Contents

require 'uri'

module SewingKit
  module Webpack
    # Webpack manifest loading, caching & entry point retrieval
    class Manifest
      # Raised if we can't read our webpack manifest for whatever reason
      class ManifestLoadError < StandardError
        def initialize(message, orig)
          super "#{message} (original error #{orig})"
        end
      end

      # Raised if a supplied entry point does not exist in the webpack manifest
      class EntryPointMissingError < StandardError
      end

      class << self
        # :nodoc:
        def asset_paths(source)
          paths = manifest[source]
          if paths
            paths
          else
            raise EntryPointMissingError, "Can't find entry point '#{source}' in webpack manifest"
          end
        end

        def manifest
          if ::Rails.env.production?
            # Cache at class level, as JSON loading/parsing can be expensive.
            @manifest ||= load_manifest
          else
            # Cache if we're outside of production; manifest may change.
            load_manifest
          end
        end

        private

        def manifest_bundled?
          !manifest["errors"].any? { |error| error.include? "Module build failed" }
        end

        def load_manifest
          data = load_static_manifest
          JSON.parse(data)
        end

        def load_static_manifest
          File.read(static_manifest_path)
        rescue => e
          raise ManifestLoadError.new("Could not load compiled manifest from #{static_manifest_path} - have you run `rake sewing_kit:compile`?", e)
        end

        def static_manifest_path
          ::Rails.root.join(
            ::Rails.configuration.sewing_kit.webpack.manifest_dir,
            ::Rails.configuration.sewing_kit.webpack.manifest_filename
          )
        end
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
sewing_kit-0.4.6	lib/sewing_kit/webpack/manifest.rb