run yarn build react/index,react-dom/index --type=UMD but noting
download react-16.8.0 source code and run "yarn"
follow Development Workflow
run "yarn build react/index,react-dom/index --type=UMD"
but react-16.8.0/build/node_modules/react/umd/react.development.js net::ERR_FILE_NOT_FOUND
build folder only contains facebook-www folder and react-native folder
Worked fine for me, and the rest of the team. what version of node are you using? can you share more of the error from your terminal?
node version:12.16.0,platform win10,,react 16.8.0
Try with node v10?
Please share what the terminal output is after you build as well

Yeah it doesn’t seem to be building properly here. Please try using node v10, run yarn once, and try again. We’ll work on making this work with 12 soon.
I use node 10.8.0 It work for me! thank you very much! but what the error mean in the follow picture

the same issue, also using windows10 I tried node v14.20.0, v12.22.12 and v10.24.1 and still the same for '17.0.2' branch