plugins:
  # Convert modern CSS into something most browsers can understand
  # https://github.com/csstools/postcss-preset-env
  postcss-preset-env:
    # Polyfill CSS features
    # https://github.com/csstools/postcss-preset-env#stage
    #
    # List of features with levels: https://cssdb.org/
    stage: 0

    # Define polyfills based on browsers you are supporting
    # https://github.com/csstools/postcss-preset-env#browsers
    browsers:
      - 'last 2 versions'
      - '> 1%'

    # Instruct all plugins to omit pre-polyfilled CSS
    # https://github.com/csstools/postcss-preset-env#preserve
    preserve: false

    # Enable or disable specific polyfills
    # https://github.com/csstools/postcss-preset-env#features
    #
    # List of available plugins
    # https://github.com/csstools/postcss-preset-env/blob/master/src/lib/plugins-by-id.js
    features:
      # Modify colors using the color-mod() function in CSS
      # https://github.com/jonathantneal/postcss-color-mod-function
      color-mod-function: {}

  # Nested rules unwrapper
  # https://github.com/postcss/postcss-nested
  #
  # As you know 'postcss-preset-env' plugin has an ability to process
  # 'postcss-nesting' feature but it does not work with BEM
  # Report: https://github.com/csstools/postcss-preset-env/issues/40
  postcss-nested: {}

  # Compression tool
  # https://github.com/cssnano/cssnano
  cssnano: {}