Method merge

tools/isobuild/build-plugin.js:162–175

(otherSet, options = {})

  // and singlePackage.  If arch is set, skips SourceProcessors that
  // don't match it.
  merge(otherSet, options = {}) {
    const { arch } = options;
    buildmessage.assertInJob();
    otherSet.allSourceProcessors.forEach((sourceProcessor) => {
      if (! arch || sourceProcessor.relevantForArch(arch)) {
        this.addSourceProcessor(sourceProcessor);
      }
    });
    _.each(otherSet._legacyHandlers, (info, extension) => {
      const { handler, packageDisplayName, isTemplate, archMatching } = info;
      this.addLegacyHandler(
        {extension, handler, packageDisplayName, isTemplate, archMatching});
    });
  }

  // Note: Only returns SourceProcessors, not legacy handlers.
  getByExtension(extension) {