What steps should I take to fix the error message "Uncaught TypeError: Class constructor m must be called with 'new'" that occurs while attempting to access a polymer v2.0 application?

Is there a way to resolve this error that occurs when attempting to open a Polymer v2.0 app on Safari in iOS?

Uncaught TypeError: Class constructor m cannot be invoked without 'new' from custom-elements-es5-adaptor.

The Polymer v2.0 starter kit runs smoothly on Chrome, but encounters the mentioned error when accessed on iOS.

Answer №1

The specifications state that Custom Elements should be implemented using ES6 classes (https://html.spec.whatwg.org/multipage/scripting.html#custom-element-conformance). However, since many browsers do not support ES6 yet, it might be necessary to transpile your project to ES5. It's important to note that ES5-style custom element classes will not function properly with native Custom Elements as they are unable to extend ES6 classes like HTMLElement.

To address this issue, make sure to include the custom-elements-es5-adapter.js script before defining any new Custom Elements.

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