instrumental/lib/webpacker/manifest_extensions.rb

# frozen_string_literal: true

module Webpacker::ManifestExtensions
  def lookup(name, pack_type = {})
    asset = super

    if pack_type[:with_integrity] && asset.respond_to?(:dig)
      [asset['src'], asset['integrity']]
    elsif asset.respond_to?(:dig)
      asset['src']
    else
      asset
    end
  end
end

Webpacker::Manifest.prepend(Webpacker::ManifestExtensions)