Allow async listeners in the TypeScript types #70
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This is on top of #69.
Emittery already supports awaiting event emission, which in turn awaits all the listeners that return a Promise. If a caller awaits
emit
, all the listeners will have resolved by the time the outer promise resolves, which is great!This adds a test for that behaviour, and updates the TypeScript types to support these async listeners. There's no new or changed behaviour.