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docs: typescript tips for using Type-Only Imports and Export #6260

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Dec 25, 2021
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docs: typescript tips for using Type-Only Imports and Export #6260

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docs: typescript tips for using Type-Only Imports and Export
ygj6 Dec 25, 2021
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chore: type
ygj6 Dec 25, 2021
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7 changes: 7 additions & 0 deletions docs/guide/features.md
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Expand Up @@ -34,6 +34,13 @@ Vite only performs transpilation on `.ts` files and does **NOT** perform type ch

Vite uses [esbuild](https://github.com/evanw/esbuild) to transpile TypeScript into JavaScript which is about 20~30x faster than vanilla `tsc`, and HMR updates can reflect in the browser in under 50ms.

Use the [Type-Only Imports and Export](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-8.html#type-only-imports-and-export) syntax to avoid potential problems like type-only imports being incorrectly bundled. for example:

```ts
import type { T } from 'only/types'
export type { T }
```

### TypeScript Compiler Options

Some configuration fields under `compilerOptions` in `tsconfig.json` require special attention.
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