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‎lib/assert.js‎
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‎lib/assert.js‎
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@@ -221,11 +221,18 @@ try {
 added:
   - v14.2.0
   - v12.19.0
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/47740
+    description: the `assert.CallTracker` class has been deprecated and will be
+                  removed in a future version.
 -->
 
-> Stability: 1 - Experimental
+> Stability: 0 - Deprecated
 
-This feature is currently experimental and behavior might still change.
+This feature is deprecated and will be removed in a future version.
+Please consider using alternatives such as the
+[`mock`][] helper function.
 
 ### `new assert.CallTracker()`
 
@@ -2559,6 +2566,7 @@ argument.
 [`assert.strictEqual()`]: #assertstrictequalactual-expected-message
 [`assert.throws()`]: #assertthrowsfn-error-message
 [`getColorDepth()`]: tty.md#writestreamgetcolordepthenv
+[`mock`]: test.md#mocking
 [`process.on('exit')`]: process.md#event-exit
 [`tracker.calls()`]: #trackercallsfn-exact
 [`tracker.verify()`]: #trackerverify
 
@@ -3360,6 +3360,21 @@ Type: Runtime
 In a future version of Node.js, the `asyncResource` property will no longer
 be added when a function is bound to an `AsyncResource`.
 
+### DEP0173: the `assert.CallTracker` class
+
+<!-- YAML
+changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/47740
+    description: Documentation-only deprecation.
+-->
+
+Type: Documentation-only
+
+In a future version of Node.js, [`assert.CallTracker`][],
+will be removed.
+Consider using alternatives such as the [`mock`][] helper function.
+
 [NIST SP 800-38D]: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38d.pdf
 [RFC 6066]: https://tools.ietf.org/html/rfc6066#section-3
 [RFC 8247 Section 2.4]: https://www.rfc-editor.org/rfc/rfc8247#section-2.4
@@ -3383,6 +3398,7 @@ be added when a function is bound to an `AsyncResource`.
 [`Server.listen({fd: <number>})`]: net.md#serverlistenhandle-backlog-callback
 [`SlowBuffer`]: buffer.md#class-slowbuffer
 [`WriteStream.open()`]: fs.md#class-fswritestream
+[`assert.CallTracker`]: assert.md#class-assertcalltracker
 [`assert`]: assert.md
 [`asyncResource.runInAsyncScope()`]: async_context.md#asyncresourceruninasyncscopefn-thisarg-args
 [`buffer.subarray`]: buffer.md#bufsubarraystart-end
@@ -3440,6 +3456,7 @@ be added when a function is bound to an `AsyncResource`.
 [`message.socket`]: http.md#messagesocket
 [`message.trailersDistinct`]: http.md#messagetrailersdistinct
 [`message.trailers`]: http.md#messagetrailers
+[`mock`]: test.md#mocking
 [`module.createRequire()`]: module.md#modulecreaterequirefilename
 [`os.networkInterfaces()`]: os.md#osnetworkinterfaces
 [`os.tmpdir()`]: os.md#ostmpdir
 
@@ -66,7 +66,7 @@ const { inspect } = require('internal/util/inspect');
 const { isPromise, isRegExp } = require('internal/util/types');
 const { EOL } = require('internal/constants');
 const { BuiltinModule } = require('internal/bootstrap/realm');
-const { isError } = require('internal/util');
+const { isError, deprecate } = require('internal/util');
 
 const errorCache = new SafeMap();
 const CallTracker = require('internal/assert/calltracker');
@@ -1049,7 +1049,7 @@ assert.doesNotMatch = function doesNotMatch(string, regexp, message) {
   internalMatch(string, regexp, message, doesNotMatch);
 };
 
-assert.CallTracker = CallTracker;
+assert.CallTracker = deprecate(CallTracker, 'assert.CallTracker is deprecated.', 'DEP0173');
 
 /**
  * Expose a strict only variant of assert.