create-react-app error import type * as PrettyFormat from './types' in pretty-format

Question

it\'s a fresh install of cra with typescript template running on node 13.11.0 it gives me error when try to run npm start

TypeScript error in D:/Projects/persona         


        

Answer 1

Update

Thanks for marcelo-waisman's post.

Upgrading Typescript to > 3.8.0 solved this.

If we follow the documentation tightly...

yarn add typescript @types/node @types/react @types/react-dom @types/jest

... we should have installed TypeScript with the latest version, rather than the local-global version which may still below 3.8.0.

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I found some clues. Maybe it's worth an opening an issue.

It's related to the package pretty-format and its type in create-react-app. We can find the source here: pretty-format/src/index.ts

import style = require('ansi-styles');
import type * as PrettyFormat from './types';

From the commit history, we can see there is a related Pull Request from two days ago, which changed this part from...

import * as PrettyFormat from './types';

... to...

import type * as PrettyFormat from './types';

This seems to be the cause of the error.