The ability to attach attrs when embedding widgets

script/test_hbs_compiler.rb

@@ -0,0 +1,28 @@
+template = <<~HBS
+  {{attach widget="widget-name" attrs=attrs}}
+  {{#if state.category}}
+    {{attach widget="category-display" attrs=(hash category=state.category)}}
+  {{/if}}
+HBS
+
+ctx = MiniRacer::Context.new(timeout: 15000)
+ctx.eval("var self = this; #{File.read("#{Rails.root}/vendor/assets/javascripts/babel.js")}")
+ctx.eval(File.read(Ember::Source.bundled_path_for('ember-template-compiler.js')))
+ctx.eval("module = {}; exports = {};");
+ctx.attach("rails.logger.info", proc { |err| puts(err.to_s) })
+ctx.attach("rails.logger.error", proc { |err| puts(err.to_s) })
+ctx.eval <<JS
+console = {
+  prefix: "",
+  log: function(msg){ rails.logger.info(console.prefix + msg); },
+  error: function(msg){ rails.logger.error(console.prefix + msg); }
+}
+
+JS
+source = File.read("#{Rails.root}/lib/javascripts/widget-hbs-compiler.js.es6")
+ctx.eval(source)
+
+js_source = ::JSON.generate(template, quirks_mode: true)
+
+puts ctx.eval("exports.compile(#{js_source})");
+