diff --git a/.nycrc b/.nycrc
index 23a3fdfe39..d79a0ddd65 100644
--- a/.nycrc
+++ b/.nycrc
@@ -1,9 +1,9 @@
 {
   "check-coverage": true,
-  "lines": 98.47,
-  "functions": 96.44,
-  "branches": 95.39,
-  "statements": 98.45,
+  "lines": 98.53,
+  "functions": 96.59,
+  "branches": 95.51,
+  "statements": 98.51,
   "include": [
     "src/**/*.ts"
   ],
diff --git a/src/file/custom-properties/custom-properties-attributes.ts b/src/file/custom-properties/custom-properties-attributes.ts
index 087c9e98a1..2b91ce0ac0 100644
--- a/src/file/custom-properties/custom-properties-attributes.ts
+++ b/src/file/custom-properties/custom-properties-attributes.ts
@@ -1,11 +1,9 @@
 import { XmlAttributeComponent } from "file/xml-components";
 
-export interface ICustomPropertiesAttributes {
+export class CustomPropertiesAttributes extends XmlAttributeComponent<{
     readonly xmlns: string;
     readonly vt: string;
-}
-
-export class CustomPropertiesAttributes extends XmlAttributeComponent<ICustomPropertiesAttributes> {
+}> {
     protected readonly xmlKeys = {
         xmlns: "xmlns",
         vt: "xmlns:vt",
diff --git a/src/file/custom-properties/custom-property-attributes.ts b/src/file/custom-properties/custom-property-attributes.ts
index 9b2697fe94..e681eee135 100644
--- a/src/file/custom-properties/custom-property-attributes.ts
+++ b/src/file/custom-properties/custom-property-attributes.ts
@@ -1,12 +1,10 @@
 import { XmlAttributeComponent } from "file/xml-components";
 
-export interface ICustomPropertyAttributes {
+export class CustomPropertyAttributes extends XmlAttributeComponent<{
     readonly fmtid: string;
     readonly pid: string;
     readonly name: string;
-}
-
-export class CustomPropertyAttributes extends XmlAttributeComponent<ICustomPropertyAttributes> {
+}> {
     protected readonly xmlKeys = {
         fmtid: "fmtid",
         pid: "pid",
diff --git a/src/file/media/media.spec.ts b/src/file/media/media.spec.ts
index d623e0e929..d3446ea0c1 100644
--- a/src/file/media/media.spec.ts
+++ b/src/file/media/media.spec.ts
@@ -77,19 +77,23 @@ describe("Media", () => {
         });
 
         it("should return UInt8Array if atob is present", () => {
-            // tslint:disable-next-line
-            ((process as any).atob as any) = () => "atob result";
+            global.atob = () => "atob result";
 
             const image = new Media().addMedia("");
             expect(image.stream).to.be.an.instanceof(Uint8Array);
+
+            // tslint:disable-next-line: no-any
+            (global as any).atob = undefined;
         });
 
         it("should use data as is if its not a string", () => {
-            // tslint:disable-next-line
-            ((process as any).atob as any) = () => "atob result";
+            global.atob = () => "atob result";
 
-            const image = new Media().addMedia(new Buffer(""));
+            const image = new Media().addMedia(Buffer.from(""));
             expect(image.stream).to.be.an.instanceof(Uint8Array);
+
+            // tslint:disable-next-line: no-any
+            (global as any).atob = undefined;
         });
     });