craigtaub / check-v8-optimised

Check if your module/function is optimised for the V8 engine.

Check V8 Optimised

Check if your module/function is optimized for the V8 engine. Download it and run it against (and from within) any module/function very quickly.

If it isn't check the WHY section below on reading material to help find reasons why and optimize your code.

Install

npm install check-v8-optimised

Usage

var optimiser = require('check-v8-optimised');
var someModule = require('./someModule');

// specify arguments for your function
var args = [1, 2];
var optimiserResult = optimiser(someModule, args);

console.log(optimiserResult); // prints "Function is optimized"

The module returns a string which can be outputted to console, parsed inside a test or used anyway you like.

node yourFile.js

Test + Linter

npm run test
npm run lint

How

Using available low level diagnostic commands in the V8 engine, can ask if a given function is optimized. See below for possible reasons why.

Why?

Inspired by an article from Bluebird on V8 optimising.

• https://github.com/petkaantonov/bluebird/wiki/Optimization-killers#2-unsupported-syntax
• http://bahmutov.calepin.co/detecting-function-optimizations-in-v8.html