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49 lines
1.4 KiB
49 lines
1.4 KiB
# webpack
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## Removing unused languages from dynamic import
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If a locale is imported dynamically, then all locales from date-fns are loaded by webpack into a bundle (~160kb) or split across the chunks. This prolongs the build process and increases the amount of space taken. However, it is possible to use webpack to trim down languages using [ContextReplacementPlugin].
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Let's assume that we have a single point in which supported locales are present:
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`config.js`:
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```js
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// `see date-fns/src/locale` for available locales
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export const supportedLocales = ['en-US', 'de', 'pl', 'it']
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```
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We could also have a function that formats the date:
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```js
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const getLocale = (locale) => import(`date-fns/locale/${locale}/index.js`) // or require() if using CommonJS
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const formatDate = (date, formatStyle, locale) => {
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return format(date, formatStyle, {
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locale: getLocale(locale),
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})
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}
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```
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In order to exclude unused languages we can use webpacks [ContextReplacementPlugin].
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`webpack.config.js`:
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```js
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import webpack from 'webpack'
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import { supportedLocales } from './config.js'
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export default const config = {
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plugins: [
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new webpack.ContextReplacementPlugin(
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/date\-fns[\/\\]/,
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new RegExp(`[/\\\\\](${supportedLocales.join('|')})[/\\\\\]index\.js$`)
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)
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]
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}
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```
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This results in a language bundle of ~23kb .
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[contextreplacementplugin]: https://webpack.js.org/plugins/context-replacement-plugin/
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