react-docgen is set to run against all jsx and js files, as a result …

…jest test files will throw warnings. Add example ignore pattern that will prevent this and give users a starting point to setup their own ignore without having to determine the format / escaping

{{cookiecutter.project_shortname}}/package.json

@@ -18,7 +18,7 @@
     "validate-init": "python _validate_init.py",
     "prepublishOnly": "npm run validate-init",
     "build:js": "webpack --mode production",
-    "build:backends": "dash-generate-components ./src/lib/components {{ cookiecutter.project_shortname }} -p package-info.json --r-prefix '{{ cookiecutter.r_prefix }}' --jl-prefix '{{ cookiecutter.jl_prefix }}'",
+    "build:backends": "dash-generate-components ./src/lib/components {{ cookiecutter.project_shortname }} -p package-info.json --r-prefix '{{ cookiecutter.r_prefix }}' --jl-prefix '{{ cookiecutter.jl_prefix }}' --ignore \\.(test|spec)\\.",
     "build:backends-activated": "(. venv/bin/activate || venv\\scripts\\activate && npm run build:py_and_r)",
     "build": "npm run build:js && npm run build:backends",
     "build:activated": "npm run build:js && npm run build:backends-activated"