How to create new Entities with JS?

[Devel]

Hello!
Can you show examples of code for creating new entities with JS?
I mean objects of existing entites.

[tanya]

https://github.com/espocrm/espocrm/blob/master/client/modules/crm/src/views/lead/convert.js#L66

https://github.com/espocrm/espocrm/blob/master/client/src/views/record/base.js#L472