We had some difficulties with configurations of Webpacker and Docker for autoreload.
After some issue this configurations seems work very well.

# config/webpacker.yml development: <<: *default host: webpacker hmr: true compile: true

Reference: https://webpack.js.org/configuration/dev-server/

dev_server: https: false host: webpacker port: 3035 public: localhost:3035 hmr: true # Inline should be set to true if using HMR inline: true overlay: true compress: true disable_host_check: true use_local_ip: false quiet: false headers: 'Access-Control-Allow-Origin': '*' watch_options: ignored: /node_modules/