Class: SprocketsTerserWithSourceMaps::Compressor

Inherits:
Terser::Compressor
  • Object
show all
Defined in:
lib/sprockets_terser_with_source_maps/compressor.rb

Overview

Custom compressor to generate sourcemaps

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Compressor

Returns a new instance of Compressor.



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# File 'lib/sprockets_terser_with_source_maps/compressor.rb', line 12

def initialize(options = {})
  @logger = Logger.new($stdout)
  @logger.level = Logger::INFO
  @options = options.merge(Rails.application.config.assets.terser.to_h)
  super(@options)
end

Instance Attribute Details

#logger ⇒ Object

Returns the value of attribute logger.



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# File 'lib/sprockets_terser_with_source_maps/compressor.rb', line 10

def logger
  @logger
end

Instance Method Details

#call(input) ⇒ Object 



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# File 'lib/sprockets_terser_with_source_maps/compressor.rb', line 19

def call(input)
  input_options = { source_map: { filename: input[:filename] } }

  data = input.fetch(:data)
  name = input.fetch(:name)

  compressed_js, map = @terser.compile_with_map(data, input_options)

  sourcemap = JSON.parse(map)

  if Rails.application.config.assets.sourcemaps_embed_source
    sourcemap['sourcesContent'] = [data]
  else
    # Generate uncompressed asset
    uncompressed_url = generate_asset_file(name, data, Rails.application.config.assets.uncompressed_prefix)

    sourcemap['sources'] = [uncompressed_url]
  end

  sourcemap['file'] = "#{name}.js"
  sourcemap_json = sourcemap.to_json

  # Generate sourcemap file
  sourcemap_url = generate_asset_file(
    name, sourcemap_json,
    Rails.application.config.assets.sourcemaps_prefix,
    'js.map'
  )

  js = compressed_js.concat "\n//# sourceMappingURL=#{sourcemap_url}\n"

  { data: js, map: sourcemap }
end