1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
// deno-fmt-ignore-file// deno-lint-ignore-file
// Copyright Joyent and Node contributors. All rights reserved. MIT license.// Taken from Node 18.12.1// This file is automatically generated by "node/_tools/setup.ts". Do not modify this file manually
'use strict';
const common = require('../common');const dc = require('diagnostics_channel');const assert = require('assert');const { Channel } = dc;
const name = 'test';const input = {  foo: 'bar'};
// Individual channel objects can be created to avoid future lookupsconst channel = dc.channel(name);assert.ok(channel instanceof Channel);
// No subscribers yet, should not publishassert.ok(!channel.hasSubscribers);
const subscriber = common.mustCall((message, name) => {  assert.strictEqual(name, channel.name);  assert.deepStrictEqual(message, input);});
// Now there's a subscriber, should publishdc.subscribe(name, subscriber);assert.ok(channel.hasSubscribers);
// The ActiveChannel prototype swap should not fail instanceofassert.ok(channel instanceof Channel);
// Should trigger the subscriber oncechannel.publish(input);
// Should not publish after subscriber is unsubscribedassert.ok(dc.unsubscribe(name, subscriber));assert.ok(!channel.hasSubscribers);
// unsubscribe() should return false when subscriber is not foundassert.ok(!dc.unsubscribe(name, subscriber));
assert.throws(() => {  dc.subscribe(name, null);}, { code: 'ERR_INVALID_ARG_TYPE' });