Run below on Linux or Mac (works on Windows too, however you may need to slightly modify some commands, e.g. change wget to curl.exe -O):

git clone https://github.com/rustdesk/rustdesk
cd rustdesk/flutter/web/js

# install protoc first http://google.github.io/proto-lens/installing-protoc.html
npm install ts-proto
# only works with vite<=2.8, see: https://github.com/vitejs/vite/blob/main/docs/guide/build.md#chunking-strategy
yarn build

cd ..

# about details of yuv converter, check this https://github.com/rustdesk/rustdesk/issues/364#issuecomment-1023562050
wget https://github.com/rustdesk/doc.rustdesk.com/releases/download/console/web_deps.tar.gz
# decompress to the current directory
tar xzf web_deps.tar.gz

cd ..

# Good Luck!
flutter run -d chrome

Currently, yuv converter and vp9 are the bottleneck