Revert "update typescript"

This reverts commit 6d372b26.

package-lock.json

@@ -1797,9 +1797,9 @@
       }
     },
     "gulp-typescript": {
-      "version": "3.2.2",
-      "resolved": "https://registry.npmjs.org/gulp-typescript/-/gulp-typescript-3.2.2.tgz",
-      "integrity": "sha1-t+Xh08s193LlPmBAJmAYJuK+d/w=",
+      "version": "3.1.7",
+      "resolved": "https://registry.npmjs.org/gulp-typescript/-/gulp-typescript-3.1.7.tgz",
+      "integrity": "sha1-2IYAqRQVPxHAnJpcqMJWHsdaSXg=",
       "dev": true,
       "requires": {
         "gulp-util": "3.0.8",
@@ -5830,9 +5830,10 @@
       }
     },
     "typescript": {
-      "version": "2.5.2",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.5.2.tgz",
-      "integrity": "sha1-A4qV99m7tCCxvzW6MdTFwd0//jQ="
+      "version": "2.3.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-2.3.4.tgz",
+      "integrity": "sha1-PTgyGCgjHkNPKHUUlZw3qCtin0I=",
+      "dev": true
     },
     "uglify-js": {
       "version": "2.8.28",

package.json

@@ -29,14 +29,14 @@
     "readline": "^1.3.0",
     "simple-git": "^1.72.0",
     "stream-transcoder": "0.0.5",
-    "typescript": "^2.5.2",
     "walk": "^2.3.9"
   },
   "devDependencies": {
     "@types/node": "7.0.29",
     "gulp-nodemon": "2.2.1",
     "gulp-postcss": "^7.0.0",
-    "gulp-typescript": "^3.2.2",
-    "mysql": "2.13.0"
+    "gulp-typescript": "^3.1.6",
+    "mysql": "2.13.0",
+    "typescript": "^2.3.4"
   }
 }