no-alert

alert, confirm and prompt stop all JavaScript on the page until the user answers, and you can't style the box they show. They're often left over from debugging.

Configure

Off by default. To turn it on:

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

Examples

Reported:

alert("Saved");

if (window.confirm("Delete this file?")) {
  remove(file);
}

Not reported:

showToast("Saved");

if (await dialog.confirm("Delete this file?")) {
  remove(file);
}

Your own function with one of these names is fine:

import { alert } from "./ui/dialogs.js";

alert("Saved");

When not to use it

In Bun, alert, confirm and prompt work in the terminal, which makes them a quick way to ask a question in a command-line script. Turn the rule off for those scripts.