclmkmypJJH9u9s/aWH4+FH6Q6Ju5l+Io4dtwqdPUNmDfw40o6sxhbZHhqGujDJuHTML1wG8Yw==
+
+broccoli-node-info@^2.1.0:
+  version "2.1.0"
+  resolved "https://registry.yarnpkg.com/broccoli-node-info/-/broccoli-node-info-2.1.0.tgz#ca84560e8570ff78565bea1699866ddbf58ad644"
+  integrity sha512-l6qDuboJThHfRVVWQVaTs++bFdrFTP0gJXgsWenczc1PavRVUmL1Eyb2swTAXXMpDOnr2zhNOBLx4w9AxkqbPQ==
+
+broccoli-output-wrapper@^3.2.1:
+  version "3.2.3"
+  resolved "https://registry.yarnpkg.com/broccoli-output-wrapper/-/broccoli-output-wrapper-3.2.3.tgz#e5c9de7c881570eb4c0b0d194bb12d9671b25a9b"
+  integrity sha512-vzbm4j59Wr5vr/O50LD43Np1jbLBWJ/vhppzL/UXWf39xac9grJtrlx9SSy+pDRNT2LGBHNIGPOhdqwp94q2Pg==
+  dependencies:
+    fs-extra "^8.1.0"
+    heimdalljs-logger "^0.1.10"
+    symlink-or-copy "^1.2.0"
+
 broccoli-persistent-filter@^2.2.1:
   version "2.3.1"
   resolved "https://registry.yarnpkg.com/broccoli-persistent-filter/-/broccoli-persistent-filter-2.3.1.tgz#4a052e0e0868b344c3a2977e35a3d497aa9eca72"
@@ -623,7 +522,7 @@ broccoli-persistent-filter@^2.2.1:
     sync-disk-cache "^1.3.3"
     walk-sync "^1.0.0"
 
-broccoli-plugin@^1.0.0, broccoli-plugin@^1.3.0:
+broccoli-plugin@^1.0.0:
   version "1.3.1"
   resolved "https://registry.yarnpkg.com/broccoli-plugin/-/broccoli-plugin-1.3.1.tgz#a26315732fb99ed2d9fb58f12a1e14e986b4fabd"
   integrity sha512-DW8XASZkmorp+q7J4EeDEZz+LoyKLAd2XZULXyD9l4m9/hAKV3vjHmB1kiUshcWAYMgTP1m2i4NnqCE/23h6AQ==
@@ -633,6 +532,19 @@ broccoli-plugin@^1.0.0, broccoli-plugin@^1.3.0:
     rimraf "^2.3.4"
     symlink-or-copy "^1.1.8"
 
+broccoli-plugin@^4.0.1, broccoli-plugin@^4.0.2:
+  version "4.0.3"
+  resolved "https://registry.yarnpkg.com/broccoli-plugin/-/broccoli-plugin-4.0.3.tgz#9dcfbfb6a1b27a37cc22e65c071719ce9f92bc1e"
+  integrity sha512-CtAIEYq5K+4yQv8c/BHymOteuyjDAJfvy/asu4LudIWcMSS7dTn3yGI5gNBkwHG+qlRangYkHJNVAcDZMQbSVQ==
+  dependencies:
+    broccoli-node-api "^1.6.0"
+    broccoli-output-wrapper "^3.2.1"
+    fs-merger "^3.1.0"
+    promise-map-series "^0.2.1"
+    quick-temp "^0.1.3"
+    rimraf "^3.0.0"
+    symlink-or-copy "^1.3.0"
+
 broccoli-slow-trees@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/broccoli-slow-trees/-/broccoli-slow-trees-1.1.0.tgz#426c5724e008107e4573f73e8a9ca702916b78f7"
@@ -915,12 +827,12 @@ debug@3.2.6, debug@^3.1.0:
   dependencies:
     ms "^2.1.1"
 
-debug@^4.1.0:
-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-4.1.1.tgz#3b72260255109c6b589cee050f1d516139664791"
-  integrity sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==
+debug@^4.1.0, debug@^4.1.1:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/debug/-/debug-4.2.0.tgz#7f150f93920e94c58f5574c2fd01a3110effe7f1"
+  integrity sha512-IX2ncY78vDTjZMFUdmsvIRFY2Cf4FnD0wRs+nQwJU8Lu99/tPFdb0VybiiMTPe3I6rQmwsqQqRBvxU+bZ/I8sg==
   dependencies:
-    ms "^2.1.1"
+    ms "2.1.2"
 
 decamelize@^1.1.1, decamelize@^1.2.0:
   version "1.2.0"
@@ -1052,11 +964,6 @@ esprima@^4.0.0:
   resolved "https://registry.yarnpkg.com/esprima/-/esprima-4.0.1.tgz#13b04cdb3e6c5d19df91ab6987a8695619b0aa71"
   integrity sha512-eGuFFw7Upda+g4p+QHvnW0RyTX/SVeJBDM/gCtMARO0cLuT2HcEKnTPvhjV6aGeqrCB/sbNop0Kszm0jsaWU4A==
 
-esutils@^2.0.2:
-  version "2.0.3"
-  resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.3.tgz#74d2eb4de0b8da1293711910d50775b9b710ef64"
-  integrity sha512-kVscqXk4OCp68SZ0dkgEKVi6/8ij300KBWTJq32P/dYeWTSwK41WyTxalN1eRmA5Z9UU/LX9D7FWSmV9SAYx6g==
-
 execa@^0.7.0:
   version "0.7.0"
   resolved "https://registry.yarnpkg.com/execa/-/execa-0.7.0.tgz#944becd34cc41ee32a63a9faf27ad5a65fc59777"
@@ -1188,17 +1095,28 @@ fs-extra@^7.0.1:
     jsonfile "^4.0.0"
     universalify "^0.1.0"
 
-fs-tree-diff@^0.5.3:
-  version "0.5.9"
-  resolved "https://registry.yarnpkg.com/fs-tree-diff/-/fs-tree-diff-0.5.9.tgz#a4ec6182c2f5bd80b9b83c8e23e4522e6f5fd946"
-  integrity sha512-872G8ax0kHh01m9n/2KDzgYwouKza0Ad9iFltBpNykvROvf2AGtoOzPJgGx125aolGPER3JuC7uZFrQ7bG1AZw==
+fs-extra@^8.0.1, fs-extra@^8.1.0:
+  version "8.1.0"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-8.1.0.tgz#49d43c45a88cd9677668cb7be1b46efdb8d2e1c0"
+  integrity sha512-yhlQgA6mnOJUKOsRUFsgJdQCvkKhcz8tlZG5HBQfReYZy46OwLcY+Zia0mtdHsOo9y/hP+CxMN0TU9QxoOtG4g==
   dependencies:
-    heimdalljs-logger "^0.1.7"
-    object-assign "^4.1.0"
-    path-posix "^1.0.0"
-    symlink-or-copy "^1.1.8"
+    graceful-fs "^4.2.0"
+    jsonfile "^4.0.0"
+    universalify "^0.1.0"
 
-fs-tree-diff@^2.0.0:
+fs-merger@^3.1.0:
+  version "3.1.0"
+  resolved "https://registry.yarnpkg.com/fs-merger/-/fs-merger-3.1.0.tgz#f30f74f6c70b2ff7333ec074f3d2f22298152f3b"
+  integrity sha512-RZ9JtqugaE8Rkt7idO5NSwcxEGSDZpLmVFjtVQUm3f+bWun7JAU6fKyU6ZJUeUnKdJwGx8uaro+K4QQfOR7vpA==
+  dependencies:
+    broccoli-node-api "^1.7.0"
+    broccoli-node-info "^2.1.0"
+    fs-extra "^8.0.1"
+    fs-tree-diff "^2.0.1"
+    rimraf "^2.6.3"
+    walk-sync "^2.0.2"
+
+fs-tree-diff@^2.0.0, fs-tree-diff@^2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/fs-tree-diff/-/fs-tree-diff-2.0.1.tgz#343e4745ab435ec39ebac5f9059ad919cd034afa"
   integrity sha512-x+CfAZ/lJHQqwlD64pYM5QxWjzWhSjroaVsr8PW831zOApL55qPibed0c+xebaLWVr2BnHFoHdrwOv8pzt8R5A==
@@ -1322,10 +1240,10 @@ globals@^11.1.0:
   resolved "https://registry.yarnpkg.com/globals/-/globals-11.12.0.tgz#ab8795338868a0babd8525758018c2a7eb95c42e"
   integrity sha512-WOBp/EEGUiIsJSp7wcv/y6MO+lV9UoncWqxuFfm8eBwzWNgyfBd6Gz+IeKQ9jCmyhoH99g15M3T+QaVHFjizVA==
 
-graceful-fs@^4.1.15, graceful-fs@^4.1.2, graceful-fs@^4.1.6:
-  version "4.2.3"
-  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.3.tgz#4a12ff1b60376ef09862c2093edd908328be8423"
-  integrity sha512-a30VEBm4PEdx1dRB7MFK7BejejvCvBronbLjht+sHuGYj8PHs7M/5Z+rt5lw551vZ7yfTCj4Vuyy3mSJytDWRQ==
+graceful-fs@^4.1.15, graceful-fs@^4.1.2, graceful-fs@^4.1.6, graceful-fs@^4.2.0:
+  version "4.2.4"
+  resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.4.tgz#2256bde14d3632958c465ebc96dc467ca07a29fb"
+  integrity sha512-WjKPNJF79dtJAVniUlGGWHYGz2jWxT6VhN/4m1NdkbZ2nOsEF+cI1Edgql5zCRhs/VsQYRvrXctxktVXZUkixw==
 
 growl@1.10.5:
   version "1.10.5"
@@ -1377,7 +1295,7 @@ he@1.2.0:
   resolved "https://registry.yarnpkg.com/he/-/he-1.2.0.tgz#84ae65fa7eafb165fddb61566ae14baf05664f0f"
   integrity sha512-F/1DnUGPopORZi0ni+CvrCgHQ5FyEAHRLSApuYWMmrbSwoN2Mn/7k+Gl38gJnR7yyDZk6WLXwiGod1JOWNDKGw==
 
-heimdalljs-logger@^0.1.7, heimdalljs-logger@^0.1.9:
+heimdalljs-logger@^0.1.10, heimdalljs-logger@^0.1.7, heimdalljs-logger@^0.1.9:
   version "0.1.10"
   resolved "https://registry.yarnpkg.com/heimdalljs-logger/-/heimdalljs-logger-0.1.10.tgz#90cad58aabb1590a3c7e640ddc6a4cd3a43faaf7"
   integrity sha512-pO++cJbhIufVI/fmB/u2Yty3KJD0TqNPecehFae0/eps0hkZ3b4Zc/PezUMOpYuHFQbA7FxHZxa305EhmjLj4g==
@@ -1575,13 +1493,6 @@ json5@^0.5.1:
   resolved "https://registry.yarnpkg.com/json5/-/json5-0.5.1.tgz#1eade7acc012034ad84e2396767ead9fa5495821"
   integrity sha1-Hq3nrMASA0rYTiOWdn6tn6VJWCE=
 
-json5@^2.1.0:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/json5/-/json5-2.1.1.tgz#81b6cb04e9ba496f1c7005d07b4368a2638f90b6"
-  integrity sha512-l+3HXD0GEI3huGq1njuqtzYK8OYJyXMkOLtQ53pjWh89tvWS2h6l+1zMkYWqlb57+SiQodKZyvMEFb2X+KrFhQ==
-  dependencies:
-    minimist "^1.2.0"
-
 json5@^2.1.2:
   version "2.1.3"
   resolved "https://registry.yarnpkg.com/json5/-/json5-2.1.3.tgz#c9b0f7fa9233bfe5807fe66fcf3a5617ed597d43"
@@ -1645,7 +1556,7 @@ locate-path@^3.0.0:
     p-locate "^3.0.0"
     path-exists "^3.0.0"
 
-lodash@^4.17.13, lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.19:
+lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.19:
   version "4.17.19"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.19.tgz#e48ddedbe30b3321783c5b4301fbd353bc1e4a4b"
   integrity sha512-JNvd8XER9GQX0v2qJgsaN/mzFCNA5BRe/j8JN9d+tWyGLSodKQHKFicdwNYzWwI3wjRnaKPsGj1XkBjx/F96DQ==
@@ -1769,11 +1680,6 @@ minimist@0.0.8:
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
   integrity sha1-hX/Kv8M5fSYluCKCYuhqp6ARsF0=
 
-minimist@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
-  integrity sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ=
-
 minimist@^1.2.5:
   version "1.2.5"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.5.tgz#67d66014b66a6a8aaa0c083c5fd58df4e4e97602"
@@ -1863,7 +1769,7 @@ ms@2.1.1:
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.1.tgz#30a5864eb3ebb0a66f2ebe6d727af06a09d86e0a"
   integrity sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==
 
-ms@^2.0.0, ms@^2.1.1:
+ms@2.1.2, ms@^2.0.0, ms@^2.1.1:
   version "2.1.2"
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.2.tgz#d09d1f357b443f493382a8eb3ccd183872ae6009"
   integrity sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==
@@ -1921,7 +1827,7 @@ number-is-nan@^1.0.0:
   resolved "https://registry.yarnpkg.com/number-is-nan/-/number-is-nan-1.0.1.tgz#097b602b53422a522c1afb8790318336941a011d"
   integrity sha1-CXtgK1NCKlIsGvuHkDGDNpQaAR0=
 
-object-assign@4.1.1, object-assign@^4.0.1, object-assign@^4.1.0:
+object-assign@^4.0.1, object-assign@^4.1.0:
   version "4.1.1"
   resolved "https://registry.yarnpkg.com/object-assign/-/object-assign-4.1.1.tgz#2109adc7965887cfc05cbbd442cac8bfbb360863"
   integrity sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=
@@ -2266,13 +2172,20 @@ retry@^0.10.0:
   resolved "https://registry.yarnpkg.com/retry/-/retry-0.10.1.tgz#e76388d217992c252750241d3d3956fed98d8ff4"
   integrity sha1-52OI0heZLCUnUCQdPTlW/tmNj/Q=
 
-rimraf@^2.2.8, rimraf@^2.3.4, rimraf@^2.4.3, rimraf@^2.5.3, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.2, rimraf@^2.6.3:
+rimraf@^2.2.8, rimraf@^2.3.4, rimraf@^2.5.3, rimraf@^2.5.4, rimraf@^2.6.1, rimraf@^2.6.2, rimraf@^2.6.3:
   version "2.7.1"
   resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-2.7.1.tgz#35797f13a7fdadc566142c29d4f07ccad483e3ec"
   integrity sha512-uWjbaKIK3T1OSVptzX7Nl6PvQ3qAGtKEtVRjRuazjfL3Bx5eI409VZSqgND+4UNnmzLVdPj9FqFJNPqBZFve4w==
   dependencies:
     glob "^7.1.3"
 
+rimraf@^3.0.0:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/rimraf/-/rimraf-3.0.2.tgz#f1a5402ba6220ad52cc1282bac1ae3aa49fd061a"
+  integrity sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==
+  dependencies:
+    glob "^7.1.3"
+
 rsvp@^3.0.14, rsvp@^3.0.17, rsvp@^3.0.18:
   version "3.6.2"
   resolved "https://registry.yarnpkg.com/rsvp/-/rsvp-3.6.2.tgz#2e96491599a96cde1b515d5674a8f7a91452926a"
@@ -2497,10 +2410,10 @@ supports-color@^5.3.0:
   dependencies:
     has-flag "^3.0.0"
 
-symlink-or-copy@^1.0.0, symlink-or-copy@^1.0.1, symlink-or-copy@^1.1.8:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/symlink-or-copy/-/symlink-or-copy-1.2.0.tgz#5d49108e2ab824a34069b68974486c290020b393"
-  integrity sha512-W31+GLiBmU/ZR02Ii0mVZICuNEN9daZ63xZMPDsYgPgNjMtg+atqLEGI7PPI936jYSQZxoLb/63xos8Adrx4Eg==
+symlink-or-copy@^1.0.1, symlink-or-copy@^1.1.8, symlink-or-copy@^1.2.0, symlink-or-copy@^1.3.0:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/symlink-or-copy/-/symlink-or-copy-1.3.1.tgz#9506dd64d8e98fa21dcbf4018d1eab23e77f71fe"
+  integrity sha512-0K91MEXFpBUaywiwSSkmKjnGcasG/rVBXFLJz5DrgGabpYD6N+3yZrfD6uUIfpuTu65DZLHi7N8CizHc07BPZA==
 
 sync-disk-cache@^1.3.3:
   version "1.3.4"
@@ -2639,14 +2552,6 @@ walk-sync@^0.2.6:
     ensure-posix-path "^1.0.0"
     matcher-collection "^1.0.0"
 
-walk-sync@^0.3.1:
-  version "0.3.4"
-  resolved "https://registry.yarnpkg.com/walk-sync/-/walk-sync-0.3.4.tgz#cf78486cc567d3a96b5b2237c6108017a5ffb9a4"
-  integrity sha512-ttGcuHA/OBnN2pcM6johpYlEms7XpO5/fyKIr48541xXedan4roO8cS1Q2S/zbbjGH/BarYDAMeS2Mi9HE5Tig==
-  dependencies:
-    ensure-posix-path "^1.0.0"
-    matcher-collection "^1.0.0"
-
 walk-sync@^1.0.0:
   version "1.1.4"
   resolved "https://registry.yarnpkg.com/walk-sync/-/walk-sync-1.1.4.tgz#81049f3d8095479b49574cfa5f558d7a252b127d"
@@ -2656,6 +2561,16 @@ walk-sync@^1.0.0:
     ensure-posix-path "^1.1.0"
     matcher-collection "^1.1.1"
 
+walk-sync@^2.0.2:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/walk-sync/-/walk-sync-2.2.0.tgz#80786b0657fcc8c0e1c0b1a042a09eae2966387a"
+  integrity sha512-IC8sL7aB4/ZgFcGI2T1LczZeFWZ06b3zoHH7jBPyHxOtIIz1jppWHjjEXkOFvFojBVAK9pV7g47xOZ4LW3QLfg==
+  dependencies:
+    "@types/minimatch" "^3.0.3"
+    ensure-posix-path "^1.1.0"
+    matcher-collection "^2.0.0"
+    minimatch "^3.0.4"
+
 which-module@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/which-module/-/which-module-2.0.0.tgz#d9ef07dce77b9902b8a3a8fa4b31c3e3f7e6e87a"
@@ -2680,14 +2595,10 @@ wordwrap@~0.0.2:
   resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-0.0.3.tgz#a3d5da6cd5c0bc0008d37234bbaf1bed63059107"
   integrity sha1-o9XabNXAvAAI03I0u68b7WMFkQc=
 
-workerpool@^3.1.1:
-  version "3.1.2"
-  resolved "https://registry.yarnpkg.com/workerpool/-/workerpool-3.1.2.tgz#b34e79243647decb174b7481ab5b351dc565c426"
-  integrity sha512-WJFA0dGqIK7qj7xPTqciWBH5DlJQzoPjsANvc3Y4hNB0SScT+Emjvt0jPPkDBUjBNngX1q9hHgt1Gfwytu6pug==
-  dependencies:
-    "@babel/core" "^7.3.4"
-    object-assign "4.1.1"
-    rsvp "^4.8.4"
+workerpool@^6.0.2:
+  version "6.0.2"
+  resolved "https://registry.yarnpkg.com/workerpool/-/workerpool-6.0.2.tgz#e241b43d8d033f1beb52c7851069456039d1d438"
+  integrity sha512-DSNyvOpFKrNusaaUwk+ej6cBj1bmhLcBfj80elGk+ZIo5JSkq+unB1dLKEOcNfJDZgjGICfhQ0Q5TbP0PvF4+Q==
 
 wrap-ansi@^2.0.0:
   version "2.1.0"