why used 'let' instead of 'const'

[jin-Pro]

hello, thanks for offer this library.

I'm studying React component architecture. Reading this library component code.

so, I have a question.

Non-'const' in all component files, not just the headlessui-react/src/components/popover/popover.tsx#L178 link Why use 'let'

tell me the reason please. I dont understand

Thank you