question about eval

[Violet-Bora-Lee]

Hi, im translating the article related to eval.

I'm confusing this sentence.

Code minifiers (tools used before JS gets to production, to compress it) replace local variables with shorter ones for optimization. That's usually safe, but not if eval is used, as it may reference them. So minifiers don't replace all local variables that might be visible from eval. That negatively affects code compression ratio.

Could you specify what it means and them means?

[iliakan]

Rewritten thanks.

[CreatiCoding]

Code minifiers (tools used before JS gets to production, to compress it) replace local
variables with shorter ones for optimization. That's usually safe, but not if eval is
used, as it may reference them. So minifiers don't replace all local variables that
might be visible from eval. That negatively affects code compression ratio.

Is it mean that Code minifiers don't replace local variables from eval?

[iliakan]

No