add ci step

Author: dblythy

.babelrc

@@ -1,6 +1,6 @@
 {
     "plugins": [
-        "@babel/plugin-transform-flow-strip-types",
+        "@babel/plugin-transform-flow-strip-types"
     ],
     "presets": [
         "@babel/preset-typescript",

.github/workflows/ci.yml

@@ -138,6 +138,15 @@ jobs:
         uses: mansona/npm-lockfile-version@v1
         with:
           version: 2
+  check-types:
+    name: Check types
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - run: npm ci
+      - name: Check types
+        run: npm run test:types
   check-mongo:
     strategy:
       matrix: