How are frameworks created?

Question

Frameworks

What are frameworks like React made of? How to create it? If possible, then in detail, what do you need to know to do this, what technologies are used, what does the framework consist of at the file level?

Answer 1

1. Code
2. Documentation
3. Red-eyed fanatics
In general, any framework simplifies tasks, as it were. Therefore, you are working on something, and you understand that you are copy-pasting this code from project to project. An idea arises, and not to zababahat something that we will use?
Formulate thoughts and do. Although it is desirable, of course, to first write the documentation, and then adjust the code to fit it.

Answer 2

Here a person writes a self-written framework from scratch, along the way explaining what's what: https://www.youtube.com/watch?v=w4iqxN0nfTs&t