memoryLeakTest.js

memoryLeakTest.js

// RUN WITH
// node --expose_gc memoryLeakTest.js

class A {
  async b() {
    return { foo: "bar".repeat(1000) };
  }

  async c() {
    return Promise.resolve({ foo: "bar".repeat(1000) });
  }
}

const a = new A();

(async () => {
  for (let i = 0; i < 10000000; i++) {
    await a.b();
  }
  global.gc();
  await sleep();
  console.log("GC\nb() results:\n", process.memoryUsage());


  for (let i = 0; i < 10000000; i++) {
    await a.c();
  }
  global.gc();
  await sleep();
  console.log("GC\nc() results:\n", process.memoryUsage());


  for (let i = 0; i < 10000000; i++) {
    await a.b();
  }
  global.gc();
  await sleep();
  console.log("GC\nb() results:\n", process.memoryUsage());
})();

function sleep() {
    return new Promise((resolve) => setTimeout(resolve, 0));
}