Transpile TypeScript syntax

Support .ts files in the Babel build.

Author: wimpyprogrammer

.babelrc

@@ -1,5 +1,6 @@
 {
 	"presets": [
-		"@babel/env"
+		"@babel/env",
+		"@babel/preset-typescript"
 	]
 }

package.json

@@ -9,7 +9,7 @@
     "lib": "lib"
   },
   "scripts": {
-    "build": "npm run clean && babel src -d lib",
+    "build": "npm run clean && babel src -d lib --extensions '.js,.ts'",
     "clean": "rimraf lib/*",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
@@ -18,6 +18,7 @@
     "@babel/cli": "^7.0.0-beta.54",
     "@babel/core": "^7.0.0-beta.54",
     "@babel/preset-env": "^7.0.0-beta.54",
+    "@babel/preset-typescript": "^7.0.0-beta.54",
     "rimraf": "^2.6.2"
   }
 }

yarn.lock

@@ -259,6 +259,12 @@
   dependencies:
     "@babel/helper-plugin-utils" "7.0.0-beta.54"
 
+"@babel/plugin-syntax-typescript@7.0.0-beta.54":
+  version "7.0.0-beta.54"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-syntax-typescript/-/plugin-syntax-typescript-7.0.0-beta.54.tgz#7b01ddebccba8f78693bf2898e1f695bb8a76a7e"
+  dependencies:
+    "@babel/helper-plugin-utils" "7.0.0-beta.54"
+
 "@babel/plugin-transform-arrow-functions@7.0.0-beta.54":
   version "7.0.0-beta.54"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-arrow-functions/-/plugin-transform-arrow-functions-7.0.0-beta.54.tgz#44a977b8e61e4efcc7658bbbe260f204ca1bcf72"
@@ -439,6 +445,13 @@
   dependencies:
     "@babel/helper-plugin-utils" "7.0.0-beta.54"
 
+"@babel/plugin-transform-typescript@7.0.0-beta.54":
+  version "7.0.0-beta.54"
+  resolved "https://registry.yarnpkg.com/@babel/plugin-transform-typescript/-/plugin-transform-typescript-7.0.0-beta.54.tgz#7b614ba0dbea88b70ae82df9c429e128928c9251"
+  dependencies:
+    "@babel/helper-plugin-utils" "7.0.0-beta.54"
+    "@babel/plugin-syntax-typescript" "7.0.0-beta.54"
+
 "@babel/plugin-transform-unicode-regex@7.0.0-beta.54":
   version "7.0.0-beta.54"
   resolved "https://registry.yarnpkg.com/@babel/plugin-transform-unicode-regex/-/plugin-transform-unicode-regex-7.0.0-beta.54.tgz#1dc7e9150b39aaeb19fca1c863e082f6096afc60"
@@ -492,6 +505,13 @@
     js-levenshtein "^1.1.3"
     semver "^5.3.0"
 
+"@babel/preset-typescript@^7.0.0-beta.54":
+  version "7.0.0-beta.54"
+  resolved "https://registry.yarnpkg.com/@babel/preset-typescript/-/preset-typescript-7.0.0-beta.54.tgz#7491df7c0f20d08ca63c41f78d2c722c92470391"
+  dependencies:
+    "@babel/helper-plugin-utils" "7.0.0-beta.54"
+    "@babel/plugin-transform-typescript" "7.0.0-beta.54"
+
 "@babel/template@7.0.0-beta.54":
   version "7.0.0-beta.54"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.0.0-beta.54.tgz#d5b0d2d2d55c0e78b048c61a058f36cfd7d91af3"