ByePastHub opened a new issue #15815:
URL: https://github.com/apache/superset/issues/15815
Can't start superset-frontend project(Nullish coalescing operator)
### Expected results
```
| const initialState = {
> pageSize: initialPageSize ?? DEFAULT_PAGE_SIZE,
| pageIndex: initialPageIndex ?? 0,
| sortBy: initialSortBy };
```
### Actual results
Compilation failed
#### Screenshots
<img width="1358" alt="iShot2021-07-21 17 08 01"
src="https://user-images.githubusercontent.com/40738560/126463166-b74970ee-9823-4a30-9af1-e4facb051f6c.png";>
#### How to reproduce the bug
1. git clone project(master)
2. In the superset-frontend directory
3. yarn install
4. npm run dev
### Environment
(please complete the following information):
- superset version: `I don't know what version it is，2021-7-21 master branch`
- python version: `2.7.16`
- node.js version: `v14.16.0`
- platform `macOS Big Sur 11.4`
### Checklist
Make sure to follow these steps before submitting your issue - thank you!
- [ ] I have checked the superset logs for python stacktraces and included
it here as text if there are any.
- [ ] I have reproduced the issue with at least the latest released version
of superset.
- [ ] I have checked the issue tracker for the same issue and I haven't
found one similar.
### Additional context
Add any other context about the problem here.
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