Plugins: how extend only one instance of dayjs?

I’m evaluating this library for react-day-picker and I have a concern about plugins.

For what I understand, extending dayjs with plugins will affect all the instances of dayjs.

E.g. if I extend dayjs with weekOfYear plugin, the dayjs instances used by an application implementing react-day-picker+dayjs will be extended too. Is it correct? If yes, how to extend just one instance of dayjs?

[gpbl]

Thanks @iamkun for your answer,

I don’t agree much with this design choice. Not that I expect it giving practical problems for now, but an external component using dayjs would alter how dayjs works in the whole app. This doesn’t sound correct to me. What I would have preferred is a factory like:

const dayjs = dayjs.factory();
dayjs.extend(aPlugin); // only this instance of dayjs will use `aPlugin`

Just my feedback! Thanks for your work on dayjs!

[iamkun]

Thanks. To keep only one type of dayjs might be better I think. 😊