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const EventEmitter = require('events'); const myEmitter = new EventEmitter(); // Default behavior: listeners execute in order they were added myEmitter.on('event', () => console.log('First listener')); myEmitter.on('event', () => console.log('Second listener')); // Prepend a listener (it will execute first) myEmitter.prependListener('event', () => console.log('Prepended listener')); // One-time prepended listener myEmitter.prependOnceListener('event', () => console.log('Prepended once listener')); // Emit the event myEmitter.emit('event'); // Output will be: // Prepended once listener // Prepended listener // First listener // Second listener
Prepended once listener Prepended listener First listener Second listener
