Plugin import in angular project throws error 'no default export'

Describe the bug Plugin import throws error in angular project / browser dayjs__WEBPACK_IMPORTED_MODULE_5__(...).month(...).startOf(...).weekday is not a function

Expected behavior I can use most dayjs functions just fine with import * as dayjs from 'dayjs'.

But when I need to use plugins, I import with import * as weekday from 'dayjs/plugin/weekday, it throws me this error in the browser - even though the compiler recognises the function weekday just fine:

dayjs__WEBPACK_IMPORTED_MODULE_5__(...).month(...).startOf(...).weekday is not a function

Trying to import the weekday plugin with import weekday from 'dayjs/plugin/weekday'; throws compiler error Module '"C:/.../node_modules/dayjs/plugin/weekday"' has no default export.

OR import { weekday } from 'dayjs/plugin/weekday'; throws compiler error Module '"C:/.../node_modules/dayjs/plugin/weekday"' has no exported member

Information

• Day.js Version 1.8.14
• OS: Win 10 / Angular Typescript Project
• Browser Chrome 74

[thomascsd]

Use dayjs.extend, see doc

import * as dayjs from 'dayjs';
import * as weekday from 'dayjs/plugin/weekday';
dayjs.extend(weekday);

[iamkun]

I’ll close this issue since it’s been a while since it’s been opened. Feel free to reopen if you have updates on this