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

**TypeScript** [uses `void`](https://www.typescriptlang.org/docs/handbook/basic-types.html#void) in ways other than `undefined`, **e.g.:** [`this: void` in function definitions](https://www.typescriptlang.org/docs/handbook/functions.html#this-parameters-in-callbacks) or trailing `void` parameters being treated as optional.

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