2-mitata-bench.mjs

import { run, bench, group, baseline } from 'mitata'
import { strictEqual } from 'node:assert'
import loadThenables from './loader.mjs'

const LONG_ARRAY_SIZE = 100_000

const thenables = await loadThenables()

group('Short array', () => {
  baseline('Promise.all', async () => {
    const [a, b] = await Promise.all([Promise.resolve(1), Promise.resolve(2)])
    strictEqual(a, 1)
    strictEqual(b, 2)
  })
  for (const thenable of thenables) {
    bench(thenable.name, async () => {
      // eslint-disable-next-line
      Array.prototype.then = thenable;

      const [a, b] = await [Promise.resolve(1), Promise.resolve(2)]
      strictEqual(a, 1)
      strictEqual(b, 2)
    })
  }
})

group('Long array', () => {
  baseline('Promise.all', async () => {
    const promises = []
    for (let i = 1; i <= LONG_ARRAY_SIZE; i++) {
      promises.push(Promise.resolve(i))
    }

    const [a, b] = await Promise.all(promises)
    strictEqual(a, 1)
    strictEqual(b, 2)
  })
  for (const thenable of thenables) {
    bench(thenable.name, async () => {
      // eslint-disable-next-line
      Array.prototype.then = thenable;

      const array = []
      for (let i = 1; i <= LONG_ARRAY_SIZE; i++) {
        array.push(Promise.resolve(i))
      }

      const [a, b] = await array
      strictEqual(a, 1)
      strictEqual(b, 2)
    })
  }
})

await run()