in lib/react/server_rendering/webpacker_manifest_container.rb [40:53]
def find_asset(logical_path)
asset_path = Webpacker.manifest.lookup(logical_path).to_s
if Webpacker.dev_server.running?
ds = Webpacker.dev_server
asset_path.slice!("#{ds.protocol}://#{ds.host_with_port}")
dev_server_asset = URI.open("#{ds.protocol}://#{ds.host_with_port}#{asset_path}").read
dev_server_asset.sub!(CLIENT_REQUIRE, '//\0')
dev_server_asset
else
File.read(file_path(logical_path))
end
end