method Node.prototype.getSymbolOrThrowimport { Node } from "https://deno.land/x/fresh@1.2.0/src/dev/deps.ts"; getSymbolOrThrow(message?: string | (() => string)): SymbolGets the symbol or throws an error if it doesn't exist. Gets the symbol or throws an error if it doesn't exist. Parametersoptionalmessage: string | (() => string)ReturnsSymbol