code: function isMemberCall({ callee }, obj, prop) {
    return callee.type === 'MemberExpression'
      && callee.object.name === obj
      && callee.property.name === prop;
  }
docs: Determines if a given node represents a call to prop on object.
  @param  {Object} node The ast node.
  @param  {string} obj  The object identity.
  @param  {string} prop The property identity.
  @return {Boolean} `true` if node represents `obj[prop]()`. `false` otherwise.