lib: initial experimental AbortController implementation

AbortController impl based very closely on:
 https://github.com/mysticatea/abort-controller

Marked experimental.
Not currently used by any of the existing promise apis.

Signed-off-by: James M Snell <jasnell@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/33527
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

1 files changed, 27 insertions, 0 deletions

diff --git a/lib/internal/bootstrap/pre_execution.js b/lib/internal/bootstrap/pre_execution.js
index f60814d2dc9..9a0b2c361d3 100644
--- a/lib/internal/bootstrap/pre_execution.js
+++ b/lib/internal/bootstrap/pre_execution.js
@@ -3,6 +3,7 @@
 const {
   Map,
   ObjectDefineProperty,
+  ObjectDefineProperties,
   SafeWeakMap,
 } = primordials;
 
@@ -53,6 +54,7 @@ function prepareMainThreadExecution(expandArgv1 = false) {
   // (including preload modules).
   initializeClusterIPC();
 
+  initializeAbortController();
   initializeDeprecations();
   initializeWASI();
   initializeCJSLoader();
@@ -304,6 +306,30 @@ function initializeDeprecations() {
   });
 }
 
+function initializeAbortController() {
+  const abortController = getOptionValue('--experimental-abortcontroller');
+  if (abortController) {
+    const {
+      AbortController,
+      AbortSignal
+    } = require('internal/abort_controller');
+    ObjectDefineProperties(global, {
+      AbortController: {
+        writable: true,
+        enumerable: false,
+        configurable: true,
+        value: AbortController
+      },
+      AbortSignal: {
+        writable: true,
+        enumerable: false,
+        configurable: true,
+        value: AbortSignal
+      }
+    });
+  }
+}
+
 function setupChildProcessIpcChannel() {
   if (process.env.NODE_CHANNEL_FD) {
     const assert = require('internal/assert');
@@ -438,6 +464,7 @@ module.exports = {
   setupWarningHandler,
   setupDebugEnv,
   prepareMainThreadExecution,
+  initializeAbortController,
   initializeDeprecations,
   initializeESMLoader,
   initializeFrozenIntrinsics,