add a test to lock issues similar to 5457

Author: archmoj

.circleci/config.yml

@@ -169,6 +169,9 @@ jobs:
       - run:
           name: Test plotly bundles againt unexpected characters
           command: npm run no-bad-char
+      - run:
+          name: Test plotly bundles againt duplicate keys
+          command: npm run no-dup-keys
       - run:
           name: Test certain bundles against function constructors
           command: npm run no-new-func

package.json

@@ -33,6 +33,7 @@
     "lint-fix": "eslint . --fix || true",
     "no-new-func": "eslint --no-ignore --no-eslintrc --no-inline-config --rule '{no-new-func: error}' $(find dist -type f -iname '*.js' | grep -v plotly-gl* | grep -v plotly-with-meta.* | grep -v plotly.js | grep -v plotly.min.js | grep -v MathJax.js)",
     "no-bad-char": "eslint --no-ignore --no-eslintrc --no-inline-config --rule '{no-misleading-character-class: error}' $(find dist -type f -iname '*.js' | grep plotly)",
+    "no-dup-keys": "eslint --no-ignore --no-eslintrc --no-inline-config --rule '{no-dupe-keys: error}' $(find dist -type f -iname '*.js' | grep plotly)",
     "docker": "node tasks/docker.js",
     "pretest": "node tasks/pretest.js",
     "test-jasmine": "karma start test/jasmine/karma.conf.js",