code: Node createThisAliasDeclarationForFunction(String aliasName, Node functionNode) {
      return createSingleConstNameDeclaration(
          aliasName, createThis(getTypeOfThisForFunctionNode(functionNode)));
    }
docs: Creates a statement declaring a const alias for "this" to be used in the given function node.
  
  <p>e.g. `const aliasName = this;`