Fixes ts installation

.gitlab-ci.yml

@@ -47,6 +47,7 @@ build:
   script:
     - echo $STAGING_SERVER_ENDPOINTS > src/assets/serverEndpoint.json
     - npm install
+    - npm install typescript@3.1.6
     - npm run build:SSR
   artifacts:
     paths:

package.json

@@ -101,7 +101,7 @@
     "ts-node": "~7.0.1",
     "tslib": "^1.9.3",
     "tslint": "~5.11.0",
-    "typescript": "^3.1.6",
+    "typescript": "~3.1.6",
     "webpack-cli": "^3.1.2",
     "webpack-node-externals": "^1.7.2"
   },