@import scalajs.html.jsScript

@(projectName: String,
  assets: String => String,
  resourceExists: String => Boolean,
  htmlAttributes: Html = Html("")
)

@defining(s"${projectName.toLowerCase}") { name =>
  @Seq(s"$name-opt-library.js", s"$name-fastopt-library.js").find(resourceExists).map(name => jsScript(assets(name), htmlAttributes))
}
<script language="JavaScript">
var exports = window;
exports.require = window["ScalaJSBundlerLibrary"].require;
</script>
@defining(s"${projectName.toLowerCase}") { name =>
  @Seq(s"$name-opt.js", s"$name-fastopt.js").find(resourceExists).map(name => jsScript(assets(name), htmlAttributes))
}