Some template literals types will break the generator

[SamuelCharpentier]

As soon as you use a "wildcard" in a template literal string like `${string}`, the generator breaks down.

For example, if you have an email type like this:

type Email = `${string}@${string}.${string}`

the generated typeguard looks like this:

import { Email } from "./Email";

export function Email(obj: any, _argumentName?: string): obj is Email {
    return (
        typeof obj === "`${string}@${string}.${string}`"
    )
}

and that don't work as the typeof obj would be "string".

[rhys-vdw]

Oh yeah, that's a non-trivial fix. This project was created before template literal types were a thing. We'd need some sort of regex validator to do it properly, but for now falling back to a regular string check and logging an error would be best.

I'll accept a PR that provides either fix.

[elliot-huffman]

After researching this, I don't think a complex validator is necessary. All template strings are always string in the typeof key word. Even if the values are null, undefined, numbers, objects, etc. in the template string itself. I think it is safe to set the logic to the following: "If a template string is detected, validate the stored type is a string."

I think validating the content of the string would be where the regex is necessary, the object type (contain of the string content) will always be string though.