spawn-benchmark

benchmark.js

#!/usr/bin/env node

const spawnAsync = require("@expo/spawn-async");
const assert = require("assert");
const childProcess = require("child_process");
const crossSpawn = require("cross-spawn");

function profileExecSync() {
  console.time("execSync");
  const output = childProcess.execSync("xcodebuild -version").toString();
  console.timeEnd("execSync");
  assert(output.includes("Build version"));
}

function profileExecFileSync() {
  console.time("execFileSync");
  const output = childProcess
    .execFileSync("xcodebuild", ["-version"])
    .toString();
  console.timeEnd("execFileSync");
  assert(output.includes("Build version"));
}

function profileSpawnSync() {
  console.time("spawnSync");
  const output = childProcess
    .spawnSync("xcodebuild", ["-version"])
    .stdout.toString();
  console.timeEnd("spawnSync");
  assert(output.includes("Build version"));
}

function profileCrossSpawn() {
  return new Promise((resolve, reject) => {
    console.time("cross-spawn");

    let output = "";
    const child = crossSpawn
      .spawn("xcodebuild", ["-version"])
      .once("close", () => {
        console.timeEnd("cross-spawn");
        if (output.includes("Build version")) {
          resolve();
        } else {
          reject(new Error("invalid output"));
        }
      });

    child.stdout.on("data", (buffer) => {
      output += buffer.toString();
    });
  });
}

async function profileSpawnAsync() {
  console.time("@expo/spawn-async");
  const output = (await spawnAsync("xcodebuild", ["-version"])).stdout;
  console.timeEnd("@expo/spawn-async");
  assert(output.includes("Build version"));
}

async function profile() {
  for (let i = 0; i < 10; i++) {
    profileExecSync();
  }
  for (let i = 0; i < 10; i++) {
    profileExecFileSync();
  }
  for (let i = 0; i < 10; i++) {
    profileSpawnSync();
  }
  for (let i = 0; i < 10; i++) {
    await profileCrossSpawn();
  }
  for (let i = 0; i < 10; i++) {
    await profileSpawnAsync();
  }
}

profile().catch((error) => console.error(error));

package.json

{
  "name": "spawn-benchmark",
  "version": "1.0.0",
  "bin": "benchmark.js",
  "license": "MIT",
  "dependencies": {
    "@expo/spawn-async": "^1.5.0",
    "cross-spawn": "^6.0.5"
  },
  "devDependencies": {
    "prettier": "^2.2.1"
  },
  "prettier": {}
}