Class: SprocketsEsbuild::TransformerBase

Inherits:
Object
  • Object
show all
Includes:
Sprockets
Defined in:
lib/sprockets-esbuild/transformers.rb

Direct Known Subclasses

JsxTransformer, TsTransformer, TsxTransformer

Constant Summary collapse

ESBUILD = 
[File.expand_path('../../exe/esbuild', __dir__)]

Instance Method Summary collapse

Instance Method Details

#cache_key ⇒ Object 



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# File 'lib/sprockets-esbuild/transformers.rb', line 22

def cache_key
  @cache_key ||= "#{self.class.name}::#{VERSION}".freeze
end

#call(input) ⇒ Object 



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# File 'lib/sprockets-esbuild/transformers.rb', line 26

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

  input[:cache].fetch([cache_key, data]) do

    out, err, status = Open3.capture3(*ESBUILD, '--sourcemap',
      "--sourcefile=#{input[:filename]}", "--loader=#{loader}",
      stdin_data: input[:data])

    match = out.match %r{^//# sourceMappingURL=data:application/json;base64,(.*)\s*}

    if match
      # extract sourcemap from output and then format and combine it
      out[match.begin(0)..match.end(0)] = ''
      map = JSON.parse(Base64.decode64(match[1]))
      map = SourceMapUtils.format_source_map(map, input)
      map = SourceMapUtils.combine_source_maps(input[:metadata][:map], map)
    else
      map = nil
    end

    if status.success? and err.empty?
      if map
        { data: out, map: map }
      else
        out
      end
    else
      raise Error, "esbuild exit status=#{status.exitstatus}\n#{err}"
    end
  end
end