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Documented useDefineForClassFields #479

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11 changes: 11 additions & 0 deletions packages/lit-dev-content/site/docs/components/decorators.md
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Expand Up @@ -79,6 +79,17 @@ To use decorators with [TypeScript](https://www.typescriptlang.org/docs/handbook

Enabling `emitDecoratorMetadata` is not required and not recommended.

For TypeScript 3.7 and above a new flag `useDefineForClassFields` is incompatible with property decorators, and for 4.3 when the `target` is `es2020` or higher it defaults to true.

There are two ways to work around this incompatability: either add a compiler option to force it off:

```json
"experimentalDecorators": true,
"useDefineForClassFields": false,
```

Alternatively `useDefineForClassFields` _can_ be used if every decorator annotated property uses `declare`.

### Using decorators with Babel { #decorators-babel }

If you're compiling JavaScript with [Babel](https://babeljs.io/docs/en/), you can enable decorators by adding the following plugins:
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