FuckBrain

import { Interpreter } from "https://deno.land/x/fuckbrain/mod.ts";

const code = `++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.`;
const debug = false;
const sizeLimit = 255;
const onInput = (): string | number => "R";
const interpreter = new Interpreter({
  onInput, debug, sizeLimit
});

await interpreter.execute(code);
console.log(interpreter.outputs.join("")); //Hello World!