nodejs
diff --git a/‎doc/api/process.md‎
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diff --git a/‎lib/internal/worker.js‎
Lines changed: 2 additions & 0 deletions b/‎lib/internal/worker.js‎
Lines changed: 2 additions & 0 deletions
diff --git a/‎test/parallel/test-worker-event.js‎
Lines changed: 13 additions & 0 deletions b/‎test/parallel/test-worker-event.js‎
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@@ -457,6 +457,15 @@ of the custom deprecation.
 The `*-deprecation` command-line flags only affect warnings that use the name
 `'DeprecationWarning'`.
 
+### Event: `'worker'`
+<!-- YAML
+added: REPLACEME
+-->
+
+* `worker` {Worker} The {Worker} that was created.
+
+The `'worker'` event is emitted after a new {Worker} thread has been created.
+
 #### Emitting custom warnings
 
 See the [`process.emitWarning()`][process_emit_warning] method for issuing
 
@@ -266,6 +266,8 @@ class Worker extends EventEmitter {
     };
     // Actually start the new thread now that everything is in place.
     this[kHandle].startThread();
+
+    process.nextTick(() => process.emit('worker', this));
   }
 
   [kOnExit](code, customErr, customErrReason) {
 
@@ -0,0 +1,13 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const {
+  Worker,
+} = require('worker_threads');
+
+process.on('worker', common.mustCall(({ threadId }) => {
+  assert.strictEqual(threadId, 1);
+}));
+
+new Worker('', { eval: true });
Original file line number	Diff line number	Diff line change
@@ -266,6 +266,8 @@ class Worker extends EventEmitter {
266	266	};
267	267	// Actually start the new thread now that everything is in place.
268	268	this[kHandle].startThread();
	269	+
	270	+ process.nextTick(() => process.emit('worker', this));
269	271	}
270	272
271	273	[kOnExit](code, customErr, customErrReason) {