diff --git a/package.json b/package.json
index 1e1c4fe..759b573 100644
--- a/package.json
+++ b/package.json
@@ -25,13 +25,16 @@
   },
   "scripts": {
     "format": "prettier --write --no-semi --single-quote --trailing-comma all ./FastImage.js ./example/*.js ./server/*.js",
-    "test": "jest *.js"
+    "test": "yarn run test:lint && yarn run test:jest",
+    "test:jest": "jest *.js",
+    "test:lint": "prettier-check --write --no-semi --single-quote --trailing-comma all ./FastImage.js ./example/*.js ./server/*.js"
   },
   "devDependencies": {
     "babel-jest": "19.0.0",
     "babel-preset-react-native": "1.9.1",
     "jest": "^19.0.2",
     "prettier": "^1.1.0",
+    "prettier-check": "^1.0.0",
     "react": "16.0.0-alpha.6",
     "react-native": "0.43.3",
     "react-test-renderer": "16.0.0-alpha.6"
diff --git a/yarn.lock b/yarn.lock
index db2341f..7adf62e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -163,6 +163,14 @@ assert-plus@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/assert-plus/-/assert-plus-0.2.0.tgz#d74e1b87e7affc0db8aadb7021f3fe48101ab234"
 
+ast-types@0.8.18:
+  version "0.8.18"
+  resolved "https://registry.yarnpkg.com/ast-types/-/ast-types-0.8.18.tgz#c8b98574898e8914e9d8de74b947564a9fe929af"
+
+ast-types@0.9.4:
+  version "0.9.4"
+  resolved "https://registry.yarnpkg.com/ast-types/-/ast-types-0.9.4.tgz#410d1f81890aeb8e0a38621558ba5869ae53c91b"
+
 ast-types@0.9.8:
   version "0.9.8"
   resolved "https://registry.yarnpkg.com/ast-types/-/ast-types-0.9.8.tgz#6cb6a40beba31f49f20928e28439fc14a3dab078"
@@ -785,6 +793,10 @@ babel-types@^6.18.0, babel-types@^6.19.0, babel-types@^6.21.0, babel-types@^6.24
     lodash "^4.2.0"
     to-fast-properties "^1.0.1"
 
+babylon@6.15.0:
+  version "6.15.0"
+  resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.15.0.tgz#ba65cfa1a80e1759b0e89fb562e27dccae70348e"
+
 babylon@7.0.0-beta.8:
   version "7.0.0-beta.8"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-7.0.0-beta.8.tgz#2bdc5ae366041442c27e068cce6f0d7c06ea9949"
@@ -1000,6 +1012,10 @@ color-name@^1.1.1:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.2.tgz#5c8ab72b64bd2215d617ae9559ebb148475cf98d"
 
+colors@>=0.6.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/colors/-/colors-1.1.2.tgz#168a4701756b6a7f51a12ce0c97bfa28c084ed63"
+
 combined-stream@^1.0.5, combined-stream@~1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/combined-stream/-/combined-stream-1.0.5.tgz#938370a57b4a51dea2c77c15d5c5fdf895164009"
@@ -1143,7 +1159,7 @@ cross-spawn@^3.0.1:
     lru-cache "^4.0.1"
     which "^1.2.9"
 
-cross-spawn@^5.1.0:
+cross-spawn@^5.0.1, cross-spawn@^5.1.0:
   version "5.1.0"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-5.1.0.tgz#e8bd0efee58fcff6f8f94510a0a554bbfa235449"
   dependencies:
@@ -1352,6 +1368,18 @@ exec-sh@^0.2.0:
   dependencies:
     merge "^1.1.3"
 
+execa@^0.6.0:
+  version "0.6.3"
+  resolved "https://registry.yarnpkg.com/execa/-/execa-0.6.3.tgz#57b69a594f081759c69e5370f0d17b9cb11658fe"
+  dependencies:
+    cross-spawn "^5.0.1"
+    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"
@@ -1494,6 +1522,14 @@ find-up@^2.1.0:
   dependencies:
     locate-path "^2.0.0"
 
+flow-parser@0.40.0:
+  version "0.40.0"
+  resolved "https://registry.yarnpkg.com/flow-parser/-/flow-parser-0.40.0.tgz#b3444742189093323c4319c4fe9d35391f46bcbc"
+  dependencies:
+    ast-types "0.8.18"
+    colors ">=0.6.2"
+    minimist ">=0.2.0"
+
 flow-parser@0.43.0:
   version "0.43.0"
   resolved "https://registry.yarnpkg.com/flow-parser/-/flow-parser-0.43.0.tgz#e2b8eb1ac83dd53f7b6b04a7c35b6a52c33479b7"
@@ -1556,6 +1592,10 @@ get-stdin@5.0.1:
   version "5.0.1"
   resolved "https://registry.yarnpkg.com/get-stdin/-/get-stdin-5.0.1.tgz#122e161591e21ff4c52530305693f20e6393a398"
 
+get-stream@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/get-stream/-/get-stream-3.0.0.tgz#8e943d1358dc37555054ecbe2edb05aa174ede14"
+
 getpass@^0.1.1:
   version "0.1.6"
   resolved "https://registry.yarnpkg.com/getpass/-/getpass-0.1.6.tgz#283ffd9fc1256840875311c1b60e8c40187110e6"
@@ -1869,7 +1909,7 @@ is-primitive@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/is-primitive/-/is-primitive-2.0.0.tgz#207bab91638499c07b2adf240a41a87210034575"
 
-is-stream@^1.0.1:
+is-stream@^1.0.1, is-stream@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/is-stream/-/is-stream-1.1.0.tgz#12d4a3dd4e68e0b79ceb8dbc84173ae80d91ca44"
 
@@ -2521,13 +2561,13 @@ mime-db@~1.23.0:
   version "1.23.0"
   resolved "https://registry.yarnpkg.com/mime-db/-/mime-db-1.23.0.tgz#a31b4070adaea27d732ea333740a64d0ec9a6659"
 
-mime-types@2.1.11, mime-types@~2.1.7:
+mime-types@2.1.11:
   version "2.1.11"
   resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.11.tgz#c259c471bda808a85d6cd193b430a5fae4473b3c"
   dependencies:
     mime-db "~1.23.0"
 
-mime-types@^2.1.12, mime-types@~2.1.11, mime-types@~2.1.15, mime-types@~2.1.6, mime-types@~2.1.9:
+mime-types@^2.1.12, mime-types@~2.1.11, mime-types@~2.1.15, mime-types@~2.1.6, mime-types@~2.1.7, mime-types@~2.1.9:
   version "2.1.15"
   resolved "https://registry.yarnpkg.com/mime-types/-/mime-types-2.1.15.tgz#a4ebf5064094569237b8cf70046776d09fc92aed"
   dependencies:
@@ -2553,7 +2593,7 @@ minimist@0.0.8, minimist@~0.0.1:
   version "0.0.8"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-0.0.8.tgz#857fcabfc3397d2625b8228262e86aa7a011b05d"
 
-minimist@1.2.0, minimist@^1.1.0, minimist@^1.1.1, minimist@^1.2.0:
+minimist@1.2.0, minimist@>=0.2.0, minimist@^1.1.0, minimist@^1.1.1, minimist@^1.2.0:
   version "1.2.0"
   resolved "https://registry.yarnpkg.com/minimist/-/minimist-1.2.0.tgz#a35008b20f41383eec1fb914f4cd5df79a264284"
 
@@ -2653,6 +2693,12 @@ normalize-path@^2.0.1:
   dependencies:
     remove-trailing-separator "^1.0.1"
 
+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@^2.0.4:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/npmlog/-/npmlog-2.0.4.tgz#98b52530f2514ca90d09ec5b22c8846722375692"
@@ -2750,6 +2796,10 @@ os-tmpdir@^1.0.0, os-tmpdir@^1.0.1:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/os-tmpdir/-/os-tmpdir-1.0.2.tgz#bbe67406c79aa85c5cfec766fe5734555dfa1274"
 
+p-finally@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/p-finally/-/p-finally-1.0.0.tgz#3fbcfb15b899a44123b34b6dcc18b724336a2cae"
+
 p-limit@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/p-limit/-/p-limit-1.1.0.tgz#b07ff2d9a5d88bec806035895a2bab66a27988bc"
@@ -2797,6 +2847,10 @@ path-is-absolute@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/path-is-absolute/-/path-is-absolute-1.0.1.tgz#174b9268735534ffbc7ace6bf53a5a9e1b5c5f5f"
 
+path-key@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/path-key/-/path-key-2.0.1.tgz#411cadb574c5a140d3a4b1910d40d80cc9f40b40"
+
 path-parse@^1.0.5:
   version "1.0.5"
   resolved "https://registry.yarnpkg.com/path-parse/-/path-parse-1.0.5.tgz#3c1adf871ea9cd6c9431b6ea2bd74a0ff055c4c1"
@@ -2852,6 +2906,28 @@ preserve@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
 
+prettier-check@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/prettier-check/-/prettier-check-1.0.0.tgz#4d1d36428aff3586213df328e22e8f6b34d51916"
+  dependencies:
+    execa "^0.6.0"
+    prettier "^0.21.0"
+
+prettier@^0.21.0:
+  version "0.21.0"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-0.21.0.tgz#5187ab95fdd9ca63dccf6217ed03b434d72771f8"
+  dependencies:
+    ast-types "0.9.4"
+    babel-code-frame "6.22.0"
+    babylon "6.15.0"
+    chalk "1.1.3"
+    esutils "2.0.2"
+    flow-parser "0.40.0"
+    get-stdin "5.0.1"
+    glob "7.1.1"
+    jest-validate "19.0.0"
+    minimist "1.2.0"
+
 prettier@^1.1.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.1.0.tgz#9d6ad005703efefa66b6999b8916bfc6afeaf9f8"
@@ -3387,6 +3463,10 @@ shellwords@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/shellwords/-/shellwords-0.1.0.tgz#66afd47b6a12932d9071cbfd98a52e785cd0ba14"
 
+signal-exit@^3.0.0:
+  version "3.0.2"
+  resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-3.0.2.tgz#b5fdc08f1287ea1178628e415e25132b73646c6d"
+
 simple-plist@0.1.4:
   version "0.1.4"
   resolved "https://registry.yarnpkg.com/simple-plist/-/simple-plist-0.1.4.tgz#10eb51b47e33c556eb8ec46d5ee64d64e717db5d"
@@ -3534,6 +3614,10 @@ 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"
+
 supports-color@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-2.0.0.tgz#535d045ce6b6363fa40117084629995e9df324c7"