It might be something wrong with ".gitignore"

[wzhqwq]

Firstly, I'm a newbie in computer science.
Although I don't know why "paper.js" is moved to "third_party", it lost its "dist" folder, which blocks building progress.
If replace "dist/" with "/dist/" in ".gitignore" and repair the folder, command "yarn" can finish successfully.

Sorry for my poor English.