vchas.blogg.se - How to run webpack locally

How to run webpack locally install#
How to run webpack locally upgrade#
How to run webpack locally code#

Simply transpiling the CoffeeScript files to JS with the coffee CLI, and then manually cleaning them up removed this dependency for us.

How to run webpack locally install#

Not to mention the benefit of reducing the npm install time, and reducing our dependency count! Compared with babel-loader taking an average of 561 ms, this was an obvious enough opportunity for improvement.

However, SMP revealed that coffee-loader was taking 1,078 ms on average for each module.

How to run webpack locally code#

This was never seen as that big a deal before, as the code was rarely touched, and the loader did its job fine.

We had some legacy code that was written in CoffeeScript. The time saved locally during a re-run is huge, but the initial (cold) run will actually be slower.Ĭaching on production builds that should be running from scratch each time anyway will just be slowing you down.

All of these caching methods have an overhead to boot up. There are a few ways to cache with webpack - like using cache-loader, HardSourceWebpackPlugin, or the ?cacheLoader babel flag. For local development, this is quite a lot of unnecessary work. The image-webpack-loader optimises these images, minifying and re-encoding them. Most webpack configs have a rule to handle images, and that rule is normally file-loader followed by image-webpack-loader, or some other similar image loader.īut the only necessary loader here is the file-loader, which actually allows the image to end up in the output directory, and its URI passed to the bundle. Remove Image Loaders for Local Development For us, running on i3.4xlarge EC2 instances with 16 vCPUs, this was considerable. Turning on the parallel flag, however, can save you a lot of time - depending on how beefy your machine is, and how many cores it has. If you’re only uglifying on a build server like Jenkins, then caching doesn’t really help you. Version 1 of the plugin introduces some performance features - namely parallelisation, and caching. However, there’s nothing stopping you from upgrading your UglifyJsPlugin version without upgrading webpack, and just manually importing the plugin instead. We were originally using webpack 3’s built-in UglifyJsPlugin which is set at version 0.4.6. For us it took 65% of the entire build time!

How to run webpack locally upgrade#

Upgrade and Parallelise UglifyJsPluginĮven a cursory glance at SMP’s output shows that UglifyJsPlugin takes a long time to run.

Jenkins (full production build): 3 mins, 26 secs 2.

Locally (watch mode changes ): 6.49 secs.

Overall, in a repo containing around 50,000 lines of JS/CSS code, these were our build times: I’ve talked about SMP a bit already, so won’t go into it in any more detail in this post. This let us focus our search, and work out where the easiest wins were. I created the Speed Measure Plugin for webpack, which we used to analyse the performance of our plugins and loaders. This really helps to find your current bottlenecks, and compare your progress as you make changes. But, we also made some changes that haven’t been commonly mentioned anywhere else - so I want to discuss them here. We followed these articles very closely, and used a lot of their suggestions.

build performance (on the webpack wiki).

0–100 in two seconds - speed up webpack (by gvidon).

There are already some great articles that discuss ways to increase build speed. Eventually, we snapped and decided to get that build time way down. As is always the case given the speed of development, our webpack config grew organically, and the speed of the pipeline was an after-thought.īut there came a tipping point. It’s only so often you can wait 5 whole seconds for your build to apply your color: blue to color: red change…Īt Onfido, we use webpack as our module bundler.

GitHub 🔥 Speeding Up Webpack Seven 3 second changes to reduce build time by 77% Posted on 28 March 2018 by Stephen Cook.