npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

babel-plugin-annotate-pure-calls

v0.4.0

Published

Babel plugin for annotating automatically pure function calls.

Downloads

387,528

Readme

babel-plugin-annotate-pure-calls

npm version Build Status npm

This plugins helps with automatic #__PURE__ annotation insertion. It add the comment to top level call expressions and new expressions in assignment contexts (those are considered by the plugin as side effect free). This helps UglifyJS to perform dead code elimination more efficiently and therefore reduces the bundle sizes for the consumers.

NOTE: It might break your code, so the caution is advised. Target audience for the plugin are libraries, which in vast major of use cases do not introduce side effects in top level calls. That doesn't mean that application bundles cannot benefit from the plugin.

Pure calls

// pure call
var inc = add(1)

// clearly impure - no assignment context
mutate({ prop: 'value' })

Top level calls

Top level call (in terms of this plugin) is one that gets executed during script initialization. So it is every call located at the root of a file, but also a call in an IIFE that gets executed at startup (including nested ones).

var a = topLevelCall()

b = function() {
  noTopLevelCall()
}

topLevelIIFEs = (function() {
  var c = (function() {
    var d = (function() {
      var e = topLevelCall()
    })()
  })()
})()

Installation

npm install --save-dev babel-plugin-annotate-pure-calls

Usage

Via .babelrc (Recommended)

.babelrc

{
  "plugins": ["annotate-pure-calls"]
}

Via CLI

babel --plugins annotate-pure-calls script.js

Via Node API

require('babel-core').transform('var inc = add(1)', {
  plugins: ['annotate-pure-calls'],
})

Usage with babel@6

The plugin works with babel@6, you might see unmet peer dependency warning though. If you want to get rid of it, please install @babel/[email protected].

Similar projects