Most code I see here should be

const

, not

var

or

let

How do you understand this

const rec=context.record;
rec.setValue(...);

const variables cannot be reassigned, but const does not mean immutable

Yes, I understand that, just point to an confused situation (at least for me)... Don't get me wrong, since 2.1 I usually use const for record object. But, sometimes I like to make difference between "read-only" constant and variable objects. I agree with @Shawn Talbert most suitescriot code could be const instead let and var

just use eslint 🤷‍♂️ https://eslint.org/docs/rules/no-var https://eslint.org/docs/rules/prefer-const