@megafon/chunk-sizes-webpack-plugin

ChunkSizesWebpackPlugin

Webpack plugin for collecting and reporting chunks sizes in OpenMetrics format. Applicable for gitlab metrics feature.

Plugin supports webpack 4 and webpack 5.

Usage

Installation

$ yarn add -D chunk-sizes-webpack-plugin

Webpack configuration

const { ChunkSizesWebpackPlugin } = require('chunk-sizes-webpack-plugin');

module.exports = [
    {
        ...,
        plugins: [
            new ChunkSizesWebpackPlugin(),
        ],
    }
];

Plugin options

All parameters are optional.

option	type	default	description
outputFilename	string	chunk_sizes.txt	Report file name.
outputFolder	string	Webpack's config output.path.	Report destination folder.
overwrite	boolean	true	Overwrite file on report generation.
customLabels	Record<string, string>	{}	Additional custom labels in format: { labelName1: value1, labelName2: value2 }. Values will be appended in every entry's labels list.
metricName	string	chunk_size_<unit name>	Metric custom name. Default example: for unit = kb metric name will be chunk_size_kilobytes.
chunkLabelName	string	chunk	Chunk label name.
unit	mb, kb, B	kb	Units for metric output. Supported values: - mb (megabytes) - kb (kilobytes) - B (bytes)

Chunks labels

For chunk name definition webpack uses entry's property name by default. main will be used by default if this name is missing. This can lead to metrics duplication in case of several webpack configurations in one build.

Possible solutions:

• Set up names for all entries
• Use customLabels parameter

Report file

Plugin will overwrite report file on every run by default. In case of several webpack configurations in one build use overwrite = false and remove report file before next build manually.

Examples

Demo configuration.

Includes two builds:

1. entry (main) with lazily-loaded modules (chunkOne and chunkTwo)
2. simple entry (myFavoriteEntry)

• Note: option overwrite: false should be added in every example bellow because of two builds in one config.

Defaults

// for both entries
new ChunkSizesWebpackPlugin({
    overwrite: false,
})

chunk_size_kilobytes{chunk="main"} 2.88
chunk_size_kilobytes{chunk="chunkTwo"} 0.09
chunk_size_kilobytes{chunk="chunkOne"} 0.09
chunk_size_kilobytes{chunk="myFavoriteEntry"} 0.08

With custom labels

// main entry
new ChunkSizesWebpackPlugin({
    overwrite: false,
    customLabels: {
        customLabel: 'custom-value',
    },
})

// myFavoriteEntry
new ChunkSizesWebpackPlugin({
    overwrite: false,
    customLabels: {
        bundle: 'myFavoriteBundle',
    },
})

chunk_size_kilobytes{bundle="myFavoriteBundle",chunk="myFavoriteEntry"} 0.08
chunk_size_kilobytes{customLabel="custom-value",chunk="main"} 2.88
chunk_size_kilobytes{customLabel="custom-value",chunk="chunkTwo"} 0.09
chunk_size_kilobytes{customLabel="custom-value",chunk="chunkOne"} 0.09

With custom metric name

// for both entries
new ChunkSizesWebpackPlugin({
    overwrite: false,
    metricName: 'custom_metric_name',
})

custom_metric_name{chunk="myFavoriteEntry"} 0.08
custom_metric_name{chunk="main"} 2.88
custom_metric_name{chunk="chunkTwo"} 0.09
custom_metric_name{chunk="chunkOne"} 0.09

With custom chunk label name

// for both entries
new ChunkSizesWebpackPlugin({
    overwrite: false,
    chunkLabelName: 'particle',
})

chunk_size_kilobytes{particle="myFavoriteEntry"} 0.08
chunk_size_kilobytes{particle="main"} 2.88
chunk_size_kilobytes{particle="chunkTwo"} 0.09
chunk_size_kilobytes{particle="chunkOne"} 0.09

With bytes in unit

// for both entries
new ChunkSizesWebpackPlugin({
    overwrite: false,
    unit: 'B',
})

chunk_size_bytes{chunk="myFavoriteEntry"} 81
chunk_size_bytes{chunk="main"} 2946
chunk_size_bytes{chunk="chunkTwo"} 93
chunk_size_bytes{chunk="chunkOne"} 92

Contributing

Follow CONTRIBUTING.md and CODE_OF_CONDUCT.md.