d0e8d36c33
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28 lines
754 B
JavaScript
28 lines
754 B
JavaScript
'use strict';
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function inheritEvents(source, target, events) {
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const listeners = {};
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target
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.on('newListener', (eventName) => {
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if (events.indexOf(eventName) >= 0 && !target.listenerCount(eventName)) {
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source.on(
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eventName,
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(listeners[eventName] = function () {
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const args = [].slice.call(arguments);
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args.unshift(eventName);
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target.emit.apply(target, args);
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}),
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);
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}
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})
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.on('removeListener', (eventName) => {
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if (events.indexOf(eventName) >= 0 && !target.listenerCount(eventName)) {
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source.removeListener(eventName, listeners[eventName]);
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delete listeners[eventName];
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}
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});
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}
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module.exports = inheritEvents;
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