noUselessExpressions, no-unused-expressions

[jpike88]

https://eslint.org/docs/latest/rules/no-unused-expressions

Remove lines that don't change the state of anything.

e.g.

const a = 3;
a; // <-- this should cause linting error

[ematipico]

If implemented in Rome, I wouldn't recommend this rule.

Developers often use

A;

To mimic the usage of unused variables.

[jpike88]

While actively developing, yes. But Rome won't get in the way of that, the rule will just act as a reminder to cleanup when finished. That kind of code isn't something desirable to be committed to the main repo branch by passing CI tests...

[Conaclos]

To mimic the usage of unused variables.

This looks like a pattern to escape to a compiler / linter.
In this case, the compiler / linter should be set accordingly.

[ematipico]

For example, the Rust compiler makes those cases with a warning, not an error. I believe it's okay. Eventually, it's up to a minifier/compiler to remove the expressions that don't do anything.