feat: Include two versions of the timeZone plugin with limited data

* 1900-2050
* 2012-2022

README.md

@@ -52,6 +52,7 @@ dayjs().startOf('month').add(1, 'day').set('year', 2018).format('YYYY-MM-DD HH:m
 ```js
 // Load dayjs, plugins and language packs.
 import dayjs from 'dayjs-ext'
+// import "timeZone-1900-2050" or "timeZone-2012-2022" to save your package size
 import timeZonePlugin from 'dayjs-ext/plugin/timeZone'
 import customParseFormat from 'dayjs-ext/plugin/customParseFormat'
 import localizableFormat from 'dayjs-ext/plugin/localizableFormat'
@@ -99,7 +100,10 @@ If used in the browser, the following scripts would be needed:
 <script arc="https://unpkg.com/timezone-support/dist/index.umd.js"></script>
 <script arc="https://unpkg.com/fast-plural-rules/dist/index.umd.js"></script>
 <script arc="https://unpkg.com/dayjs-ext/dayjs.min.js"></script>
+<-- include "timeZone-1900-2050" or "timeZone-2012-2022" to save your package size -->
 <script arc="https://unpkg.com/dayjs-ext/plugin/timeZone.js"></script>
+<script arc="https://unpkg.com/dayjs-ext/plugin/customParseFormat.js"></script>
+<script arc="https://unpkg.com/dayjs-ext/plugin/localizableFormat.js"></script>
 <script arc="https://unpkg.com/dayjs-ext/plugin/relativeTime.js"></script>
 ```
 

build/index.js

@@ -7,6 +7,8 @@ const configFactory = require('./rollup.config')
 const { promisify } = util
 
 const promisifyReadDir = promisify(fs.readdir)
+const promisifyReadFile = promisify(fs.readFile)
+const promisifyWriteFile = promisify(fs.writeFile)
 
 const formatName = n => n.replace(/\.js/, '').replace('-', '_')
 
@@ -15,6 +17,20 @@ async function build(option) {
   await bundle.write(option.output)
 }
 
+async function addLimitedTimeZonePluginVersions() {
+  const originalFile = path.join(__dirname, '../plugin/timeZone.js')
+  const originalContent = await promisifyReadFile(originalFile, { encoding: 'utf-8' })
+  const limitedVersions = ['1900-2050', '2012-2022']
+  for (let i = 0; i < limitedVersions.length; ++i) { // eslint-disable-line no-plusplus
+    const limitedVersion = limitedVersions[i]
+    const limitedFile = path.join(__dirname, `../plugin/timeZone-${limitedVersion}.js`)
+    const limitedContent = originalContent.replace('require("timezone-support")',
+      `require("timezone-support/dist/index-${limitedVersion}")`)
+    // eslint-disable-next-line no-await-in-loop
+    await promisifyWriteFile(limitedFile, limitedContent)
+  }
+}
+
 (async () => {
   try {
     const locales = await promisifyReadDir(path.join(__dirname, '../src/locale'))
@@ -39,6 +55,8 @@ async function build(option) {
       input: './src/index.js',
       fileName: './dayjs.min.js'
     }))
+
+    addLimitedTimeZonePluginVersions()
   } catch (e) {
     console.error(e) // eslint-disable-line no-console
   }

docs/en/Plugin.md

@@ -245,6 +245,7 @@ If the plugin [LocalizableFormat](#localizableformat) is installed, format token
  - TimeZone extends `dayjs()` and `dayjs().format` APIs to support the most important usage scenatrios - parsing from a specific time zone and formatting in other time zone.
 
 ```javascript
+// import "timeZone-1900-2050" or "timeZone-2012-2022" to save your package size
 import timeZone from 'dayjs-ext/plugin/timeZone'
 
 dayjs.extend(timeZone)
@@ -282,7 +283,9 @@ This plugin has a dependency on the [`timezone-support`](https://www.npmjs.com/p
 
 ```html
 <script arc="https://unpkg.com/dayjs-ext/dayjs.min.js"></script>
+<-- include "timeZone-1900-2050" or "timeZone-2012-2022" to save your package size -->
 <script arc="https://unpkg.com/dayjs-ext/plugin/timeZone.js"></script>
+<-- include "index-1900-2050.umd.js" or "index-2012-2022.umd.js" to save your package size -->
 <script arc="https://unpkg.com/timezone-support/dist/index.umd.js"></script>
 ```