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    Internationalization Plugin for Webpack

    Webpack plugin with loader for build locales according to component approach

    This is webpack plugin designed to build locale assets. Advantages to use:

    • component approach - merge locales from different application volumes or its components or from external libraries
    • acceleration - minimize download time and amount of traffic by loading only the required locale
    • configuration flexibility - locales sources may be described by the list of require/import in the js source (due to deep webpack integration) or as simple glob path pattern in the wepback configuration file
    • developing flexibility - immediately locale change updatetion in the application under webpack dev server (due to deep webpack integration)
    • make structure flatten - make struct entries keys flatten (if needed) for easier to use the branch path as a string key

    This is locale data build tool and it is independent from internationalization library or framework which may be react-intl or i18n-js or yui-intl or angular-dynamic-locale or any your favorite internationalization system. A link to a running


    npm install --save intl-webpack-plugin

    Webpack configuration

    This example is minimal configuration to merge json to single asset:

      module: {
        rules: [
          { test: /\.(intl|i18n|yml|yaml)$/i,
            use: [
      plugins: [
        new IntlPlugin({
          search: [ './src/**/*.intl' ]


    The name of file is locale identificator but this may be changed to file extestion by configure using grouping technique

    In order to require the builded locale asset need at least one file which name matches name of locale. To change this, it is need to configure the webpack module loading rules and grouping technique as need.

    The locale file may be empty (or an empty hash for json format) because actually loaded asset will be populated with other joined sources of current locale.

    import en from 'en.intl'
    import de from 'de.intl'
    import fr from 'fr.intl'

    These imported variables contain public urls of assets with locale assembly.

    In order to involve files into locale assebly, files must be required by require function or import somewhere in code or described by pattern in search param of plugin configuration.

    Refer to demonstration application with internationalization for more details about how to configure application and how to import library with support internationalization.

    Building libraries

    This section is for component library developers.

    Refer to the demonstration component library example which demonstrates how to create library with support of internationalization and documentation how to integrate it in application.

    To join locales from library package to application locale assets need to:

    • describe in documentation locale structure organization and format to load, and enumerate supported locales - this required to configure this webpack plugin with loaders
    • export file which each locale file is required by calling require function or by import, describe how to require it in code
    • and/or another way is to describe path pattern to locale files and how to configure plugin to search and prefetch

    So application developers may identify how to integrate location assets to application and choose way how to configure plugin to join library package locales with application locales. More about format and structure organization described in component approach

    Library package locales may be joined by define pattern in search plugin option or by importing module from library in which library locales enumerated by calling require function or import.

    Plugin configuration

    IntlPlugin typically created at the webpack configuration file and waits hash of configuration options as its creation param:

    var IntlPlugin = require("intl-webpack-plugin");
    var intlPlugin = new IntlPlugin({
      search: 'glob' || ['globs',...],
      skip: 'substr' || /regexp/ || [ 'substr', /regex/, ...],
      flattenLowness: 1,
      flattenDepth: 2,


    • search - glob pattern or pattern array to find and prefetch see glob module for reference
    • skip - substring or regular expression or array to skip some from the searched results
    • flattenLowness - the level from which struct will be flatten. The default value of flattenLowness is 1 which reserved for top level key locale name, and any another purpose if it does not intersect with the names of locales.
    • flattenDepth - flattenization depth level. The default value flattenDepth is not defined which mean depth does not limited and works through the depth, to disable flattenization specify value 1 on flattenDepth
    • group - the default group loader option, the default value is '[name]' to join in groups by file name which is equal to the name of the locale
    • name - default name loader option (define pattern for asset file name)

    The search param is like multi-require with glob patterns. Only files that required by require function in code will be loaded in that case.

    Any file that do not match to search or skip param and match to loader section in webpack config and is required in code by function require or import will be loaded and merged anyway.

    Loader configuration

    The loader() method includes intl loader into loader chain.

    var IntlPlugin = require("intl-webpack-plugin");
    var theIntl = new IntlPlugin({...})
      module: {
      loaders: [
          // some more pre loaders
      plugins: [

    Preliminary loaders must be applied before intl loader. This means that intl loader must be final loader in loaders chain.

    Loader function waits hash of configuration options as its param. Default values of loader may be specified in plugin configuration described above.

    Loader options:

    • group - devides files into separated assets by specifying groping pattern. May include template placeholders described below in groupping section.
    • name - specifies destination asset file name. String value supportive loader template interpolation placeholders.

    Configuration options specified directly in call loader() function override same values specified as default in plugin configuration.

    The loader() function may be invoked as class function if only one plugin instance is passed to config. Therefore it is better to use object form instead of class form:

    var theIntl = new IntlPlugin({...})
    loaders: [
      // this form valid only for single plugin instance:
      // to avoid problems better to use always object form:

    See also




    npm i intl-webpack-plugin

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