lit-element-starter-ts | Sample component project using LitElement | Web Framework library
kandi X-RAY | lit-element-starter-ts Summary
kandi X-RAY | lit-element-starter-ts Summary
Sample component project using LitElement with TypeScript
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QUESTION
The Typescript Lit Element starter project includes this global interface declaration at the bottom of the example element:
...ANSWER
Answered 2020-Dec-18 at 12:30Is that necessary?
No, this declaration is not necessary for your LitElement based custom element to work.
What is it used for?
This is a feature of TypeScript and not specific to LitElement.
This declaration helps TypeScript to provide strong typing when interacting with DOM APIs. The JavaScript DOM API of course does not know or care about types, but TypeScript does. With this mechanism you can add the type of your custom elements to the DOM APIs.
An example might illustrate this better. Assuming this very simple custom element:
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