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By default, the Sprockets DirectiveProcessor introduces a newline between possible 'header' comments and the rest of the JS file. This causes sourcemaps to be offset by 1 line, and therefore breaks browser tooling. We know that Ember-Cli assets do not use Sprockets directives, so we can totally bypass the DirectiveProcessor for those files. We're using v3 of Sprockets, which is no longer supported - upstreaming a fix will be difficult. Long term, we intend to move away from sprockets.
52 lines
1.9 KiB
Ruby
52 lines
1.9 KiB
Ruby
# frozen_string_literal: true
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# This contains two patches to make sprockets more tolerable in dev
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#
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# 1. Stop computing asset paths which triggers sprockets to do mountains of work
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# All our assets in dev are in the /assets folder anyway
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#
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# 2. Stop using a concatenator that does tons of work checking for semicolons when
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# when rebuilding an asset
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module FreedomPatches
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module SprocketsPatches
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def self.concat_javascript_sources(buf, source)
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if buf.bytesize > 0
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# CODE REMOVED HERE
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buf << ";" # unless string_end_with_semicolon?(buf)
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buf << "\n" # unless buf.end_with?("\n")
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end
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buf << source
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end
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if Rails.env.development? || Rails.env.test?
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Sprockets.register_bundle_metadata_reducer "application/javascript",
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:data,
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proc { +"" },
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method(:concat_javascript_sources)
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end
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end
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end
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if Rails.env.development? || Rails.env.test?
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ActiveSupport.on_load(:action_view) do
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def compute_asset_path(source, _options = {})
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"/assets/#{source}"
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end
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alias_method :public_compute_asset_path, :compute_asset_path
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end
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end
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# By default, the Sprockets DirectiveProcessor introduces a newline between possible 'header' comments
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# and the rest of the JS file. (https://github.com/rails/sprockets/blob/f4d3dae71e/lib/sprockets/directive_processor.rb#L121)
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# This causes sourcemaps to be offset by 1 line, and therefore breaks browser tooling.
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# We know that Ember-Cli assets do not use Sprockets directives, so we can totally bypass the DirectiveProcessor for those files.
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Sprockets::DirectiveProcessor.prepend(
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Module.new do
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def process_source(source)
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return source, [] if EmberCli.is_ember_cli_asset?(File.basename(@filename))
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super
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end
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end,
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)
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