Add TestContext.workerId to node:test type definitions

Refs: nodejs/node#61394

Signed-off-by: Ali Hassan <[email protected]>

Author: thisalihassan

types/node/node-tests/test.ts

@@ -175,6 +175,8 @@ test(undefined, undefined, t => {
     t.error;
     // $ExpectType number
     t.attempt;
+    // $ExpectType number | undefined
+    t.workerId;
 });
 
 // Test the subtest approach.

types/node/test.d.ts

@@ -983,6 +983,15 @@ declare module "node:test" {
              * @since v21.7.0, v20.12.0
              */
             readonly attempt: number;
+            /**
+             * The unique identifier of the worker running the current test file.
+             * When running tests with `--test-isolation=process` (the default), each test
+             * file runs in a separate child process and is assigned a worker ID from 1 to N,
+             * where N is the number of concurrent workers. When running with
+             * `--test-isolation=none`, all tests run in the same process and the worker ID
+             * is always 1. This value is `undefined` when not running in a test context.
+             */
+            readonly workerId: number | undefined;
             /**
              * This function is used to set the number of assertions and subtests that are expected to run
              * within the test. If the number of assertions and subtests that run does not match the

types/node/v24/test.d.ts

@@ -989,6 +989,15 @@ declare module "node:test" {
              */
             readonly assert: TestContextAssert;
             readonly attempt: number;
+            /**
+             * The unique identifier of the worker running the current test file.
+             * When running tests with `--test-isolation=process` (the default), each test
+             * file runs in a separate child process and is assigned a worker ID from 1 to N,
+             * where N is the number of concurrent workers. When running with
+             * `--test-isolation=none`, all tests run in the same process and the worker ID
+             * is always 1. This value is `undefined` when not running in a test context.
+             */
+            readonly workerId: number | undefined;
             /**
              * This function is used to create a hook running before subtest of the current test.
              * @param fn The hook function. The first argument to this function is a `TestContext` object.