JavaScript one-liner puzzle: throw an error without using throw

Write a function that throws an error. Contstraints:

• do not use throw
• one line only
• simply returning an Error is not sufficient (since it's not thrown)
• function declaration must not throw the error, only execution should throw
• Syntax error is not allowed!
• max. ovarall characters for the code: 15

Tips:

• the function is not something you should ever use in your code
• think of fundamentals and what you learned about them
• it's marked #beginners, because it's way easier than you might think
• you can make pretty weird things with JavaScript

Comments

[Pascal Thormeier]

Uuh, love me some code golf!

Shortest implementation of any error I could think of would be something like this:

let e=_=>_._

12 characters.

And then using it like so:

try {
  e()
} catch (err) {
  console.warn('error thrown', err)
}

Throws Cannot read properties of undefined (reading '_'), though there's no error if the function receives an object as argument with _ defined.

[Jan Küster 🔥]

Without depending on the input but more lines

Spoiler

const f=()=>f=0