Class: BabelSchmoozeSprockets::BabelProcessor

Inherits:
Object
  • Object
show all
Defined in:
lib/babel-schmooze-sprockets/babel_processor.rb

Constant Summary collapse

DEFAULT_PRESETS = 
%w[
  es2015
].freeze
DEFAULT_PLUGINS = 
%w[
  transform-async-to-generator
  transform-es2015-modules-amd
  transform-es3-member-expression-literals
  transform-es3-property-literals
  transform-function-bind
].freeze
DEFAULT_BABEL_OPTIONS = 
{
  presets: DEFAULT_PRESETS,
  plugins: DEFAULT_PLUGINS
}.freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ BabelProcessor

Returns a new instance of BabelProcessor.



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# File 'lib/babel-schmooze-sprockets/babel_processor.rb', line 31

def initialize(options)
  @options = options

  @cache_key = [
    self.class.name,
    Babel.new(@options.fetch(:root_dir)).version,
    VERSION,
    @options
  ].freeze
end

Class Method Details

.call(input) ⇒ Object 



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# File 'lib/babel-schmooze-sprockets/babel_processor.rb', line 27

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

.instance ⇒ Object 



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# File 'lib/babel-schmooze-sprockets/babel_processor.rb', line 20

def self.instance
  @instance ||= BabelProcessor.new(
    root_dir: File.expand_path("#{__dir__}/../.."),
    options: BabelProcessor::DEFAULT_BABEL_OPTIONS
  )
end

Instance Method Details

#call(input) ⇒ Object 



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# File 'lib/babel-schmooze-sprockets/babel_processor.rb', line 42

def call(input)
  data = input[:data]

  result = input[:cache].fetch(@cache_key + [input[:filename]] + [data]) do
    options = {
      moduleIds: true,
      sourceRoot: input[:load_path],
      moduleRoot: nil,
      filename: input[:filename],
      filenameRelative: Sprockets::PathUtils.split_subpath(input[:load_path], input[:filename]),
      sourceFileName: input[:source_path],
      sourceMaps: true,
      ast: false
    }.merge(@options.fetch(:options))

    if options[:moduleIds] && options[:moduleRoot]
      options[:moduleId] ||= File.join(options[:moduleRoot], input[:name])
    elsif options[:moduleIds]
      options[:moduleId] ||= input[:name]
    end

    Babel
      .new(@options.fetch(:root_dir))
      .transform(data, options)
  end

  map = Sprockets::SourceMapUtils.decode_json_source_map(JSON.generate(result["map"]))
  map = Sprockets::SourceMapUtils.combine_source_maps(input[:metadata][:map], map["mappings"])

  {data: result["code"], map: map}
end