method Decorator.prototype.addArgumentimport { Decorator } from "https://deno.land/x/ts_morph@15.1.0/ts_morph.d.ts"; addArgument(argumentText: string | WriterFunction): Node<ts.Node>Adds an argument. Adds an argument. ParametersargumentText: string | WriterFunction Argument text. ReturnsNode<ts.Node>