From 1e03855b8b4123ce25bd1c46b0ccbf4207acd1fd Mon Sep 17 00:00:00 2001
From: Mike Marcacci <mike.marcacci@gmail.com>
Date: Sat, 24 Jul 2021 22:59:42 -0700
Subject: [PATCH] test and support older versions of node

---
 .github/workflows/ci.yml | 2 +-
 package.json             | 4 +++-
 src/index.ts             | 9 ++++++++-
 3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 543e9ed..c704778 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -13,7 +13,7 @@ jobs:
     container: "node:${{matrix.node}}"
     strategy:
       matrix:
-        node: ["16"]
+        node: ["12", "14", "16"]
     services:
       redis-single-instance:
         image: redis
diff --git a/package.json b/package.json
index 23f28f6..7f34dc0 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,9 @@
     "prepare": "yarn build",
     "prepublishOnly": "yarn install && yarn lint && yarn build && yarn test"
   },
-  "dependencies": {},
+  "dependencies": {
+    "node-abort-controller": "^2.0.0"
+  },
   "type": "module",
   "exports": "./dist/index.js"
 }
diff --git a/src/index.ts b/src/index.ts
index d77a99c..a038fc9 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,6 +1,10 @@
 import { randomBytes, createHash } from "crypto";
 import { EventEmitter } from "events";
 
+// AbortController became available as a global in node version 16. Once version
+// 14 reaches its end-of-life, this can be removed.
+import PolyfillAbortController from "node-abort-controller";
+
 import { Redis as IORedisClient } from "ioredis";
 type Client = IORedisClient;
 
@@ -679,7 +683,10 @@ export default class Redlock extends EventEmitter {
     // The AbortController/AbortSignal pattern allows the routine to be notified
     // of a failure to extend the lock, and subsequent expiration. In the event
     // of an abort, the error object will be made available at `signal.error`.
-    const controller = new AbortController();
+    const controller = AbortController
+      ? new AbortController()
+      : new PolyfillAbortController();
+
     const signal = controller.signal as RedlockAbortSignal;
 
     function queue(): void {