Add CLI startup speed benchmark (#7617)

1 files changed, 15 insertions, 0 deletions

diff --git a/benchmark/bench/_util.js b/benchmark/bench/_util.js
index b61c79a78..c9108695c 100644
--- a/benchmark/bench/_util.js
+++ b/benchmark/bench/_util.js
@@ -1,3 +1,18 @@
 import { createRequire } from 'module';
 
 export const astroBin = createRequire(import.meta.url).resolve('astro');
+
+/** @typedef {{ avg: number, stdev: number, max: number }} Stat */
+
+/**
+ * @param {number[]} numbers
+ * @returns {Stat}
+ */
+export function calculateStat(numbers) {
+	const avg = numbers.reduce((a, b) => a + b, 0) / numbers.length;
+	const stdev = Math.sqrt(
+		numbers.map((x) => Math.pow(x - avg, 2)).reduce((a, b) => a + b, 0) / numbers.length
+	);
+	const max = Math.max(...numbers);
+	return { avg, stdev, max };
+}