webpack/benchmark/benchmark.js

const path = require("path");
const fs = require("fs");
const Benchmark = require("benchmark");
const webpack = require("../");
const fixtures = path.join(__dirname, "fixtures");
const outputPath = path.join(__dirname, "js");

const benchmarkOptions = {
	defer: true,
	onCycle: function() {
		process.stderr.write(".");
	},
	minSamples: 10
};

function runTimes(compiler, times, deferred) {
	fs.writeFileSync(path.join(fixtures, "0.js"), "module.exports = " + Math.random(), "utf-8");
	compiler.run(err => {
		if(err) throw err;
		if(times === 1)
			deferred.resolve();
		else
			runTimes(compiler, times - 1, deferred);
	});
}

const tests = {
	"normal build": [
		[0, 1, 5, 10, 50, 100, 200],
		(size, deferred) => {
			webpack({
				context: fixtures,
				entry: `./${size}.js`,
				output: {
					path: outputPath,
					filename: "bundle.js"
				}
			}, err => {
				if(err) throw err;
				deferred.resolve();
			});
		}
	],
	"eval dev build": [
		[0, 1, 2, 5, 10, 15],
		(size, deferred) => {
			webpack({
				context: fixtures,
				entry: `./${size}.big.js`,
				output: {
					path: outputPath,
					filename: "bundle.js"
				},
				devtool: "eval"
			}, err => {
				if(err) throw err;
				deferred.resolve();
			});
		}
	],
	"sourcemap build": [
		[0, 1, 2, 5, 10, 15],
		(size, deferred) => {
			webpack({
				context: fixtures,
				entry: `./${size}.big.js`,
				output: {
					path: outputPath,
					filename: "bundle.js"
				},
				devtool: "source-map"
			}, err => {
				if(err) throw err;
				deferred.resolve();
			});
		}
	],
	"cheap sourcemap build": [
		[0, 1, 2, 5, 10, 15],
		(size, deferred) => {
			webpack({
				context: fixtures,
				entry: `./${size}.big.js`,
				output: {
					path: outputPath,
					filename: "bundle.js"
				},
				devtool: "cheap-source-map"
			}, err => {
				if(err) throw err;
				deferred.resolve();
			});
		}
	],
	"build w/ chunks": [
		[0, 1, 5, 10, 50, 100, 200],
		(size, deferred) => {
			webpack({
				context: fixtures,
				entry: `./${size}.async.js`,
				output: {
					path: outputPath,
					filename: "bundle.js"
				}
			}, err => {
				if(err) throw err;
				deferred.resolve();
			});
		}
	],
	"build w/ chunks": [
		[0, 1, 5, 10, 50, 100, 200],
		(size, deferred) => {
			webpack({
				context: fixtures,
				entry: "./" + size + ".async.js",
				output: {
					path: outputPath,
					filename: "bundle.js"
				}
			}, err => {
				if(err) throw err;
				deferred.resolve();
			});
		}
	],
	"incremental": [
		[0, 1, 5, 10, 50, 100, 200],
		(size, deferred) => {
			var compiler = webpack({
				cache: true,
				context: fixtures,
				entry: "./" + size + ".js",
				output: {
					path: outputPath,
					filename: "bundle.js"
				}
			});
			runTimes(compiler, 2, deferred);
		}
	],
	"incremental cheap sourcemap": [
		[1, 2, 3, 4, 5, 6],
		(size, deferred) => {
			var compiler = webpack({
				cache: true,
				context: fixtures,
				entry: "./200.js",
				output: {
					path: outputPath,
					filename: "bundle.js"
				},
				devtool: "cheap-source-map"
			});
			runTimes(compiler, size, deferred);
		}
	],
	"incremental2": [
		[0, 1, 5, 10, 50, 100, 200],
		(size, deferred) => {
			var compiler = webpack({
				cache: true,
				context: fixtures,
				entry: `./${size}.js`,
				output: {
					path: outputPath,
					filename: "bundle.js"
				}
			});
			runTimes(compiler, 3, deferred);
		}
	],
	"incremental4": [
		[0, 1, 5, 10, 50, 100, 200],
		(size, deferred) => {
			var compiler = webpack({
				cache: true,
				context: fixtures,
				entry: `./${size}.js`,
				output: {
					path: outputPath,
					filename: "bundle.js"
				}
			});
			runTimes(compiler, 5, deferred);
		}
	],
	"incremental16": [
		[0, 1, 5, 10, 50, 100, 200],
		(size, deferred) => {
			var compiler = webpack({
				cache: true,
				context: fixtures,
				entry: `./${size}.js`,
				output: {
					path: outputPath,
					filename: "bundle.js"
				}
			});
			runTimes(compiler, 17, deferred);
		}
	],
};

const suite = new Benchmark.Suite;

Object.keys(tests).filter(name => process.argv.length > 2 ? name.includes(process.argv[2]) : true)
	.forEach(name => {
		const test = tests[name];
		test[0].forEach(size => {
			suite.add(`${name} ${size}`, deferred => {
				test[1](size, deferred);
			}, benchmarkOptions);
		});
	});

suite.on("cycle", event => {
	process.stderr.write("\n");
	const b = event.target;
	console.log(b.name + "\t" + Math.floor(1000 * (b.stats.mean - b.stats.moe)) + "\t" + Math.floor(1000 * (b.stats.mean + b.stats.moe)));
});

suite.run({
	async: true
});