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      <details role="navigation" id="toc" open><summary>Table of contents</summary><ul>
<li><span class="stability_1"><a href="#trace-events">Trace events</a></span>
<ul>
<li><a href="#the-nodetrace_events-module">The <code>node:trace_events</code> module</a>
<ul>
<li><a href="#tracing-object"><code>Tracing</code> object</a>
<ul>
<li><a href="#tracingcategories"><code>tracing.categories</code></a></li>
<li><a href="#tracingdisable"><code>tracing.disable()</code></a></li>
<li><a href="#tracingenable"><code>tracing.enable()</code></a></li>
<li><a href="#tracingenabled"><code>tracing.enabled</code></a></li>
</ul>
</li>
<li><a href="#trace_eventscreatetracingoptions"><code>trace_events.createTracing(options)</code></a></li>
<li><a href="#trace_eventsgetenabledcategories"><code>trace_events.getEnabledCategories()</code></a></li>
</ul>
</li>
<li><a href="#examples">Examples</a>
<ul>
<li><a href="#collect-trace-events-data-by-inspector">Collect trace events data by inspector</a></li>
</ul>
</li>
</ul>
</li>
</ul></details>

      <div role="main" id="apicontent">
        <h2>Trace events<span><a class="mark" href="#trace-events" id="trace-events">#</a></span><a aria-hidden="true" class="legacy" id="tracing_trace_events"></a></h2>

<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental</div><p></p>
<p><strong>Source Code:</strong> <a href="https://github.com/nodejs/node/blob/v22.22.0/lib/trace_events.js">lib/trace_events.js</a></p>
<p>The <code>node:trace_events</code> module provides a mechanism to centralize tracing
information generated by V8, Node.js core, and userspace code.</p>
<p>Tracing can be enabled with the <code>--trace-event-categories</code> command-line flag
or by using the <code>node:trace_events</code> module. The <code>--trace-event-categories</code> flag
accepts a list of comma-separated category names.</p>
<p>The available categories are:</p>
<ul>
<li><code>node</code>: An empty placeholder.</li>
<li><code>node.async_hooks</code>: Enables capture of detailed <a href="async_hooks.html"><code>async_hooks</code></a> trace data.
The <a href="async_hooks.html"><code>async_hooks</code></a> events have a unique <code>asyncId</code> and a special <code>triggerId</code>
<code>triggerAsyncId</code> property.</li>
<li><code>node.bootstrap</code>: Enables capture of Node.js bootstrap milestones.</li>
<li><code>node.console</code>: Enables capture of <code>console.time()</code> and <code>console.count()</code>
output.</li>
<li><code>node.threadpoolwork.sync</code>: Enables capture of trace data for threadpool
synchronous operations, such as <code>blob</code>, <code>zlib</code>, <code>crypto</code> and <code>node_api</code>.</li>
<li><code>node.threadpoolwork.async</code>: Enables capture of trace data for threadpool
asynchronous operations, such as <code>blob</code>, <code>zlib</code>, <code>crypto</code> and <code>node_api</code>.</li>
<li><code>node.dns.native</code>: Enables capture of trace data for DNS queries.</li>
<li><code>node.net.native</code>: Enables capture of trace data for network.</li>
<li><code>node.environment</code>: Enables capture of Node.js Environment milestones.</li>
<li><code>node.fs.sync</code>: Enables capture of trace data for file system sync methods.</li>
<li><code>node.fs_dir.sync</code>: Enables capture of trace data for file system sync
directory methods.</li>
<li><code>node.fs.async</code>: Enables capture of trace data for file system async methods.</li>
<li><code>node.fs_dir.async</code>: Enables capture of trace data for file system async
directory methods.</li>
<li><code>node.perf</code>: Enables capture of <a href="perf_hooks.html">Performance API</a> measurements.
<ul>
<li><code>node.perf.usertiming</code>: Enables capture of only Performance API User Timing
measures and marks.</li>
<li><code>node.perf.timerify</code>: Enables capture of only Performance API timerify
measurements.</li>
</ul>
</li>
<li><code>node.promises.rejections</code>: Enables capture of trace data tracking the number
of unhandled Promise rejections and handled-after-rejections.</li>
<li><code>node.vm.script</code>: Enables capture of trace data for the <code>node:vm</code> module's
<code>runInNewContext()</code>, <code>runInContext()</code>, and <code>runInThisContext()</code> methods.</li>
<li><code>v8</code>: The <a href="v8.html">V8</a> events are GC, compiling, and execution related.</li>
<li><code>node.http</code>: Enables capture of trace data for http request / response.</li>
<li><code>node.module_timer</code>: Enables capture of trace data for CJS Module loading.</li>
</ul>
<p>By default the <code>node</code>, <code>node.async_hooks</code>, and <code>v8</code> categories are enabled.</p>
<pre><code class="language-bash">node --trace-event-categories v8,node,node.async_hooks server.js</code> <button class="copy-button">copy</button></pre>
<p>Prior versions of Node.js required the use of the <code>--trace-events-enabled</code>
flag to enable trace events. This requirement has been removed. However, the
<code>--trace-events-enabled</code> flag <em>may</em> still be used and will enable the
<code>node</code>, <code>node.async_hooks</code>, and <code>v8</code> trace event categories by default.</p>
<pre><code class="language-bash">node --trace-events-enabled

<span class="hljs-comment"># is equivalent to</span>

node --trace-event-categories v8,node,node.async_hooks</code> <button class="copy-button">copy</button></pre>
<p>Alternatively, trace events may be enabled using the <code>node:trace_events</code> module:</p>

<pre class="with-61-chars"><input class="js-flavor-toggle" type="checkbox" checked aria-label="Show modern ES modules syntax"><code class="language-js mjs"><span class="hljs-keyword">import</span> { createTracing } <span class="hljs-keyword">from</span> <span class="hljs-string">'node:trace_events'</span>;
<span class="hljs-keyword">const</span> tracing = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'node.perf'</span>] });
tracing.<span class="hljs-title function_">enable</span>();  <span class="hljs-comment">// Enable trace event capture for the 'node.perf' category</span>

<span class="hljs-comment">// do work</span>

tracing.<span class="hljs-title function_">disable</span>();  <span class="hljs-comment">// Disable trace event capture for the 'node.perf' category</span></code><code class="language-js cjs"><span class="hljs-keyword">const</span> { createTracing } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:trace_events'</span>);
<span class="hljs-keyword">const</span> tracing = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'node.perf'</span>] });
tracing.<span class="hljs-title function_">enable</span>();  <span class="hljs-comment">// Enable trace event capture for the 'node.perf' category</span>

<span class="hljs-comment">// do work</span>

tracing.<span class="hljs-title function_">disable</span>();  <span class="hljs-comment">// Disable trace event capture for the 'node.perf' category</span></code><button class="copy-button">copy</button></pre>
<p>Running Node.js with tracing enabled will produce log files that can be opened
in the <a href="https://www.chromium.org/developers/how-tos/trace-event-profiling-tool"><code>chrome://tracing</code></a>
tab of Chrome.</p>
<p>The logging file is by default called <code>node_trace.${rotation}.log</code>, where
<code>${rotation}</code> is an incrementing log-rotation id. The filepath pattern can
be specified with <code>--trace-event-file-pattern</code> that accepts a template
string that supports <code>${rotation}</code> and <code>${pid}</code>:</p>
<pre><code class="language-bash">node --trace-event-categories v8 --trace-event-file-pattern <span class="hljs-string">'${pid}-${rotation}.log'</span> server.js</code> <button class="copy-button">copy</button></pre>
<p>To guarantee that the log file is properly generated after signal events like
<code>SIGINT</code>, <code>SIGTERM</code>, or <code>SIGBREAK</code>, make sure to have the appropriate handlers
in your code, such as:</p>
<pre><code class="language-js">process.<span class="hljs-title function_">on</span>(<span class="hljs-string">'SIGINT'</span>, <span class="hljs-keyword">function</span> <span class="hljs-title function_">onSigint</span>(<span class="hljs-params"></span>) {
  <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">info</span>(<span class="hljs-string">'Received SIGINT.'</span>);
  process.<span class="hljs-title function_">exit</span>(<span class="hljs-number">130</span>);  <span class="hljs-comment">// Or applicable exit code depending on OS and signal</span>
});</code> <button class="copy-button">copy</button></pre>
<p>The tracing system uses the same time source
as the one used by <code>process.hrtime()</code>.
However the trace-event timestamps are expressed in microseconds,
unlike <code>process.hrtime()</code> which returns nanoseconds.</p>
<p>The features from this module are not available in <a href="worker_threads.html#class-worker"><code>Worker</code></a> threads.</p>
<section><h3>The <code>node:trace_events</code> module<span><a class="mark" href="#the-nodetrace_events-module" id="the-nodetrace_events-module">#</a></span><a aria-hidden="true" class="legacy" id="tracing_the_node_trace_events_module"></a></h3>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<div>
<h4><code>Tracing</code> object<span><a class="mark" href="#tracing-object" id="tracing-object">#</a></span><a aria-hidden="true" class="legacy" id="tracing_tracing_object"></a></h4>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<p>The <code>Tracing</code> object is used to enable or disable tracing for sets of
categories. Instances are created using the <code>trace_events.createTracing()</code>
method.</p>
<p>When created, the <code>Tracing</code> object is disabled. Calling the
<code>tracing.enable()</code> method adds the categories to the set of enabled trace event
categories. Calling <code>tracing.disable()</code> will remove the categories from the
set of enabled trace event categories.</p>
<div>
<h5><code>tracing.categories</code><span><a class="mark" href="#tracingcategories" id="tracingcategories">#</a></span><a aria-hidden="true" class="legacy" id="tracing_tracing_categories"></a></h5>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<ul>
<li>Type: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type">&#x3C;string></a></li>
</ul>
<p>A comma-separated list of the trace event categories covered by this
<code>Tracing</code> object.</p>
</div><div>
<h5><code>tracing.disable()</code><span><a class="mark" href="#tracingdisable" id="tracingdisable">#</a></span><a aria-hidden="true" class="legacy" id="tracing_tracing_disable"></a></h5>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<p>Disables this <code>Tracing</code> object.</p>
<p>Only trace event categories <em>not</em> covered by other enabled <code>Tracing</code> objects
and <em>not</em> specified by the <code>--trace-event-categories</code> flag will be disabled.</p>

<pre class="with-77-chars"><input class="js-flavor-toggle" type="checkbox" checked aria-label="Show modern ES modules syntax"><code class="language-js mjs"><span class="hljs-keyword">import</span> { createTracing, getEnabledCategories } <span class="hljs-keyword">from</span> <span class="hljs-string">'node:trace_events'</span>;
<span class="hljs-keyword">const</span> t1 = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'node'</span>, <span class="hljs-string">'v8'</span>] });
<span class="hljs-keyword">const</span> t2 = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'node.perf'</span>, <span class="hljs-string">'node'</span>] });
t1.<span class="hljs-title function_">enable</span>();
t2.<span class="hljs-title function_">enable</span>();

<span class="hljs-comment">// Prints 'node,node.perf,v8'</span>
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-title function_">getEnabledCategories</span>());

t2.<span class="hljs-title function_">disable</span>(); <span class="hljs-comment">// Will only disable emission of the 'node.perf' category</span>

<span class="hljs-comment">// Prints 'node,v8'</span>
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-title function_">getEnabledCategories</span>());</code><code class="language-js cjs"><span class="hljs-keyword">const</span> { createTracing, getEnabledCategories } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:trace_events'</span>);
<span class="hljs-keyword">const</span> t1 = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'node'</span>, <span class="hljs-string">'v8'</span>] });
<span class="hljs-keyword">const</span> t2 = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'node.perf'</span>, <span class="hljs-string">'node'</span>] });
t1.<span class="hljs-title function_">enable</span>();
t2.<span class="hljs-title function_">enable</span>();

<span class="hljs-comment">// Prints 'node,node.perf,v8'</span>
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-title function_">getEnabledCategories</span>());

t2.<span class="hljs-title function_">disable</span>(); <span class="hljs-comment">// Will only disable emission of the 'node.perf' category</span>

<span class="hljs-comment">// Prints 'node,v8'</span>
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-title function_">getEnabledCategories</span>());</code><button class="copy-button">copy</button></pre>
</div><div>
<h5><code>tracing.enable()</code><span><a class="mark" href="#tracingenable" id="tracingenable">#</a></span><a aria-hidden="true" class="legacy" id="tracing_tracing_enable"></a></h5>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<p>Enables this <code>Tracing</code> object for the set of categories covered by the
<code>Tracing</code> object.</p>
</div><div>
<h5><code>tracing.enabled</code><span><a class="mark" href="#tracingenabled" id="tracingenabled">#</a></span><a aria-hidden="true" class="legacy" id="tracing_tracing_enabled"></a></h5>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<ul>
<li>Type: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type">&#x3C;boolean></a> <code>true</code> only if the <code>Tracing</code> object has been enabled.</li>
</ul>
</div></div><div>
<h4><code>trace_events.createTracing(options)</code><span><a class="mark" href="#trace_eventscreatetracingoptions" id="trace_eventscreatetracingoptions">#</a></span><a aria-hidden="true" class="legacy" id="tracing_trace_events_createtracing_options"></a></h4>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<ul>
<li><code>options</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type">&#x3C;Object></a>
<ul>
<li><code>categories</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type">&#x3C;string[]></a> An array of trace category names. Values included
in the array are coerced to a string when possible. An error will be
thrown if the value cannot be coerced.</li>
</ul>
</li>
<li>Returns: <a href="tracing.html#tracing-object" class="type">&#x3C;Tracing></a>.</li>
</ul>
<p>Creates and returns a <code>Tracing</code> object for the given set of <code>categories</code>.</p>

<pre class="with-55-chars"><input class="js-flavor-toggle" type="checkbox" checked aria-label="Show modern ES modules syntax"><code class="language-js mjs"><span class="hljs-keyword">import</span> { createTracing } <span class="hljs-keyword">from</span> <span class="hljs-string">'node:trace_events'</span>;
<span class="hljs-keyword">const</span> categories = [<span class="hljs-string">'node.perf'</span>, <span class="hljs-string">'node.async_hooks'</span>];
<span class="hljs-keyword">const</span> tracing = <span class="hljs-title function_">createTracing</span>({ categories });
tracing.<span class="hljs-title function_">enable</span>();
<span class="hljs-comment">// do stuff</span>
tracing.<span class="hljs-title function_">disable</span>();</code><code class="language-js cjs"><span class="hljs-keyword">const</span> { createTracing } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:trace_events'</span>);
<span class="hljs-keyword">const</span> categories = [<span class="hljs-string">'node.perf'</span>, <span class="hljs-string">'node.async_hooks'</span>];
<span class="hljs-keyword">const</span> tracing = <span class="hljs-title function_">createTracing</span>({ categories });
tracing.<span class="hljs-title function_">enable</span>();
<span class="hljs-comment">// do stuff</span>
tracing.<span class="hljs-title function_">disable</span>();</code><button class="copy-button">copy</button></pre>
</div><div>
<h4><code>trace_events.getEnabledCategories()</code><span><a class="mark" href="#trace_eventsgetenabledcategories" id="trace_eventsgetenabledcategories">#</a></span><a aria-hidden="true" class="legacy" id="tracing_trace_events_getenabledcategories"></a></h4>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<ul>
<li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type">&#x3C;string></a></li>
</ul>
<p>Returns a comma-separated list of all currently-enabled trace event
categories. The current set of enabled trace event categories is determined
by the <em>union</em> of all currently-enabled <code>Tracing</code> objects and any categories
enabled using the <code>--trace-event-categories</code> flag.</p>
<p>Given the file <code>test.js</code> below, the command
<code>node --trace-event-categories node.perf test.js</code> will print
<code>'node.async_hooks,node.perf'</code> to the console.</p>

<pre class="with-77-chars"><input class="js-flavor-toggle" type="checkbox" checked aria-label="Show modern ES modules syntax"><code class="language-js mjs"><span class="hljs-keyword">import</span> { createTracing, getEnabledCategories } <span class="hljs-keyword">from</span> <span class="hljs-string">'node:trace_events'</span>;
<span class="hljs-keyword">const</span> t1 = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'node.async_hooks'</span>] });
<span class="hljs-keyword">const</span> t2 = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'node.perf'</span>] });
<span class="hljs-keyword">const</span> t3 = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'v8'</span>] });

t1.<span class="hljs-title function_">enable</span>();
t2.<span class="hljs-title function_">enable</span>();

<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-title function_">getEnabledCategories</span>());</code><code class="language-js cjs"><span class="hljs-keyword">const</span> { createTracing, getEnabledCategories } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:trace_events'</span>);
<span class="hljs-keyword">const</span> t1 = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'node.async_hooks'</span>] });
<span class="hljs-keyword">const</span> t2 = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'node.perf'</span>] });
<span class="hljs-keyword">const</span> t3 = <span class="hljs-title function_">createTracing</span>({ <span class="hljs-attr">categories</span>: [<span class="hljs-string">'v8'</span>] });

t1.<span class="hljs-title function_">enable</span>();
t2.<span class="hljs-title function_">enable</span>();

<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-title function_">getEnabledCategories</span>());</code><button class="copy-button">copy</button></pre>
</div>
</section><section><h3>Examples<span><a class="mark" href="#examples" id="examples">#</a></span><a aria-hidden="true" class="legacy" id="tracing_examples"></a></h3>
<div>
<h4>Collect trace events data by inspector<span><a class="mark" href="#collect-trace-events-data-by-inspector" id="collect-trace-events-data-by-inspector">#</a></span><a aria-hidden="true" class="legacy" id="tracing_collect_trace_events_data_by_inspector"></a></h4>

<pre class="with-41-chars"><input class="js-flavor-toggle" type="checkbox" checked aria-label="Show modern ES modules syntax"><code class="language-js mjs"><span class="hljs-keyword">import</span> { <span class="hljs-title class_">Session</span> } <span class="hljs-keyword">from</span> <span class="hljs-string">'node:inspector'</span>;
<span class="hljs-keyword">const</span> session = <span class="hljs-keyword">new</span> <span class="hljs-title class_">Session</span>();
session.<span class="hljs-title function_">connect</span>();

<span class="hljs-keyword">function</span> <span class="hljs-title function_">post</span>(<span class="hljs-params">message, data</span>) {
  <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Promise</span>(<span class="hljs-function">(<span class="hljs-params">resolve, reject</span>) =></span> {
    session.<span class="hljs-title function_">post</span>(message, data, <span class="hljs-function">(<span class="hljs-params">err, result</span>) =></span> {
      <span class="hljs-keyword">if</span> (err)
        <span class="hljs-title function_">reject</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Error</span>(<span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">stringify</span>(err)));
      <span class="hljs-keyword">else</span>
        <span class="hljs-title function_">resolve</span>(result);
    });
  });
}

<span class="hljs-keyword">async</span> <span class="hljs-keyword">function</span> <span class="hljs-title function_">collect</span>(<span class="hljs-params"></span>) {
  <span class="hljs-keyword">const</span> data = [];
  session.<span class="hljs-title function_">on</span>(<span class="hljs-string">'NodeTracing.dataCollected'</span>, <span class="hljs-function">(<span class="hljs-params">chunk</span>) =></span> data.<span class="hljs-title function_">push</span>(chunk));
  session.<span class="hljs-title function_">on</span>(<span class="hljs-string">'NodeTracing.tracingComplete'</span>, <span class="hljs-function">() =></span> {
    <span class="hljs-comment">// done</span>
  });
  <span class="hljs-keyword">const</span> traceConfig = { <span class="hljs-attr">includedCategories</span>: [<span class="hljs-string">'v8'</span>] };
  <span class="hljs-keyword">await</span> <span class="hljs-title function_">post</span>(<span class="hljs-string">'NodeTracing.start'</span>, { traceConfig });
  <span class="hljs-comment">// do something</span>
  <span class="hljs-built_in">setTimeout</span>(<span class="hljs-function">() =></span> {
    <span class="hljs-title function_">post</span>(<span class="hljs-string">'NodeTracing.stop'</span>).<span class="hljs-title function_">then</span>(<span class="hljs-function">() =></span> {
      session.<span class="hljs-title function_">disconnect</span>();
      <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(data);
    });
  }, <span class="hljs-number">1000</span>);
}

<span class="hljs-title function_">collect</span>();</code><code class="language-js cjs"><span class="hljs-meta">'use strict'</span>;

<span class="hljs-keyword">const</span> { <span class="hljs-title class_">Session</span> } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:inspector'</span>);
<span class="hljs-keyword">const</span> session = <span class="hljs-keyword">new</span> <span class="hljs-title class_">Session</span>();
session.<span class="hljs-title function_">connect</span>();

<span class="hljs-keyword">function</span> <span class="hljs-title function_">post</span>(<span class="hljs-params">message, data</span>) {
  <span class="hljs-keyword">return</span> <span class="hljs-keyword">new</span> <span class="hljs-title class_">Promise</span>(<span class="hljs-function">(<span class="hljs-params">resolve, reject</span>) =></span> {
    session.<span class="hljs-title function_">post</span>(message, data, <span class="hljs-function">(<span class="hljs-params">err, result</span>) =></span> {
      <span class="hljs-keyword">if</span> (err)
        <span class="hljs-title function_">reject</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Error</span>(<span class="hljs-title class_">JSON</span>.<span class="hljs-title function_">stringify</span>(err)));
      <span class="hljs-keyword">else</span>
        <span class="hljs-title function_">resolve</span>(result);
    });
  });
}

<span class="hljs-keyword">async</span> <span class="hljs-keyword">function</span> <span class="hljs-title function_">collect</span>(<span class="hljs-params"></span>) {
  <span class="hljs-keyword">const</span> data = [];
  session.<span class="hljs-title function_">on</span>(<span class="hljs-string">'NodeTracing.dataCollected'</span>, <span class="hljs-function">(<span class="hljs-params">chunk</span>) =></span> data.<span class="hljs-title function_">push</span>(chunk));
  session.<span class="hljs-title function_">on</span>(<span class="hljs-string">'NodeTracing.tracingComplete'</span>, <span class="hljs-function">() =></span> {
    <span class="hljs-comment">// done</span>
  });
  <span class="hljs-keyword">const</span> traceConfig = { <span class="hljs-attr">includedCategories</span>: [<span class="hljs-string">'v8'</span>] };
  <span class="hljs-keyword">await</span> <span class="hljs-title function_">post</span>(<span class="hljs-string">'NodeTracing.start'</span>, { traceConfig });
  <span class="hljs-comment">// do something</span>
  <span class="hljs-built_in">setTimeout</span>(<span class="hljs-function">() =></span> {
    <span class="hljs-title function_">post</span>(<span class="hljs-string">'NodeTracing.stop'</span>).<span class="hljs-title function_">then</span>(<span class="hljs-function">() =></span> {
      session.<span class="hljs-title function_">disconnect</span>();
      <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(data);
    });
  }, <span class="hljs-number">1000</span>);
}

<span class="hljs-title function_">collect</span>();</code><button class="copy-button">copy</button></pre></div></section>
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