feat: remove unsed locales (#57)

* feat: remove unsed locales

* fix: import from 'esm'

* fix: imports

* fix: import locales

* style: fix escape

* chore: update lock file

* fix: import locales

Author: ricardogobbosouza

lib/module.js

@@ -16,20 +16,10 @@ module.exports = function (moduleOptions) {
     ...moduleOptions
   }
 
-  if (options.defaultLocale) {
-    options.defaultLocale = options.defaultLocale.replace(/[_-]/, '')
-  }
-
-  if (options.fallbackLocale) {
-    options.fallbackLocale = options.fallbackLocale.replace(/[_-]/, '')
-  }
-
   if (!Array.isArray(options.locales)) {
     options.locales = [options.locales]
   }
 
-  options.locales = options.locales.map(l => l.replace(/[_-]/, ''))
-
   if (options.defaultLocale && !options.locales.includes(options.defaultLocale)) {
     options.locales.push(options.defaultLocale)
   }
@@ -43,6 +33,15 @@ module.exports = function (moduleOptions) {
     fileName: 'date-fns.js',
     options
   })
+
+  this.extendBuild((config) => {
+    const { ContextReplacementPlugin } = require('webpack')
+
+    config.plugins.push(new ContextReplacementPlugin(
+      /date-fns[/\\]/,
+      new RegExp(`[/\\\\](${options.locales.join('|')})[/\\\\]index.js$`)
+    ))
+  })
 }
 
 module.exports.meta = require('../package.json')

lib/plugin.js

@@ -1,19 +1,26 @@
-<% if (options.methods) { %>
-import { <%= options.methods.join(', ') %> } from 'date-fns'
-<% } else { %>
-import * as dateFns from 'date-fns'
-<% } %>
-
-<% if (options.locales) { %>
-import { <%= options.locales.join(', ') %> } from 'date-fns/locale'
-<% } %>
-
-export default (ctx, inject) => {
-  <% if (options.methods) { %>
+<% if (options.methods && options.methods.length) { %>import { <%= options.methods.join(', ') %> } from 'date-fns'
+<% } else { %>import * as dateFns from 'date-fns'<% } %>
+
+const locales = []
+
+const importLocale = async (locale) => {
+  try {
+    locales[locale] = await import(`date-fns/locale/${locale}/index.js`)
+  } catch (e) {
+    //
+  }
+}
+
+export default async (ctx, inject) => {
+  <% if (options.methods && options.methods.length) { %>
   const dateFns = { <%= options.methods.join(', ') %> }
   <% } %>
   const dateObj = {...dateFns}
 
+  <% if (options.locales && options.locales.length) { %>
+  <%= options.locales.map(l => `await importLocale('${l}')`).join('\n') %>
+  <% } %>
+
   function parsedDate(date) {
     if (dateFns.parseISO) {
       return typeof date !== 'string' ? date : dateFns.parseISO(date)
@@ -77,10 +84,6 @@ export default (ctx, inject) => {
 }
 
 function mergeOptions(options) {
-  const locales = []
-
-  <%= options.locales.map(l => `locales['${l}'] = ${l}` ).join('\n') %>
-
   <% if (options.defaultLocale) { %>
   options = { locale: '<%= options.defaultLocale %>', ...options }
   <% } %>
@@ -90,13 +93,11 @@ function mergeOptions(options) {
   <% } %>
 
   if (options && typeof options.locale === 'string') {
-    const locale = options.locale.replace(/[_-]/, '')
-    const fallbackLocale = options.fallbackLocale ? options.fallbackLocale.replace(/[_-]/, '') : null
-    if (locales[locale]) {
-      options.locale = locales[locale]
-    } else if (fallbackLocale && locales[fallbackLocale]) {
+    if (locales[options.locale]) {
+      options.locale = locales[options.locale]
+    } else if (options.fallbackLocale && locales[options.fallbackLocale]) {
       console.warn(`[date-fns] locale '${options.locale}' not found, using fallback locale '${options.fallbackLocale}'`)
-      options.locale = locales[fallbackLocale]
+      options.locale = locales[options.fallbackLocale]
     } else {
       console.warn(`[date-fns] locale '${options.locale}' not found.`)
     }