54 lines
1.5 KiB
Markdown
54 lines
1.5 KiB
Markdown
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# 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/${locale}.js`); // or require() if using CommonJS
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const formatDate = (date, formatStyle, locale) => {
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return format(date, formatStyle, {
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locale: getLocale(locale).default,
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});
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};
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```
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In order to exclude unused languages we can use webpacks [ContextReplacementPlugin].
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`webpack.config.js`:
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```js
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import webpack from "webpack";
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import { supportedLocales } from "./config.js";
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export default config = {
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resolve: {
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alias: {
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"date-fns-locale": path.dirname(require.resolve("date-fns/package.json")),
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},
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},
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plugins: [
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new webpack.ContextReplacementPlugin(
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/date-fns[/\\]locale/,
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new RegExp(`(${locales.join("|")})\.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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