49 lines
1.8 KiB
Ruby
49 lines
1.8 KiB
Ruby
require "sprockets/digest_utils"
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require "sprockets/uglifier_compressor"
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module Sprockets
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class UglifierWithSourceMapsCompressor < Sprockets::UglifierCompressor
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def call(input)
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data = input.fetch(:data) # Non-Uglified contents of the JS file
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name = input.fetch(:name) # name of the to-be-compressed JS file.
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@uglifier ||= Autoload::Uglifier.new(@options.merge({ harmony: true }))
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compressed_data, sourcemap_json = @uglifier.compile_with_map(input[:data])
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# Update source map according to the version 3 spec: https://sourcemaps.info/spec.html
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sourcemap = JSON.parse(sourcemap_json)
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sourcemap["sources"] = ["#{name}.js"]
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sourcemap["sourceRoot"] = ::Rails.application.config.assets.prefix
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sourcemap["sourcesContent"] = [data]
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sourcemap_json = sourcemap.to_json
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sourcemap_filename = File.join(
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::Rails.application.config.assets.prefix,
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"#{name}-#{digest(sourcemap_json)}.js.map",
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)
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sourcemap_path = File.join(::Rails.public_path, sourcemap_filename)
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sourcemap_url = filename_to_url(sourcemap_filename)
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FileUtils.mkdir_p File.dirname(sourcemap_path)
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File.open(sourcemap_path, "w") { |f| f.write sourcemap_json }
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# Add the source map URL to the compressed JS file.
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compressed_data.concat "\n//# sourceMappingURL=#{sourcemap_url}\n"
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end
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def filename_to_url(filename)
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url_root = ::Rails.application.config.assets.source_maps_domain
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File.join url_root.to_s, filename
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end
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def digest(io)
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Sprockets::DigestUtils.pack_hexdigest Sprockets::DigestUtils.digest(io)
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end
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end
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end
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Sprockets.register_compressor(
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"application/javascript",
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:uglify_with_source_maps,
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Sprockets::UglifierWithSourceMapsCompressor,
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)
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