method Node.isAbstractableimport { Node } from "https://dotland.deno.dev/x/fresh@1.7.3/src/dev/deps.ts"; isAbstractable<T extends Node>(node: T | undefined): node is AbstractableNode & AbstractableNodeExtensionType & TGets if the node is an AbstractableNode. Gets if the node is an AbstractableNode. Type ParametersT extends NodeParametersnode: T | undefinedReturnsnode is AbstractableNode & AbstractableNodeExtensionType & T