[Pattern 🤔] Unknown enum-like pattern

[pionxzh]

I noticed a pattern that looks like an enum but is much simpler. And TS Enum does not support boolean as the value.

The code was probably generated by some tools, as most people shouldn't write code like this.

Not sure what's this 🤔

var n =
  ((a = {}),
  (a[34] = true),
  (a[20] = true),
  (a[31] = true),
  (a[22] = true),
  (a[71] = true),
  a
);

[0xdevalias]

I noticed a pattern that looks like an enum but is much simpler.

@pionxzh Curious if you have seen this come up multiple times? And if so, if you have any larger examples of it (where we could explore the surrounding code/usages to try and determine the origin)

[pionxzh]

I only saw this pattern in 1 script. I'm afraid that I couldn't share that script content here. Let me try extracting the critical part.