Class: SprocketsTerserWithSourceMaps::Compressor

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

Overview

Custom compressor to generate sourcemaps

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ 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[:comments] ||= :none
  @options = options.merge(Rails.application.config.assets.terser.to_h)
  @cache_key = -"Terser:#{Autoload::Terser::VERSION}:#{VERSION}:#{::Sprockets::DigestUtils.digest(@options)}"
  @terser = Autoload::Terser.new(@options)
end

Instance Attribute Details

#cache_key ⇒ Object (readonly)

Returns the value of attribute cache_key.



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# File 'lib/sprockets_terser_with_source_maps/compressor.rb', line 34

def cache_key
  @cache_key
end

#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

Class Method Details

.cache_key ⇒ Object 



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# File 'lib/sprockets_terser_with_source_maps/compressor.rb', line 30

def self.cache_key
  instance.cache_key
end

.call(input) ⇒ Object 



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# File 'lib/sprockets_terser_with_source_maps/compressor.rb', line 26

def self.call(input)
  instance.call(input)
end

.instance ⇒ Object 



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# File 'lib/sprockets_terser_with_source_maps/compressor.rb', line 22

def self.instance
  @instance ||= new
end

Instance Method Details

#call(input) ⇒ Object 



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# File 'lib/sprockets_terser_with_source_maps/compressor.rb', line 36

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