Make sure that our examples don't crash

Author: jessealama

.github/workflows/push.yaml

@@ -15,3 +15,5 @@ jobs:
               run: npx c8 npx jest
             - name: coverage
               run: npx c8 check-coverage --lines 99 --functions 99 --branches 99 --statements 99
+            - name: examples do not crash
+              run: for f in examples/*.js; do node $f || exit 1; done