Failed to execute 'define' on 'CustomElementRegistry' when using ClarityIcons - angularjs

Question

In my application I want to use ClarityIcons.add() to add a custom icon. However I get the following error:
index.js:402 Uncaught DOMException: Failed to execute 'define' on 'CustomElementRegistry': this name has already been used with this registry
at Object../src/clr-icons/index.ts (http://localhost:4200/vendor.js:84958:20)
at __webpack_require__ (http://localhost:4200/vendor.js:84586:30)
at ./src/clr-icons/clr-icons-api.ts.Object.defineProperty.value (http://localhost:4200/vendor.js:84635:18)
at http://localhost:4200/vendor.js:84638:10
at webpackUniversalModuleDefinition (http://localhost:4200/vendor.js:84564:20)
at Object../node_modules/#clr/icons/index.js (http://localhost:4200/vendor.js:84566:3)
at __webpack_require__ (http://localhost:4200/runtime.js:84:30)
at Module../src/app/core/components/core/core.component.ts (http://localhost:4200/main.js:1528:68)
at __webpack_require__ (http://localhost:4200/runtime.js:84:30)
at Module../src/app/app.module.ts (http://localhost:4200/main.js:618:94)
I tried reproducing it in a stackblitz but there it worked fine. In other questions I read about deleting the package-lock.json and then reinstalling node modules. I tried this but I still have the same result. Any idea where the error could be?

Answer 1

It looks like you are somehow including Clarity Icons twice in your app. Typically, this can happen if you include the pre-compiled clr-icons.min.js and also bundle the icons library as part of your own JS bundle.
Since you call ClarityIcons.add(), I'm guessing you import { ClarityIcons } from "#clr/icons";. If you do this, you want to remove clr-icons.min.js from your index.html and follow the "Load Clarity Icons API and icon sets in Typescript" section in the documentation: https://vmware.github.io/clarity/icons/clarity-icons