Add "format" npm script to Prettify all source files

Author: wimpyprogrammer

package.json

@@ -11,6 +11,7 @@
   "scripts": {
     "build": "npm run clean && babel src -d lib --extensions '.js,.ts'",
     "clean": "rimraf lib/*",
+    "format": "prettier --write 'src/**'",
     "lint": "tsc; tslint -p ./",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
@@ -20,6 +21,7 @@
     "@babel/core": "^7.0.0-beta.54",
     "@babel/preset-env": "^7.0.0-beta.54",
     "@babel/preset-typescript": "^7.0.0-beta.54",
+    "prettier": "^1.13.7",
     "rimraf": "^2.6.2",
     "tslint": "^5.11.0",
     "typescript": "^2.9.2"

yarn.lock

@@ -1467,6 +1467,10 @@ posix-character-classes@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/posix-character-classes/-/posix-character-classes-0.1.1.tgz#01eac0fe3b5af71a2a6c02feabb8c1fef7e00eab"
 
+prettier@^1.13.7:
+  version "1.13.7"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.13.7.tgz#850f3b8af784a49a6ea2d2eaa7ed1428a34b7281"
+
 private@^0.1.6:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"