add prettier

package.json

@@ -23,7 +23,8 @@
     "dev": "node src/shared/_build.js && rollup -c rollup/rollup.config.main.js -w",
     "dev:shared": "rollup -c rollup/rollup.config.shared.js -w",
     "pretest": "npm run build",
-    "prepublish": "npm run build && npm run lint"
+    "prepublish": "npm run build && npm run lint",
+    "prettier": "prettier --use-tabs --single-quote --write \"src/**/*.ts\" \"src/**/*.js\""
   },
   "repository": {
     "type": "git",
@@ -70,6 +71,7 @@
     "mocha": "^3.2.0",
     "node-resolve": "^1.3.3",
     "nyc": "^10.0.0",
+    "prettier": "^1.4.1",
     "reify": "^0.4.4",
     "rollup": "^0.39.0",
     "rollup-plugin-buble": "^0.15.0",

yarn.lock

@@ -2,6 +2,14 @@
 # yarn lockfile v1
 
 
+"@types/mocha@^2.2.41":
+  version "2.2.41"
+  resolved "https://registry.yarnpkg.com/@types/mocha/-/mocha-2.2.41.tgz#e27cf0817153eb9f2713b2d3f6c68f1e1c3ca608"
+
+"@types/node@^7.0.22":
+  version "7.0.27"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-7.0.27.tgz#ba5e1a87aca2b4f5817289615ffe56472927687e"
+
 abab@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/abab/-/abab-1.0.3.tgz#b81de5f7274ec4e756d797cd834f303642724e5d"
@@ -1915,6 +1923,12 @@ magic-string@^0.19.0, magic-string@~0.19.0:
   dependencies:
     vlq "^0.2.1"
 
+magic-string@^0.21.1:
+  version "0.21.3"
+  resolved "https://registry.yarnpkg.com/magic-string/-/magic-string-0.21.3.tgz#87e201009ebfde6f46dc5757305a70af71e31624"
+  dependencies:
+    vlq "^0.2.1"
+
 md5-hex@^1.2.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/md5-hex/-/md5-hex-1.3.0.tgz#d2c4afe983c4370662179b8cad145219135046c4"
@@ -2221,6 +2235,10 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
+prettier@^1.4.1:
+  version "1.4.1"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.4.1.tgz#3526cc46aea102e980db5b70cabe2020910ef142"
+
 private@^0.1.6:
   version "0.1.7"
   resolved "https://registry.yarnpkg.com/private/-/private-0.1.7.tgz#68ce5e8a1ef0a23bb570cc28537b5332aba63ef1"