import { matches } from "https://deno.land/x/embassyd_sdk@v0.3.3.0.4/dependencies.ts";
const { Parser } = matches;
This is a constructor helper that can use a predicate tester in the form of a guard function, and will return a parser that will only parse if the predicate returns true. https://www.typescriptlang.org/docs/handbook/advanced-types.html#type-guards-and-differentiating-types
Type Parameters
B extends A