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module.exports = function createEventEmitterProxy (eventEmitter, listeners) {
let target = eventEmitter
const eventHandlers = listeners || {}
const proxy = new Proxy({}, {
get: (obj, name) => {
// intercept listeners
if (name === 'on') return addListener
if (name === 'setTarget') return setTarget
if (name === 'proxyEventHandlers') return eventHandlers
return target[name]
},
set: (obj, name, value) => {
target[name] = value
return true
},
})
function setTarget (eventEmitter) {
target = eventEmitter
// migrate listeners
Object.keys(eventHandlers).forEach((name) => {
eventHandlers[name].forEach((handler) => target.on(name, handler))
})
}
function addListener (name, handler) {
if (!eventHandlers[name]) eventHandlers[name] = []
eventHandlers[name].push(handler)
target.on(name, handler)
}
if (listeners) proxy.setTarget(eventEmitter)
return proxy
}
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