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Mention that updating to TypeScript 5.2 is necessary in the upgrade guide #1380

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Oct 29, 2024
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Mention that updating to TypeScript 5.2 is necessary in the upgrade guide #1380

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3 changes: 2 additions & 1 deletion packages/lit-dev-content/site/docs/v3/releases/upgrade.md
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Expand Up @@ -23,8 +23,9 @@ Lit 3.0 has very few breaking changes from Lit 2.x:
- APIs marked deprecated in Lit 2.x releases have been removed.
- SSR hydration support modules have moved to the `@lit-labs/ssr-client` package.
- Type only: Type of `ReactiveElement`'s `renderRoot` and `createRenderRoot()` have been updated.
- Decorator behavior has been unified between TypeScript experimental decorators and standard decorators.
- Support was removed for Babel decorators version "2018-09".
- Decorator behavior has been unified between TypeScript experimental decorators and standard decorators.
- As a consequence, if you use TypeScript you'll need to upgrade to at least TypeScript v5.2, to get the updated types for both kinds of decorators.
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For the vast majority of users there should be no required code changes to upgrade from Lit 2 to Lit 3. Most apps and libraries should be able to extend their npm version ranges to include both 2.x and 3.x, like `"^2.7.0 || ^3.0.0"`.

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