What coding language do the Blocks most closely mimic?

Questions about Thunkable
1

I know that the blocks are eventually converted to the appropriate coding language for android and ios, but for those “actual coders” out there… which coding language (syntax) do the blocks in Thunkable mimic most closely?

Thanks!

2

In a tutorial from darren,
I heard that Thunkable x is built in “React Native”.
However, blocks can be a mixture of javascript,Html etc.