old_contents: import Matcher from './matcher';
  import _ from 'lodash';
  
  class DeepEqualsMatcher extends Matcher {
      constructor(value){
          super();
          this.value = value;
      }
      matches(otherValue) {
          if (_.isNull(this.value) || _.isUndefined(this.value)) {
              return false;
          }
          return _.isEqual(this.value, otherValue);
      }
  }
  
  export {
      DeepEqualsMatcher
  };
  export default (valueToMatch) => new DeepEqualsMatcher(valueToMatch);
new_contents: import Matcher from './matcher';
  import _ from 'lodash';
  
  class DeepEqualsMatcher extends Matcher {
      constructor(value){
          super();
          this.value = value;
      }
      matches(otherValue) {
          if (_.isNull(this.value) || _.isUndefined(this.value)) {
              return false;
          }
          return _.isEqual(this.value, otherValue);
      }
  }
  
  export {
      DeepEqualsMatcher
  };
  export default (valueToMatch) => new DeepEqualsMatcher(valueToMatch);
  
  
subject: Add newline