wro4j-extensions/src/main/java/ro/isdc/wro/extensions/processor/support/packer/PackerJs.java
private RhinoScriptBuilder initScriptBuilder() {
    try {
      return RhinoScriptBuilder.newChain().evaluateChain(getStreamForBase2(), "base2.min.js").evaluateChain(
          getStreamForPacker(), "packer.min.js");
    } catch (final IOException ex) {
      throw new IllegalStateException("Failed reading init script", ex);
    }
  }
private RhinoScriptBuilder initScriptBuilder() {
    try {
      return RhinoScriptBuilder.newChain().evaluateChain(getStreamForBase2(), "base2.min.js").evaluateChain(
          getStreamForPacker(), "packer.min.js");
    } catch (final IOException ex) {
      throw new IllegalStateException("Failed reading init script", ex);
    }
  }
Initialize script builder for evaluation.