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Fix Typescript wildcard handler #76

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merged 3 commits into from
Sep 19, 2018

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zbuttram
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@zbuttram zbuttram commented Jun 22, 2018

Currently the below example will generate an error from Typescript since the Handler type is used for all calls to .on and .off and the Handler signature does not allow for the event type as the first parameter.

import mitt from "mitt";

const emitter = new mitt();

function listenAll(callback: (type: string, event: any) => void) {
	emitter.on('*', callback);
	return () => emitter.off('*', callback);
}

I have introduced a WildcardHandler type that is expected when the first argument to .on or .off is '*'.

It looks like this is already fixed in the Flow types, but Typescript still has the issue.

@anru
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anru commented Jun 29, 2018

hi @zbuttram, thanks for PR, I've merged it in my fork under emitt package

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@developit developit left a comment

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Great! Thanks.

@developit developit merged commit d08d782 into developit:master Sep 19, 2018
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3 participants