transform-react-jsx: pragma has been set but pragmaFrag has not been set

[kentcdodds]

Current behavior:

If you set the /** @jsx jsx */ as instructed in the docs, and then try to use a React Fragment, you get the following error:

transform-react-jsx: pragma has been set but pragmaFrag has not been set

To reproduce:

1. npm create react-app pragma-issue
2. npm install @emotion/core
3. add /** @jsx jsx */ and then import {jsx} from '@emotion/core' to src/index.js
4. npm run build

You'll get the error.

Add /** @jsxFrag React.Fragment */ to the top of the file and the error goes away.

Expected behavior:

This is a new error. Maybe it's something that babel can fix so we don't have to add /** @jsxFrag React.Fragment */ to every file...

Environment information:

• react version: latest
• emotion version: latest

[kentcdodds]

Just checked and babel's restoring the original behavior: https://twitter.com/existentialism/status/1242180403928195075