JSF*ck unmimification

[eirnym]

here's alert(1) without evaluation made by JSF*ck project (open website and untick eval)

(![]+[])[+!+[]]+(![]+[])[!+[]+!+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]+(!![]+[])[+[]]+([][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]]+[])[+!+[]+[!+[]+!+[]+!+[]]]+[+!+[]]+([+[]]+![]+[][(![]+[])[+[]]+(![]+[])[!+[]+!+[]]+(![]+[])[+!+[]]+(!![]+[])[+[]]])[!+[]+!+[]+[+[]]]

Example website produce almost correct result as shown below. I've tried to put it as an input to get better result, but this doesn't go any better.

"alert" + ([].flat + [])["13"] + [1] + ("0false" + [].flat)["20"];

With evaluation unmimification have quite a lot of troubles. I know that this could be quite a niche request, but may be you'll have a time to look into.