Cant add isSameOrAfter plugin: Cannot read property '$i' of undefined

Describe the bug

<script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.10.4/dayjs.min.js"></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/dayjs/1.10.4/plugin/isSameOrAfter.min.js"></script>

<script>
dayjs.extend(window.isSameOrAfter);
</script>

Uncaught TypeError: Cannot read property '$i' of undefined
    at Function.v.extend (dayjs.min.js:1)
    at register:724

Expected behavior no error

Information

• Day.js Version 1.10.4
• OS: [e.g. iOS]
• Browser chrome
• Time zone: [Asia Singapore]

[cilf]

this worked for me:

import * as dayjs from 'dayjs';
import * as utc from 'dayjs/plugin/utc';
import * as timezone from 'dayjs/plugin/timezone';
dayjs.extend(utc);
dayjs.extend(timezone);
dayjs.tz.setDefault('Europe/Prague');

[josephcondon]

@chrisvidal I also had the same issue and found a different way of extending; Add dayjs_plugin_ before the plugin name you require.

<script>
dayjs.extend(window.dayjs_plugin_isSameOrAfter);
</script>