fix(docs): modify import statement to type-only imports explicitly

[Enchan1207]

summary

Modified import to Type-Only Imports explicitly.

// from
import { AppType } from '.'

// to
import type { AppType } from '.'

details

In most cases, its difference is not a problem.

conditions that cause problems

If compiler option verbatimModuleSyntax is enabled, type import must be written as follows:

// A. NG
import { AppType } from '.'

// B. OK
import type { AppType } from '.'

// C. it is also OK
import { type AppType } from '.'

However, in pattern C, server-side code may be mixed into client-side .

why this happen

It is caused by rewriting rule of TypeScript.

The statement import { type AppType } from '@/module' is rewritten into import {} from '@/module'.
It means @/module will still be imported as a value after compilation.

I created the repository (Enchan1207/hono_rpc_import_style_differences) for reproducing its behavior.

The option verbatimModuleSyntax is not enabled as default, so it might be nitpick.

[yusukebe]

LGTM!

[yusukebe]

@Enchan1207

Thanks! It should only import the types. I'll merge this.