The dev-dependencies of the plugin are quite outdated. More current versions should be used, e.g.:
"devDependencies": {
"bpmn-js": "^8.2.0",
"browserify": "^17.0.0",
"camunda-modeler-plugin-helpers": "^2.1.0",
"inherits": "^2.0.4",
"lodash": "^4.17.20",
"min-dom": "^1.0.0",
"diacritics": "^1.3.0",
"watchify": "^4.0.0"
}
The dev-dependencies of the plugin are quite outdated. More current versions should be used, e.g.: