test-webpack-reporter-plugin

webpack-reporter-plugin

A plugin to customize webpack's output

Table of Contents

• Description
• Install
• Usage
• Configuration
• Custom Reporters
• HookData Structure
• Testing

Description

There are currently 2 ways of customizing webpack's output, you can set the “stats” option to configure which bundle information you want to display or you can write a plugin (e.g. ProgressPlugin, webpackbar, friendly-errors-webpack-plugin). The second approach gives you more control over the output but requires a good knowledge of how webpack works internally. This plugin abstract over webpack's internals helping writing custom reporters.

Install

You can install the plugin from npm using the following command:

npm install test-webpack-reporter-plugin --save-dev

or

yarn add test-webpack-reporter-plugin -D

Usage

You can use it like any other plugin in your webpack configuration:

webpack.config.js

module.exports = {
  // ...
  plugins: [
    // each parameter is optional
    new ReporterPlugin({
      hooks: {
        defaults: true,
        // wheter or not include the default hooks [default: true]
        compiler: {
          done: true, // listen this hook
          emit: false, // don't listen this hook
        },
        compilation: {
          buildModule: 5, // log this hook once every 5 times
          contentHash: '2ms', // log this hook at most once every 2ms
        },
      },
      reporters: [
        // one or more custom reporters
        // this is the default one, used if no reporter is given
        new ReporterPlugin.Reporter(),
      ],
    }),
  ],
};

Here's an example of how the output will look like (coloured for readability):

Configuration

This plugin accepts an obect as parameter containing two properties:

reporters (optional)

An array containing one or more reporters that will log the events emitted by this plugin. If not set, a default one will be used.

const MyReporter = require('./MyReporter');
//...
new ReporterPlugin({
  reporters: [new MyReporter()],
});

hooks (optional)

An object used to configure which webpack hooks the plugin should listen and log. It can have those properties:

• defaults (optional)

  Tells the plugin if it should listen to a predefined set of hooks (e.g. compilation.done). Setting it to false will exclude every default hook, otherwise its default value is true.

• compiler (optional)

  Tells the plugin which compiler hooks should be included or excluded

  new ReporterPlugin({
    hooks: {
      compiler: {
        beforeRun: false, // don't log this hook
        done: true, // listen this hook
      },
    },
  });

• compilation (optional)

  Tells the plugin which compilation hooks should be included or excluded

  new ReporterPlugin({
    hooks: {
      compilation: {
        seal: false, // don't log this hook
        record: true, // log this hook
      },
    },
  });

Throttling

Some hooks like compilation.buildModule may be called many times during a webpack compilation, it is possible to limit the frequency of logging for specific hooks setting a "throttle value" that could be:

• integer

  Meaning that the hook will be logged once every given number of times the hook is called (e.g. once very 2 times)

  new ReporterPlugin({
    hooks: {
      compilation: {
        buildModule: 2,
      },
    },
  });

• string

  A string encoding a milliseconds value (e.g. "2ms", '20ms') meaning that the hook will be logged once every given milliseconds

  new ReporterPlugin({
    hooks: {
      compilation: {
        buildModule: '2ms',
      },
    },
  });

Custom Reporters

This plugin can be extended with one or more reporters. A custom reporter is similar to a usual webpack plugin:

reporter.js

class Reporter {
  apply(reporter, outputOptions) {
    // Adds a listener for a specific log
    reporter.hooks.info.tap('Reporter', this.onInfo);
    reporter.hooks.stats.tap('Reporter', this.onStats);
    reporter.hooks.error.tap('Reporter', this.onError);
    reporter.hooks.warn.tap('Reporter', this.onWarning);
  }
  onInfo(hookData) {
    // print something
  }
}

HookData Structure

The reporter plugin has 4 sync waterfall hooks (see tapable): stats, info, warn and error. Each hook callback receives some data with this structure:

// data emitted by each reporter hook
const hookData = {
  hookId: 'compiler.done', // hook's id
  count: 0, // counter of times the hook is executed
  lastCall: 1561725682, // last hook trigger timestamp
  message: 'Compilation finished', // custom message
  context: {...}, // optional, hook context
  data: {} // custom hook data
}

Testing

npm run test

🤝 Contributing

Contributions, issues and feature requests are welcome!
Feel free to check issues page.

Show your support

Give a ⭐️ if this project helped you!

👤 Devid Farinelli

• Twitter: @misterdev_
• Github: @misterdev

📝 License

Copyright © 2019 Devid Farinelli.
This project is MIT licensed.

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