Webpack: silence output

Question

I would like to know if there's a configuration option to tell webpack to only log the "important information" to the terminal. Pretty much just errors and warnings, not all of this:

There's just so much output! Would love to suppress the common stuff and only have webpack output the warnings/errors. Would like a solution for webpack, webpack-dev-server, and karma-webpack.

Note: I tried noInfo: true and quiet: true but that didn't seem to do the trick.

---

Edit: I'm thinking this may not be possible, so I've created an issue on github: https://github.com/webpack/webpack/issues/1191

Answer 1

I don't know when this feature was added, but I just noticed in the docs that you can add a webpackMiddleware property and on that you can specify noInfo: true. Doing this removes all the noise! But you still see output when there are errors. Yay!

Answer 2

webpack --stats errors-only is the command line flag you probably want (v5).

Answer 3

These days noInfo quiet and stats have been replaced by infrastructureLogging in the root of your Webpack config:

// webpack.config.js
...
infrastructureLogging: {
  level: 'error',
},

Answer 4

Webpack v5

The "most silent" configuration:

infrastructureLogging: { level: 'error' },
stats: 'minimal',

Docs: infrastructureLogging, stats.

Answer 5

You've got the --display option that enables you to choose a level of information quantity you want displayed.

From webpack --help:

--display: Select display preset
[string] [choices: "", "verbose", "detailed", "normal", "minimal", "errors-only", "none"]

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If you want to configure the informations displayed more precisely, you can also configure your webpack with the stats field in your webpack.config.js.

Answer 6

Actually, these two work great.

stats: 'errors-only',

at the end of the exported object.

One could also use stats: 'minimal', it only outputs when errors or new compilation happen. Read more from the official documentation of Webpack.

Answer 7

In my webpack config, Doing this reduced my incremental build time by 8 seconds and silenced output. The main one is chunks: false

Play with it to fit your needs

module.exports = {
 devServer: {
  stats: {
    colors: true,
    hash: false,
    version: false,
    timings: false,
    assets: false,
    chunks: false,
    modules: false,
    reasons: false,
    children: false,
    source: false,
    errors: false,
    errorDetails: false,
    warnings: false,
    publicPath: false
  }
 }
}

Answer 8

What you're interested in here is stats module (part) of the Webpack. Basically, it's this module that produces the output. The output by default mostly contains list of assets, and list of modules. You can hide modules with --hide-modules directive. Regarding assets, no similar option exists. But there are presets. You can specify preset with --display option. And preset that hides assets is... none.

There is another way to influence stats: webpack.config.js. Add stats: {assets: false, modules: false} to reduce output significantly. Or stats: 'none' to silence Webpack entirely. Not that I recommend it. Generally errors-only is a way to go. To make it affect webpack-dev-server put it under devServer key.

Webpack 2.x doesn't have --display option. And the only way to hide modules is --hide-modules switch. By that I mean that specifying stats: 'errors-only' or stats: {modules: false} in config has no effect. Since this piece of code overrides all that.

For webpack-dev-server there are also --no-info and --quiet options.

Some more insight into how it works. webpack-cli creates outputOptions object. When compilation finishes, it converts stats to string and outputs it. Stats.toString converts stats to json, then converts json to string. Here you can see the defaults.

Answer 9

Webpack

  ...
  stats: {
    modules: false,
  },
  ...

Dev Server

  ...
  devServer: {
    stats: {
      modules: false,
    },
  },
  ...

Reference

https://webpack.js.org/configuration/stats/

Answer 10

Recommend stats config below, this will keep significant logs and remove useless info.

stats: {
  cached: false,
  cachedAssets: false,
  chunks: false,
  chunkModules: false,
  chunkOrigins: false,
  modules: false
}

Answer 11

With Webpack 5 I had to remove stats from devServer and add it as a base config property. All the relevant stats can be found here for additional configuration https://webpack.js.org/configuration/stats/

https://webpack.js.org/configuration/other-options/#infrastructurelogging

The following worked for me: (I use friendly-errors)

{
  stats: 'errors-only',
  infrastructureLogging: {
    level: 'none',
  },
  devServer:{
    // other config
  }
}

You can also be more specific about what to display using an object.

{
  stats: {
    entrypoints: false,
    colors: true,
    assets: false,
    chunks: false,
    modules: false,
  },
  infrastructureLogging: {
    level: 'none',
  },
  devServer:{
    // other config
  }
}

Answer 12

If you're using the Webpack API directly, and you're calling stats.toString(), then you can pass parameters to keep down the noise:

webpack(config).watch(100, (err, stats) => {
  console.log(stats.toString({chunks: false}))
})

Answer 13

If you are using the webpack-dev-middleware you can throw the noInfo: true in an object as the second parameter. Also assuming you also have a node/express server running.

Cheers.