Run a pegjs grammar on an input without compiling it first

runpeg

#!/usr/bin/env node

const pegjs = require("pegjs");
const fs = require("fs");
const file = fs.readFileSync(process.argv[2], "utf-8");
const parser = pegjs.generate(file);
const input = fs.readFileSync(0, "utf-8");
console.log(parser.parse(input));