Fix incompatibility with perf_hooks accross nodejs versions (#515)

Author: Fadoli

CHANGELOG.md

@@ -11,6 +11,8 @@ project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 
+- Increase compatibility with external build system such as `rollup` by making perf_hooks optional in gc.js
+
 ### Added
 
 ## [14.1.0] - 2022-08-23

lib/metrics/gc.js

@@ -14,10 +14,13 @@ const NODEJS_GC_DURATION_SECONDS = 'nodejs_gc_duration_seconds';
 const DEFAULT_GC_DURATION_BUCKETS = [0.001, 0.01, 0.1, 1, 2, 5];
 
 const kinds = [];
-kinds[perf_hooks.constants.NODE_PERFORMANCE_GC_MAJOR] = 'major';
-kinds[perf_hooks.constants.NODE_PERFORMANCE_GC_MINOR] = 'minor';
-kinds[perf_hooks.constants.NODE_PERFORMANCE_GC_INCREMENTAL] = 'incremental';
-kinds[perf_hooks.constants.NODE_PERFORMANCE_GC_WEAKCB] = 'weakcb';
+
+if (perf_hooks && perf_hooks.constants) {
+	kinds[perf_hooks.constants.NODE_PERFORMANCE_GC_MAJOR] = 'major';
+	kinds[perf_hooks.constants.NODE_PERFORMANCE_GC_MINOR] = 'minor';
+	kinds[perf_hooks.constants.NODE_PERFORMANCE_GC_INCREMENTAL] = 'incremental';
+	kinds[perf_hooks.constants.NODE_PERFORMANCE_GC_WEAKCB] = 'weakcb';
+}
 
 module.exports = (registry, config = {}) => {
 	if (!perf_hooks) {