swc/crates/swc_ecma_minifier/scripts/_/reduce/compare.js

#!/usr/bin/env node

const { readFileSync } = require("fs");
const { parse } = require("@babel/parser");
const { notDeepEqual } = require("assert");

let [ast1, ast2] = process.argv
    .slice(2) // skip node executable and script filename
    .map((file) => readFileSync(file, "utf-8")) // read given files as strings
    .map((code) => {
        // console.log(code);
        return parse(code);
    }); // parse into ASTs

notDeepEqual(ast1, ast2); // ensure they're still not equal