Dayjs DatePicker doesn't respect Day.js locale from Config Provider (nextjs)

• [ v] I have searched the issues of this repository and believe that this is not a duplicate.

Related but doesn’t work for me: https://github.com/ant-design/ant-design/issues/27815

Reproduction link

https://github.com/chemicalkosek/antd-dayjs-next

Steps to reproduce

1. Clone repository
2. Launch with npm run dev
3. See that the Datepicker with inline locale setup works. The other one doesn’t respect the ConfigProvider (or actually the days locale)
4. If without stopping the dev server I change lib to es in the line:

import generatePicker from "antd/lib/date-picker/generatePicker";

to:

import generatePicker from "antd/es/date-picker/generatePicker";

I can see now with hot refresh that it works! All the week names etc are in pl locale. But If I refresh the page or stop the dev server and run again npm run dev (or build to production), I’l get the following error:

/home/maciek/Dokumenty/websites/antd-dayjs-next/node_modules/antd/es/date-picker/generatePicker/index.js:1
import _extends from "@babel/runtime/helpers/esm/extends";
^^^^^^

SyntaxError: Cannot use import statement outside a module
    at wrapSafe (internal/modules/cjs/loader.js:979:16)
    at Module._compile (internal/modules/cjs/loader.js:1027:27)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
    at Module.load (internal/modules/cjs/loader.js:928:32)
    at Function.Module._load (internal/modules/cjs/loader.js:769:14)
    at Module.require (internal/modules/cjs/loader.js:952:19)
    at require (internal/modules/cjs/helpers.js:88:18)
    at eval (webpack-internal:///antd/es/date-picker/generatePicker:1:18)
    at Object.antd/es/date-picker/generatePicker (/home/maciek/Dokumenty/websites/antd-dayjs-next/.next/server/pages/index.js:149:1)
    at __webpack_require__ (/home/maciek/Dokumenty/websites/antd-dayjs-next/.next/server/pages/index.js:23:31)
    at eval (webpack-internal:///./components/DayjsDatePicker.js:4:92)
    at Module../components/DayjsDatePicker.js (/home/maciek/Dokumenty/websites/antd-dayjs-next/.next/server/pages/index.js:104:1)
    at __webpack_require__ (/home/maciek/Dokumenty/websites/antd-dayjs-next/.next/server/pages/index.js:23:31)
    at eval (webpack-internal:///./pages/index.js:9:85)
    at Module../pages/index.js (/home/maciek/Dokumenty/websites/antd-dayjs-next/.next/server/pages/index.js:127:1)
    at __webpack_require__ (/home/maciek/Dokumenty/websites/antd-dayjs-next/.next/server/pages/index.js:23:31)

What is expected?

The dayjs locale works in dayjs Date Picker

What is actually happening?

The default english dayjs locale is seen

Environment	Info
antd	4.14.1
React	17.0.2
System	Ubuntu 20.04
Browser	Chrome 89

[GVanderLugt]

Any updates here?

[nbusuttil]

Up