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36 lines
780 B
36 lines
780 B
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const EventEmitter = require('events');
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const e = new EventEmitter();
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e.once('hello', common.mustCall(function(a, b) {}));
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e.emit('hello', 'a', 'b');
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e.emit('hello', 'a', 'b');
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e.emit('hello', 'a', 'b');
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e.emit('hello', 'a', 'b');
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var remove = function() {
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common.fail('once->foo should not be emitted');
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};
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e.once('foo', remove);
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e.removeListener('foo', remove);
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e.emit('foo');
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e.once('e', common.mustCall(function() {
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e.emit('e');
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}));
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e.once('e', common.mustCall(function() {}));
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e.emit('e');
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// Verify that the listener must be a function
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assert.throws(() => {
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const ee = new EventEmitter();
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ee.once('foo', null);
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}, /^TypeError: "listener" argument must be a function$/);
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