A little confused with converting symbol to 'DOMString'

[hikerpig]

When unit testing with jest I get a TypeError, so I dug into this line

    if (typeof V === "symbol") {
        throw new TypeError(_("is a symbol, which cannot be converted to a string", opts));
    }

In ecma-262 spec, there is Symbol.prototype.toString() method, it seems to me that convertion from Symbol to String should not raise a Error.

Would you be kind enough to explain this?

[domenic]

There are many ways to convert things to a string. However, the Web IDL spec, which this library implements, chooses one of them: https://heycam.github.io/webidl/#es-DOMString step 2. That should provide the answer.

[hikerpig]

Thank you, I think maybe I should do a little patching an wrapping in my own code