Webpacker not compiling live

Question

I have my Rails apps running and have Webpacker installed. I have the webpack-dev-server running as a Docker container but it doesn;t seem to be responding to changes in my files and recompiling.

Can anyone check my config to see if they can spot anything wrong?

docker-compose.yml:

version: '3.7'

services:
  app:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - 3000:3000
      - 35729:35729
      - 5000:5000
    env_file:
      - '.env'
    volumes:
      - .:/app
      - type: tmpfs
        target: /app/tmp/pids/
    depends_on:
      - database
      - elasticsearch
      - webpacker

  database:
    image: postgres:9.6-alpine
    env_file:
      - '.env'
    volumes:
      - pg-data:/var/lib/postgresql/data

  webpacker:
    build: .
    command: ./bin/webpack-dev-server
    env_file:
      - '.env'
    volumes:
      - .:/app
    ports:
      - 3035:3035

  adminer:
    image: adminer
    restart: always
    ports:
      - 8080:8080

  elasticsearch:
    image: docker.elastic.co/elasticsearch/elasticsearch-oss:6.4.1
    env_file:
      - '.env'
    volumes:
      - es-data:/usr/share/elasticsearch/data
    ports:
      - 9200:9200

volumes:
  pg-data:
  es-data:

config/webpacker.yml:

# Note: You must restart bin/webpack-dev-server for changes to take effect

default: &default
  source_path: app/webpacker
  source_entry_path: packs
  public_output_path: public/packs
  cache_path: tmp/cache/webpacker

  # Additional paths webpack should lookup modules
  # ['app/assets', 'engine/foo/app/assets']
  resolved_paths: []

  # Reload manifest.json on all requests so we reload latest compiled packs
  cache_manifest: false

  extensions:
    - .js
    - .sass
    - .scss
    - .css
    - .module.sass
    - .module.scss
    - .module.css
    - .png
    - .svg
    - .gif
    - .jpeg
    - .jpg

development:
  <<: *default
  compile: true

  # Reference: https://webpack.js.org/configuration/dev-server/
  dev_server:
    https: false
    host: webpacker
    port: 3035
    public: webpacker:3035
    hmr: false
    # 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/


test:
  <<: *default
  compile: true

  # Compile test packs to a separate directory
  public_output_path: packs-test

production:
  <<: *default

  # Production depends on precompilation of packs prior to booting for performance.
  compile: false

  # Cache manifest.json for performance
  cache_manifest: true

config/webpack/loaders/sass.js:

{
  loader: 'postcss-loader',
  options: {
    sourceMap: true,
    plugins: (loader) => [
      require('postcss-cssnext')({
        features: {
          customProperties: {
            warnings: false
          }
        }
      })
    ]
  }
}

My files are in this structure:

I hope you are able to help me as this is stopping my development of this app.

Thanks

Answer 1

For code reloading by default webpack dev server relies on fsevents, which are not delivered inside docker.

For running inside docker you can switch to polling changes, in webpacker.yml:

dev_server:
  ...
  watch_options:
    poll: 1000
    aggregate_timeout: 100

Also try installing latest version of docker, there're reports that fsevents are working in it.