From 51474716e986601b354cb0be638f68d6100de275 Mon Sep 17 00:00:00 2001
From: =?utf8?q?J=C3=A9r=C3=B4me=20Benoit?= <jerome.benoit@sap.com>
Date: Sat, 1 Jul 2023 12:09:39 +0200
Subject: [PATCH] feat: add safe helper around os.availableParallelism
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Signed-off-by: Jérôme Benoit <jerome.benoit@sap.com>
---
 src/index.ts |  1 +
 src/utils.ts | 17 +++++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/src/index.ts b/src/index.ts
index 367c205c..9bd8bbf9 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -65,3 +65,4 @@ export type {
 } from './utility-types'
 export type { CircularArray } from './circular-array'
 export type { Queue } from './queue'
+export { availableParallelism } from './utils'
diff --git a/src/utils.ts b/src/utils.ts
index c7efbc22..a6f5fbcc 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,3 +1,4 @@
+import os from 'node:os'
 import type {
   MeasurementStatisticsRequirements,
   WorkerChoiceStrategyOptions
@@ -30,6 +31,22 @@ export const DEFAULT_MEASUREMENT_STATISTICS_REQUIREMENTS: MeasurementStatisticsR
     median: false
   }
 
+/**
+ * Safe helper to get the host OS optimized maximum pool size.
+ */
+export const availableParallelism = (): number => {
+  let availableParallelism = 1
+  try {
+    availableParallelism = os.availableParallelism()
+  } catch {
+    const cpus = os.cpus()
+    if (Array.isArray(cpus) && cpus.length > 0) {
+      availableParallelism = cpus.length
+    }
+  }
+  return availableParallelism
+}
+
 /**
  * Compute the median of the given data set.
  *
-- 
2.34.1