Package Exports

modify-error-event

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (modify-error-event) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

modify-error-event

Modify the value of the specific object's error event

var EventEmitter = require('events').EventEmitter;
var modifyErrorEvent = require('modify-error-event');

var emitter = new EventEmitter();

modifyErrorEvent(emitter, function(err) {
  err.message = 'bar';
  return err;
});

emitter.on('error', function(err) {
  err.message; //=> 'bar'
});

emitter.emit('error', new Error('foo'));

Installation

Use npm.

npm install modify-error-event

API

var modifyErrorEvent = require('modify-error-event');

modifyErrorEvent(eventEmitter, modifier)

eventEmitter: Object (an instance of EventEmitter or its inheritance e.g. Stream)
modifier: Function
Return: Object (Same as the first argument)

It changes the first argument of the error event listeners in response to the return value of the modifier function.

var EventEmitter = require('events').EventEmitter;
var modifyErrorEvent = require('modify-error-event');

var emitter = new EventEmitter();

modifyErrorEvent(emitter, function(err) {
  err.message += 'b';
  return err;
});

modifyErrorEvent(emitter, function(val) {
  err.message += 'c';
  return err;
});

emitter
.on('error', listener)
.emit('error', new Error('a'));

function listener(err) {
  err.message; //=> 'abc'
}

License

Licensed under the MIT License.