Last change
on this file since 59329aa was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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Property mode
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100644
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File size:
833 bytes
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[6a3a178] | 1 | 'use strict';
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| 2 |
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| 3 | var common = require('./common');
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| 4 | var EventEmitter = require('../');
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| 5 | var assert = require('assert');
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| 6 |
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| 7 | var myEE = new EventEmitter();
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| 8 | var m = 0;
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| 9 | // This one comes last.
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| 10 | myEE.on('foo', common.mustCall(function () {
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| 11 | assert.strictEqual(m, 2);
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| 12 | }));
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| 13 |
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| 14 | // This one comes second.
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| 15 | myEE.prependListener('foo', common.mustCall(function () {
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| 16 | assert.strictEqual(m++, 1);
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| 17 | }));
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| 18 |
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| 19 | // This one comes first.
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| 20 | myEE.prependOnceListener('foo',
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| 21 | common.mustCall(function () {
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| 22 | assert.strictEqual(m++, 0);
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| 23 | }));
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| 24 |
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| 25 | myEE.emit('foo');
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| 26 |
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| 27 | // Verify that the listener must be a function
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| 28 | assert.throws(function () {
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| 29 | var ee = new EventEmitter();
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| 30 | ee.prependOnceListener('foo', null);
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| 31 | }, 'TypeError: The "listener" argument must be of type Function. Received type object');
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