Optional chaining (?.) in dist/plugin.cjs makes build project crash while in Node.js version lower than 14

[xliez]

Describe the bug
Optional chaining (?.) in dist/plugin.cjs make build crash while in Node.js version lower than 14

To Reproduce
Steps to reproduce the behavior:

1. Clone repository '...'
2. Run '....'
3. See error

Expected behavior
Build pass

Screenshots

Additional context
Add any other context about the problem here.

[harlan-zw]

Hey @xliez

Thanks for reporting the issue! Have updated the build configuration for an es2019 target which should fix this.

If you have issues with 1.7.2 can you please let me know :)