no-new

new Thing() as a standalone statement creates an object and throws it away. Either a variable is missing, or the constructor is only called for its side effects. In that case a plain function says so more clearly.

Configure

Off by default. To turn it on:

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

Examples

Reported:

new Router(routes);

Not reported:

const router = new Router(routes);

startRouter(routes);

When not to use it

Some libraries start working from the constructor, for example new Vue({ el: "#app" }). If you use one, disable the rule on that line or turn it off.