type WritableDraft is not exported in v10

[York Yao]

🐛 Bug Report

// v9
import { WritableDraft  } from "immer/dist/types/types-external"

// v10 but not exported
import { WritableDraft  } from "immer"

Link to repro

To Reproduce

Observed behavior

Expected behavior

Environment

We only accept bug reports against the latest Immer version.

• Immer version:
• I filed this report against the latest version of Immer
• Occurs with setUseProxies(true)
• Occurs with setUseProxies(false) (ES5 only)

[York Yao]

I use Draft instead.