diff --git a/tests/e2e/compare/math.js b/tests/e2e/compare/math.ts
similarity index 83%
rename from tests/e2e/compare/math.js
rename to tests/e2e/compare/math.ts
index a87c58c4dff3..59a56dd3c842 100644
--- a/tests/e2e/compare/math.js
+++ b/tests/e2e/compare/math.ts
@@ -7,13 +7,8 @@
  *
  * Based on :: https://github.com/v8/v8/blob/master/test/benchmarks/csuite/compare-baseline.py
  *
- * @param {Number} baselineMean
- * @param {Number} baselineStdev
- * @param {Number} currentMean
- * @param {Number} runs
- * @returns {Number}
  */
-const computeZ = (baselineMean, baselineStdev, currentMean, runs) => {
+const computeZ = (baselineMean: number, baselineStdev: number, currentMean: number, runs: number): number => {
     if (baselineStdev === 0) {
         return 1000;
     }
@@ -26,10 +21,8 @@ const computeZ = (baselineMean, baselineStdev, currentMean, runs) => {
  *
  * Based on :: https://github.com/v8/v8/blob/master/test/benchmarks/csuite/compare-baseline.py
  *
- * @param {Number} z
- * @returns {Number}
  */
-const computeProbability = (z) => {
+const computeProbability = (z: number): number => {
     // p 0.005: two sided < 0.01
     if (z > 2.575829) {
         return 0;
diff --git a/tests/e2e/measure/math.js b/tests/e2e/measure/math.ts
similarity index 64%
rename from tests/e2e/measure/math.js
rename to tests/e2e/measure/math.ts
index 14f75a7f980e..e1c0cb981a0c 100644
--- a/tests/e2e/measure/math.js
+++ b/tests/e2e/measure/math.ts
@@ -1,6 +1,13 @@
-import _ from 'underscore';
+type Entries = number[];
 
-const filterOutliersViaIQR = (data) => {
+type Stats = {
+    mean: number;
+    stdev: number;
+    runs: number;
+    entries: Entries;
+};
+
+const filterOutliersViaIQR = (data: Entries): Entries => {
     let q1;
     let q3;
 
@@ -18,22 +25,17 @@ const filterOutliersViaIQR = (data) => {
     const maxValue = q3 + iqr * 1.5;
     const minValue = q1 - iqr * 1.5;
 
-    return _.filter(values, (x) => x >= minValue && x <= maxValue);
+    return values.filter((x) => x >= minValue && x <= maxValue);
 };
 
-const mean = (arr) => _.reduce(arr, (a, b) => a + b, 0) / arr.length;
+const mean = (arr: Entries): number => arr.reduce((a, b) => a + b, 0) / arr.length;
 
-const std = (arr) => {
+const std = (arr: Entries): number => {
     const avg = mean(arr);
-    return Math.sqrt(
-        _.reduce(
-            _.map(arr, (i) => (i - avg) ** 2),
-            (a, b) => a + b,
-        ) / arr.length,
-    );
+    return Math.sqrt(arr.map((i) => (i - avg) ** 2).reduce((a, b) => a + b) / arr.length);
 };
 
-const getStats = (entries) => {
+const getStats = (entries: Entries): Stats => {
     const cleanedEntries = filterOutliersViaIQR(entries);
     const meanDuration = mean(cleanedEntries);
     const stdevDuration = std(cleanedEntries);
@@ -46,5 +48,4 @@ const getStats = (entries) => {
     };
 };
 
-// eslint-disable-next-line import/prefer-default-export
 export default getStats;