JSON.parse call is stripped from the output ( Reproducible )

[thetutlage]

Haven't find any existing issue for same. Sharing the REPL example, where JSON.parse statement has been removed from the code.

Reproduce here

[adrianheine]

This is wrong, but to be expected, since JSON.parse is marked as a pure function.

[lukastaegert]

I agree, maybe marking JSON.parse as pure was wrong since throwing errors is part of its interface. Note that this call is only removed because you are not reusing the result. Still, I think this should be changed and we should add a small test similar to your example so that this use case is not forgotten.

[adrianheine]

JSON.stringify throws on circular structures, so maybe that's not pure either?

[lukastaegert]

I get a feeling there is some thin line here we might cross at some point but yes, I guess you are correct. I think once we implement /*#IMPURE*/ annotations, see #1771 , we might at the same time finally start parsing /*#PURE*/ annotations so that people can make their JSON interactions tree-shakeable again.