diff --git a/ts/tests/docx/run/underlineTests.ts b/ts/tests/docx/run/underlineTests.ts
index 4a6e931598..fa40923306 100644
--- a/ts/tests/docx/run/underlineTests.ts
+++ b/ts/tests/docx/run/underlineTests.ts
@@ -1,9 +1,10 @@
-import * as u from "../../../docx/run/underline";
-import { TextRun } from "../../../docx/run/text-run";
 import { assert } from "chai";
 
-function jsonify(obj: Object) {
-    let stringifiedJson = JSON.stringify(obj);
+import { TextRun } from "../../../docx/run/text-run";
+import * as u from "../../../docx/run/underline";
+
+function jsonify(obj: object) {
+    const stringifiedJson = JSON.stringify(obj);
     return JSON.parse(stringifiedJson);
 }
 
@@ -12,8 +13,8 @@ describe("Underline", () => {
     describe("#constructor()", () => {
 
         it("should create a new Underline object with u:u as the rootKey", () => {
-            let underline = new u.Underline();
-            let newJson = jsonify(underline);
+            const underline = new u.Underline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.rootKey, "w:u");
         });
     });
@@ -23,14 +24,14 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should have u:u as the rootKey", () => {
-            let underline = new u.DashDotDotHeavyUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.DashDotDotHeavyUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.rootKey, "w:u");
         });
 
         it("should put value in attribute", () => {
-            let underline = new u.DashDotDotHeavyUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.DashDotDotHeavyUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "dashDotDotHeavy");
         });
     });
@@ -40,8 +41,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.DashDotHeavyUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.DashDotHeavyUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "dashDotHeavy");
         });
     });
@@ -51,8 +52,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.DashLongHeavyUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.DashLongHeavyUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "dashLongHeavy");
         });
     });
@@ -62,8 +63,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.DashLongUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.DashLongUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "dashLong");
         });
     });
@@ -73,8 +74,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.DashUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.DashUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "dash");
         });
     });
@@ -84,8 +85,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.DotDashUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.DotDashUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "dotDash");
         });
     });
@@ -95,8 +96,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.DotDotDashUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.DotDotDashUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "dotDotDash");
         });
     });
@@ -106,8 +107,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.DottedHeavyUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.DottedHeavyUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "dottedHeavy");
         });
     });
@@ -117,8 +118,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.DottedUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.DottedUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "dotted");
         });
     });
@@ -128,8 +129,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.DoubleUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.DoubleUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "double");
         });
     });
@@ -139,8 +140,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.SingleUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.SingleUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "single");
         });
     });
@@ -150,8 +151,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.ThickUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.ThickUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "thick");
         });
     });
@@ -161,8 +162,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.WaveUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.WaveUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "wave");
         });
     });
@@ -172,8 +173,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.WavyDoubleUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.WavyDoubleUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "wavyDouble");
         });
     });
@@ -183,8 +184,8 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.WavyHeavyUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.WavyHeavyUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "wavyHeavy");
         });
     });
@@ -194,9 +195,9 @@ describe("DashDotDotHeavyUnderline", () => {
 
     describe("#constructor()", () => {
         it("should put value in attribute", () => {
-            let underline = new u.WordsUnderline();
-            let newJson = jsonify(underline);
+            const underline = new u.WordsUnderline();
+            const newJson = jsonify(underline);
             assert.equal(newJson.root[0].root.val, "words");
         });
     });
-});
\ No newline at end of file
+});