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Unsupported: TypeScript 3.8 Syntax: import type

See original GitHub issue

Bug report

Describe the bug

Using the import type syntax from TypeScript 3.8 causes a build failure with next.js

To Reproduce

git clone https://github.com/balupton/nextjs-typescript-3.8-syntax (applies this changeset https://github.com/balupton/nextjs-typescript-3.8-syntax/commit/53a7fc6bffa8f030053cd3109ae11715d079f07c to the with-javascript next.js example)
cd nextjs-typescript-3.8-syntax
yarn install
yarn build

yarn run v1.22.4
$ next build
Creating an optimized production build  

Failed to compile.

/Users/balupton/Projects/experiments/nextjs-typescript-3.8-syntax/my-app/pages/index.tsx
ERROR in /Users/balupton/Projects/experiments/nextjs-typescript-3.8-syntax/my-app/pages/index.tsx(3,13):
3:13 '=' expected.
    1 | import Link from "next/link";
    2 | import Layout from "../components/Layout";
  > 3 | import type { AllKeys } from "simplytyped";
      |             ^
    4 | 
    5 | const IndexPage = () => (
    6 |   <Layout title="Home | Next.js + TypeScript Example">


> Build error occurred
Error: > Build failed because of webpack errors
    at build (/Users/balupton/Projects/experiments/nextjs-typescript-3.8-syntax/my-app/node_modules/next/dist/build/index.js:13:900)
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

Expected behavior

It to work fine

Screenshots

System information

OS: [e.g. macOS, Windows] Darwin bevrymemacbook.local 19.4.0 Darwin Kernel Version 19.4.0: Wed Mar 4 22:28:40 PST 2020; root:xnu-6153.101.6~15/RELEASE_X86_64 x86_64
Browser (if applies) [e.g. chrome, safari] n/a
Version of Next.js: [e.g. 6.0.2] 9.3.5 - https://github.com/balupton/nextjs-typescript-3.8-syntax/blob/master/yarn.lock#L3413-L3414
Version of Node.js: [e.g. 10.10.0] 13.12.0