Update babel.config.js so build artifacts are compiled to ES5. #3304
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Reasons for making this change
dts-cli will utilize the babel.config.js file on build. The
targets
option for the @babel/preset-env plugin will determine what features the compiled output will target. Per babel docs:This approach will allow us to continue to write ESNext code while we can be confident RJSF users will still consume ES5 code.
Fixes #3240
Checklist
npm run test:update
to update snapshots, if needed.