code: function initMixinFile(mixins, buildManager, file) {
      mixins && mixins.forEach(modulePath => {
          let {resolvedModIds: cacheResolveModIds} = file;
          let cacheInfo = cacheResolveModIds[modulePath];
          let mixinFile = cacheInfo && cacheInfo.file;
          if (mixinFile && !mixinFile.isBehavior) {
              mixinFile.isBehavior = true;
          }
      });
  }
docs: Initialize the mixin(Behavior) file
  
  @inner
  @param {Array.<string>} mixins the mixin file paths
  @param {Object} buildManager the build manager
  @param {Object} file the file that refers the mixin files