'use strict';
var common = require('./common');
var EventEmitter = require('../');
var assert = require('assert');
var myEE = new EventEmitter();
var m = 0;
myEE.on('foo', common.mustCall(function () {
assert.strictEqual(m, 2);
}));
myEE.prependListener('foo', common.mustCall(function () {
assert.strictEqual(m++, 1);
}));
myEE.prependOnceListener('foo',
common.mustCall(function () {
assert.strictEqual(m++, 0);
}));
myEE.emit('foo');
assert.throws(function () {
var ee = new EventEmitter();
ee.prependOnceListener('foo', null);
}, 'TypeError: The "listener" argument must be of type Function. Received type object');