Starting the proxy for development with a react server fails.

[potamides]

Starting the proxy for development with a react server fails with the following error:

(node:152790) ExperimentalWarning: --experimental-loader is an experimental feature. This feature could change at any time                                      
(Use `node --trace-warnings ...` to show where the warning was created)                                                                                         
TypeError [ERR_INVALID_RETURN_PROPERTY_VALUE]: Expected string to be returned for the "format" from the "loader getFormat" function but got type object.        
    at Loader.getFormat (internal/modules/esm/loader.js:110:13)                                                                                                 
    at Loader.getModuleJob (internal/modules/esm/loader.js:230:20)                                                                                              
    at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:53:21)                                                                                        
    at async Promise.all (index 2)                                                                                                                              
    at link (internal/modules/esm/module_job.js:58:9)                                                                                                           
error Command failed with exit code 1.                                          
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

This problem seems to have been introduced with node 14.13.1. Older versions work fine, so the current workaround is to downgrade to 14.13.0. More information can be found here.

[ahbnr]

Fixed by f351447430af32d32e4b1ec1d543d5f4c3f0af18

Node downgrade not necessary.