code: function isExpectedUrl (node) {
        return Boolean(
          node &&
          node.type === 'Literal' &&
          typeof node.value === 'string' &&
          (
            expectedUrl === undefined ||
            node.value === expectedUrl
          )
        );
      }
docs: Check whether a given node is the expected URL.
  @param {Node} node The node of property value to check.
  @returns {boolean} `true` if the node is the expected URL.