index.js

import Benchmark from 'benchmark';
import esotope from 'esotope';
import * as escodegen from '../src/escodegen-node.js';
import old from './old.cjs';
import asts from './asts.js';

function cycle(codegen) {
    for (var i = 0; i < asts.length; i++)
        codegen.generate(asts[i]);
}

new Benchmark.Suite()
    .add('esotope', function () {
        cycle(esotope);
    })

    .add('escodegen', function () {
        cycle(escodegen);
    })

    .add('old', function () {
        cycle(old);
    })

    .on('start', function () {
        console.log('Benchmarking...');
    })

    .on('cycle', function (event) {
        console.log(event.target.toString());
    })

    .on('complete', function () {
        console.log(`Fastest is ${this.filter('fastest').map('name')}`);

        console.log('esotope is x' + (this[0].hz / this[1].hz).toFixed(2) + ' times faster vs escodegen.');
    })

    .run();