fix: enable bun.js by catching NotImplemented error

.editorconfig

@@ -8,3 +8,7 @@ end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
+
+[*.yml]
+indent_style = space
+indent_size = 2

.github/workflows/nodejs.yml → .github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: Node.js CI
+name: CI
 
 on:
   push:
@@ -11,7 +11,7 @@ on:
       - '**'
 
 jobs:
-  build:
+  nodejs:
     name: Test on Node.js v${{ matrix.node-version }} and OS ${{ matrix.os }}
     strategy:
       fail-fast: false
@@ -40,3 +40,15 @@ jobs:
         run: npm i
       - name: Test
         run: npm run test
+  bun:
+    name: Test on Bun
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: latest
+      - name: Install Dependencies
+        run: bun install
+      - name: Test
+        run: bun test-unit

CHANGELOG.md

@@ -11,6 +11,8 @@ project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Changed
 
+- Enable `bun.js` by catching `NotImplemented` error (Fixes [#570](https://github.com/siimon/prom-client/issues/570))
+
 ### Added
 
 [unreleased]: https://github.com/siimon/prom-client/compare/v15.1.0...HEAD

lib/metrics/eventLoopLag.js

@@ -37,32 +37,39 @@ module.exports = (registry, config = {}) => {
 	const labelNames = Object.keys(labels);
 	const registers = registry ? [registry] : undefined;
 
-	let collect;
-	if (!perf_hooks || !perf_hooks.monitorEventLoopDelay) {
-		collect = () => {
-			const start = process.hrtime();
-			setImmediate(reportEventloopLag, start, lag, labels);
-		};
-	} else {
-		const histogram = perf_hooks.monitorEventLoopDelay({
-			resolution: config.eventLoopMonitoringPrecision,
-		});
-		histogram.enable();
+	let collect = () => {
+		const start = process.hrtime();
+		setImmediate(reportEventloopLag, start, lag, labels);
+	};
 
-		collect = () => {
-			const start = process.hrtime();
-			setImmediate(reportEventloopLag, start, lag, labels);
+	if (perf_hooks && perf_hooks.monitorEventLoopDelay) {
+		try {
+			const histogram = perf_hooks.monitorEventLoopDelay({
+				resolution: config.eventLoopMonitoringPrecision,
+			});
+			histogram.enable();
 
-			lagMin.set(labels, histogram.min / 1e9);
-			lagMax.set(labels, histogram.max / 1e9);
-			lagMean.set(labels, histogram.mean / 1e9);
-			lagStddev.set(labels, histogram.stddev / 1e9);
-			lagP50.set(labels, histogram.percentile(50) / 1e9);
-			lagP90.set(labels, histogram.percentile(90) / 1e9);
-			lagP99.set(labels, histogram.percentile(99) / 1e9);
+			collect = () => {
+				const start = process.hrtime();
+				setImmediate(reportEventloopLag, start, lag, labels);
 
-			histogram.reset();
-		};
+				lagMin.set(labels, histogram.min / 1e9);
+				lagMax.set(labels, histogram.max / 1e9);
+				lagMean.set(labels, histogram.mean / 1e9);
+				lagStddev.set(labels, histogram.stddev / 1e9);
+				lagP50.set(labels, histogram.percentile(50) / 1e9);
+				lagP90.set(labels, histogram.percentile(90) / 1e9);
+				lagP99.set(labels, histogram.percentile(99) / 1e9);
+
+				histogram.reset();
+			};
+		} catch (e) {
+			if (e.code === 'ERR_NOT_IMPLEMENTED') {
+				return; // Bun
+			}
+
+			throw e;
+		}
 	}
 
 	const lag = new Gauge({

lib/metrics/heapSpacesSizeAndUsed.js

@@ -11,6 +11,14 @@ METRICS.forEach(metricType => {
 });
 
 module.exports = (registry, config = {}) => {
+	try {
+		v8.getHeapSpaceStatistics();
+	} catch (e) {
+		if (e.code === 'ERR_NOT_IMPLEMENTED') {
+			return; // Bun
+		}
+		throw e;
+	}
 	const registers = registry ? [registry] : undefined;
 	const namePrefix = config.prefix ? config.prefix : '';