chore: add missing dep (#598)

Author: eddyerburgh

Diff for: package.json

@@ -17,7 +17,7 @@
     "lint": "eslint --ext js,vue . --ignore-path .gitignore",
     "lint:docs": "eslint --ext js,vue,md docs --ignore-path .gitignore",
     "lint:fix": "npm run lint -- --fix",
-    "prepublish": "npm run build && npm run test:unit:only",
+    "prepublishOnly": "npm run build && npm run test:unit:only",
     "publish": "lerna publish --conventional-commits -m \"chore(release): publish %s\"",
     "test": "npm run lint && npm run lint:docs && npm run flow && npm run test:types && npm run test:unit && npm run test:unit:karma && npm run test:unit:node",
     "test:compat": "scripts/test-compat.sh",
@@ -62,6 +62,7 @@
     "lerna": "2",
     "mocha": "^3.5.0",
     "mocha-webpack": "^1.0.1",
+    "rollup": "^0.58.2",
     "sinon": "^2.3.2",
     "sinon-chai": "^2.10.0",
     "vue": "2.5.13",

Diff for: yarn.lock

@@ -3212,12 +3212,6 @@ from2@^2.1.0:
     inherits "^2.0.1"
     readable-stream "^2.0.0"
 
-fs-access@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/fs-access/-/fs-access-1.0.1.tgz#d6a87f262271cefebec30c553407fb995da8777a"
-  dependencies:
-    null-check "^1.0.0"
-
 [email protected]:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-3.0.1.tgz#3794f378c58b342ea7dbbb23095109c4b3b62291"
@@ -4390,13 +4384,6 @@ jsprim@^1.2.2:
     json-schema "0.2.3"
     verror "1.10.0"
 
-karma-chrome-launcher@^2.2.0:
-  version "2.2.0"
-  resolved "https://registry.yarnpkg.com/karma-chrome-launcher/-/karma-chrome-launcher-2.2.0.tgz#cf1b9d07136cc18fe239327d24654c3dbc368acf"
-  dependencies:
-    fs-access "^1.0.0"
-    which "^1.2.1"
-
 karma-mocha@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/karma-mocha/-/karma-mocha-1.3.0.tgz#eeaac7ffc0e201eb63c467440d2b69c7cf3778bf"
@@ -5568,10 +5555,6 @@ nth-check@~1.0.1:
   dependencies:
     boolbase "~1.0.0"
 
-null-check@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/null-check/-/null-check-1.0.0.tgz#977dffd7176012b9ec30d2a39db5cf72a0439edd"
-
 num2fraction@^1.2.2:
   version "1.2.2"
   resolved "https://registry.yarnpkg.com/num2fraction/-/num2fraction-1.2.2.tgz#6f682b6a027a4e9ddfa4564cd2589d1d4e669ede"
@@ -7054,6 +7037,13 @@ rollup@^0.57.1:
     signal-exit "^3.0.2"
     sourcemap-codec "^1.4.1"
 
+rollup@^0.58.2:
+  version "0.58.2"
+  resolved "https://registry.yarnpkg.com/rollup/-/rollup-0.58.2.tgz#2feddea8c0c022f3e74b35c48e3c21b3433803ce"
+  dependencies:
+    "@types/estree" "0.0.38"
+    "@types/node" "*"
+
 run-async@^2.2.0:
   version "2.3.0"
   resolved "https://registry.yarnpkg.com/run-async/-/run-async-2.3.0.tgz#0371ab4ae0bdd720d4166d7dfda64ff7a445a6c0"
@@ -8218,7 +8208,7 @@ 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, which@^1.2.1, which@^1.2.10, which@^1.2.12, which@^1.2.9:
+which@1, which@^1.2.10, which@^1.2.12, which@^1.2.9:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/which/-/which-1.3.0.tgz#ff04bdfc010ee547d780bec38e1ac1c2777d253a"
   dependencies: