Improve benchmark test reliability

Since older node versions are not as fast as the latest node version we
should take that into account and increase the performance budget for
older node versions.

benchmarks/measure.js

@@ -6,9 +6,24 @@ const times = require('ramda/src/times');
 const median = require('ramda/src/median');
 const map = require('ramda/src/map');
 const prop = require('ramda/src/prop');
+const semver = require('semver');
 
 const [ { speed: cpuSpeed } ] = os.cpus();
 
+function getNodeVersionMultiplier() {
+    const currentNodeVersion = process.version;
+
+    if (semver.lt(currentNodeVersion, '14.0.0') && semver.gte(currentNodeVersion, '12.0.0')) {
+        return 1.5;
+    }
+
+    if (semver.lt(currentNodeVersion, '12.0.0')) {
+        return 2;
+    }
+
+    return 1;
+}
+
 function clearRequireCache() {
     Object.keys(require.cache).forEach(function (key) {
         delete require.cache[key];
@@ -36,4 +51,4 @@ function runBenchmark(fn, count) {
     return { medianDuration, medianMemory };
 }
 
-module.exports = { runBenchmark, clearRequireCache, cpuSpeed };
+module.exports = { runBenchmark, clearRequireCache, cpuSpeed, getNodeVersionMultiplier };

benchmarks/runtime.bench.js

@@ -5,7 +5,7 @@ const { Linter } = require('eslint');
 const times = require('ramda/src/times');
 const toPairs = require('ramda/src/toPairs');
 const fromPairs = require('ramda/src/fromPairs');
-const { runBenchmark, cpuSpeed } = require('./measure');
+const { runBenchmark, cpuSpeed, getNodeVersionMultiplier } = require('./measure');
 const mochaPlugin = require('../');
 
 const recommendedRules = mochaPlugin.configs.recommended.rules;
@@ -85,7 +85,8 @@ function lintManyFilesWithAllRecommendedRules({ numberOfFiles }) {
 
 describe('runtime', () => {
     it('should not take longer as the defined budget to lint many files with the recommended config', () => {
-        const budget = 80000000 / cpuSpeed;
+        const nodeVersionMultiplier = getNodeVersionMultiplier();
+        const budget = 80000000 / cpuSpeed * nodeVersionMultiplier;
 
         const { medianDuration } = runBenchmark(() => {
             lintManyFilesWithAllRecommendedRules({ numberOfFiles: 350 });

package.json

@@ -34,7 +34,8 @@
         "eslint-plugin-unicorn": "^21.0.0",
         "mocha": "^8.1.0",
         "nyc": "^15.1.0",
-        "pr-log": "^4.0.0"
+        "pr-log": "^4.0.0",
+        "semver": "^7.3.4"
     },
     "peerDependencies": {
         "eslint": ">=7.0.0"