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module.exports = value => { | |
const listeners = new Set(); | |
const etter = (...args) => { | |
switch(args.length) { | |
case 0: return value; | |
case 1: { | |
value = args[0]; | |
listeners.forEach(listener => listener(value)); | |
} | |
} | |
}; | |
etter.listeners = listeners; | |
etter.subscribe = listener => { | |
listeners.add(listener); | |
return etter; | |
}; | |
etter.unsubscribe = listener => { | |
if(listener) { | |
listeners.delete(listener); | |
} else { | |
listeners.clear(); | |
} | |
return etter; | |
}; | |
return etter; | |
} |
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