no-new-wrappers

With new, String, Number and Boolean return an object that wraps the value, not the value itself. typeof new String("a") is "object", new Number(1) === 1 is false, and new Boolean(false) is truthy, so the if below always runs.

Without new, the same functions convert a value and return a plain string, number or boolean.

With an oxlint config, --fix rewrites new String("Ada") to "Ada" and new Number(input) to Number(input).

Configure

Off by default. To turn it on:

[lint.rules]
"no-new-wrappers" = "error" # or "warn"

Examples

Reported:

const enabled = new Boolean(false);

if (enabled) {
  start();
}

const name = new String("Ada");
const port = new Number(input);

Not reported:

const enabled = false;
const name = "Ada";
const port = Number(input);