Re: [heycam/webidl] add a type to represent the undefined value (#60)

It's possible that the needs of TypeScript and Web IDL diverge, and that's OK. Web IDL intends to model JavaScript, where functions that don't return anything, return `undefined`.

There is no distinction in JavaScript between functions that "actually _don't_ return anything" vs. "returning `undefined`", and so we won't make such a distinction in Web IDL.

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