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57 lines
1.8 KiB
57 lines
1.8 KiB
// Copyright Joyent, Inc. and other Node contributors.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to permit
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// persons to whom the Software is furnished to do so, subject to the
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// following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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// USE OR OTHER DEALINGS IN THE SOFTWARE.
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'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());
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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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const remove = function() {
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assert.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());
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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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