Set up compilation to JavaScript using Opal

1 files changed, 19 insertions, 0 deletions

diff --git a/Rakefile b/Rakefile
index aa8614e..bc86f92 100644
--- a/Rakefile
+++ b/Rakefile
@@ -22,3 +22,22 @@ begin
 rescue LoadError => e
   warn "#{e.path} is not available"
 end
+
+namespace :build do
+  desc 'Transcompile to JavaScript using Opal'
+  task :js do
+    require 'opal'
+
+    builder = Opal::Builder.new(compiler_options: {
+      dynamic_require_severity: :error,
+    })
+    builder.append_paths 'lib'
+    builder.build 'asciidoctor-interdoc-reftext'
+
+    out_file = 'js/asciidoctor-interdoc-reftext.js'
+
+    mkdir_p(File.dirname(out_file), verbose: false)
+    File.binwrite out_file, builder.to_s
+    File.binwrite "#{out_file}.map", builder.source_map
+  end
+end