bench.mjs

import Benchmark from "benchmark";
import baseline from "@babel-baseline/parser";
import current from "@babel/parser";
import { report } from "../../util.mjs";

const suite = new Benchmark.Suite();
function createInput(length) {
  return "type A = " + "| (x) => void".repeat(length);
}
function benchCases(name, implementation, options) {
  for (const length of [256, 512, 1024, 2048]) {
    const input = createInput(length);
    suite.add(`${name} ${length} arrow function types`, () => {
      implementation.parse(input, options);
    });
  }
}

benchCases("baseline", baseline, { plugins: ["flow"] });
benchCases("current", current, { plugins: ["flow"] });

suite.on("cycle", report).run();