"Encountered a TypeScript error (2345) when using customElements.define() in Lit 2

When we upgraded various lit-Components to version 2.1.1 

"lit": "2.1.1"
, a TypeScript error surfaced:

The argument 'typeof MyComponent' cannot be assigned to a parameter of type 'CustomElementConstructor'. The 'MyComponent' type is missing essential properties like accessKey, accessKeyLabel, autocapitalize, dir, and many more.

import { html, css, LitElement } from 'lit';

export default class MyComponent extends LitElement {...}

customElements.define('my-component', MyComponent);

Everything seems to be running smoothly - could this be an issue with lit itself?

typescriptlit

Answer №1

Using the decorator version in TypeScript is a more efficient alternative to calling the define function.

import { html, css, LitElement } from 'lit';
import {customElement} from 'lit/decorators.js';

@customElement('my-component')
export default class MyComponent extends LitElement {...}

Check out the customElement documentation for more information on this Class decorator factory feature.

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