diff --git a/build/webpack.config.js b/build/webpack.config.js
index 16efdba809..8aefb1a65c 100644
--- a/build/webpack.config.js
+++ b/build/webpack.config.js
@@ -27,7 +27,8 @@ const languages = isProd ? locales : ['en-US']; // Only 1 language needed for de
 
 /* eslint-disable key-spacing, require-jsdoc */
 function updateConfig(conf, language, index) {
-    const config = Object.assign(conf, {
+    const config = {
+        ...conf,
         entry: {
             annotations: ['box-annotations'],
             preview: [`${lib}/Preview.js`],
@@ -64,7 +65,7 @@ function updateConfig(conf, language, index) {
             inline: true,
             port: 8000,
         },
-    });
+    };
 
     if (index === 0) {
         config.plugins.push(new RsyncPlugin(thirdParty, staticFolder));
diff --git a/build/webpack.karma.config.js b/build/webpack.karma.config.js
index 67d3d76591..c5a061c6ea 100644
--- a/build/webpack.karma.config.js
+++ b/build/webpack.karma.config.js
@@ -10,14 +10,15 @@ const commonConfig = require('./webpack.common.config');
 
 const baseConfig = commonConfig('en-US');
 
-const config = Object.assign(baseConfig, {
+const config = {
+    ...baseConfig,
     mode: 'development',
     resolve: {
         alias: {
             sinon: 'sinon/pkg/sinon',
         },
     },
-});
+};
 
 if (isDebug) {
     config.devtool = 'inline-source-map';
diff --git a/src/lib/Preview.js b/src/lib/Preview.js
index 5067318b21..7ea6ec2182 100644
--- a/src/lib/Preview.js
+++ b/src/lib/Preview.js
@@ -238,7 +238,7 @@ class Preview extends EventEmitter {
         // Token can also be null or undefined for offline use case.
         // But it cannot be a random object.
         if (token === null || typeof token !== 'object') {
-            this.previewOptions = Object.assign({}, options, { token });
+            this.previewOptions = { ...options, token };
         } else {
             throw new Error('Bad access token!');
         }
@@ -331,9 +331,7 @@ class Preview extends EventEmitter {
                 fileIds.push(fileOrId.toString());
             } else if (fileOrId && typeof fileOrId === 'object' && isValidFileId(fileOrId.id)) {
                 // Possible well-formed file object found in the collection
-                const wellFormedFileObj = Object.assign({}, fileOrId, {
-                    id: fileOrId.id.toString(),
-                });
+                const wellFormedFileObj = { ...fileOrId, id: fileOrId.id.toString() };
                 fileIds.push(wellFormedFileObj.id);
                 files.push(wellFormedFileObj);
             } else {
@@ -537,7 +535,7 @@ class Preview extends EventEmitter {
             }
 
             // This allows the browser to download representation content
-            const params = Object.assign({ response_content_disposition_type: 'attachment' }, queryParams);
+            const params = { response_content_disposition_type: 'attachment', ...queryParams };
             const downloadUrl = appendQueryParams(
                 this.viewer.createContentUrlWithAuthParams(contentUrlTemplate, this.viewer.getAssetPath()),
                 params,
@@ -869,7 +867,7 @@ class Preview extends EventEmitter {
      * @return {void}
      */
     parseOptions(previewOptions) {
-        const options = Object.assign({}, previewOptions);
+        const options = { ...previewOptions };
 
         // Reset all options
         this.options = {};
@@ -986,14 +984,14 @@ class Preview extends EventEmitter {
      * @return {Object} combined options
      */
     createViewerOptions(moreOptions) {
-        return cloneDeep(
-            Object.assign({}, this.options, moreOptions, {
-                api: this.api,
-                location: this.location,
-                cache: this.cache,
-                ui: this.ui,
-            }),
-        );
+        return cloneDeep({
+            ...this.options,
+            ...moreOptions,
+            api: this.api,
+            location: this.location,
+            cache: this.cache,
+            ui: this.ui,
+        });
     }
 
     /**
@@ -1023,12 +1021,10 @@ class Preview extends EventEmitter {
      */
     loadFromServer() {
         const { apiHost, previewWMPref, queryParams } = this.options;
-        const params = Object.assign(
-            {
-                watermark_preference: convertWatermarkPref(previewWMPref),
-            },
-            queryParams,
-        );
+        const params = {
+            watermark_preference: convertWatermarkPref(previewWMPref),
+            ...queryParams,
+        };
 
         const fileVersionId = this.getFileOption(this.file.id, FILE_OPTION_FILE_VERSION_ID) || '';
 
@@ -1639,12 +1635,10 @@ class Preview extends EventEmitter {
      */
     prefetchNextFiles() {
         const { apiHost, previewWMPref, queryParams, skipServerUpdate } = this.options;
-        const params = Object.assign(
-            {
-                watermark_preference: convertWatermarkPref(previewWMPref),
-            },
-            queryParams,
-        );
+        const params = {
+            watermark_preference: convertWatermarkPref(previewWMPref),
+            ...queryParams,
+        };
 
         // Don't bother prefetching when there aren't more files or we need to skip server update
         if (this.collection.length < 2 || skipServerUpdate) {
diff --git a/src/lib/__tests__/Preview-test.js b/src/lib/__tests__/Preview-test.js
index 8b20c11d1a..3a3f29be3e 100644
--- a/src/lib/__tests__/Preview-test.js
+++ b/src/lib/__tests__/Preview-test.js
@@ -235,7 +235,7 @@ describe('lib/Preview', () => {
 
             preview.show(file, token, options);
 
-            expect(stubs.parseOptions).to.be.calledWith(Object.assign({}, options, { token }));
+            expect(stubs.parseOptions).to.be.calledWith({ ...options, token });
         });
     });
 
diff --git a/src/lib/file.js b/src/lib/file.js
index ec423b51c6..b3a39ca133 100644
--- a/src/lib/file.js
+++ b/src/lib/file.js
@@ -120,7 +120,7 @@ export function checkFileValid(file) {
  * @return {Object} File version object normalized to a file object from the API
  */
 export function normalizeFileVersion(fileVersion, fileId) {
-    const file = Object.assign({}, fileVersion);
+    const file = { ...fileVersion };
     file.id = fileId; // ID returned by file versions API is file version ID, so we need to set to file ID
     file.shared_link = {}; // File versions API does not return shared link object
     file.file_version = {
diff --git a/src/lib/viewers/BaseViewer.js b/src/lib/viewers/BaseViewer.js
index dab7dd6df5..30fc39181c 100644
--- a/src/lib/viewers/BaseViewer.js
+++ b/src/lib/viewers/BaseViewer.js
@@ -1121,14 +1121,14 @@ class BaseViewer extends EventEmitter {
             whoDrew: __('annotation_who_drew'),
         };
 
-        return cloneDeep(
-            Object.assign({}, this.options, moreOptions, {
-                isMobile: this.isMobile,
-                hasTouch: this.hasTouch,
-                locale: this.options.location.locale,
-                localizedStrings,
-            }),
-        );
+        return cloneDeep({
+            ...this.options,
+            ...moreOptions,
+            isMobile: this.isMobile,
+            hasTouch: this.hasTouch,
+            locale: this.options.location.locale,
+            localizedStrings,
+        });
     }
 
     /**
diff --git a/src/lib/viewers/box3d/model3d/Model3DSettingsPullup.js b/src/lib/viewers/box3d/model3d/Model3DSettingsPullup.js
index bbd355e274..74b4c0bbad 100644
--- a/src/lib/viewers/box3d/model3d/Model3DSettingsPullup.js
+++ b/src/lib/viewers/box3d/model3d/Model3DSettingsPullup.js
@@ -134,7 +134,7 @@ class Model3DSettingsPullup extends EventEmitter {
 
         // Render Mode dropdown
         const renderPanelData = RENDER_MODES.map(entry => {
-            const entryCopy = Object.assign({}, entry);
+            const entryCopy = { ...entry };
             this.convertToValidCallback(entryCopy);
             return entryCopy;
         });
@@ -181,7 +181,7 @@ class Model3DSettingsPullup extends EventEmitter {
 
         // Camera Projection dropdown
         const projectionPanelData = PROJECTION_MODES.map(entry => {
-            const entryCopy = Object.assign({}, entry);
+            const entryCopy = { ...entry };
             this.convertToValidCallback(entryCopy);
             return entryCopy;
         });
diff --git a/src/lib/viewers/office/__tests__/OfficeLoader-test.js b/src/lib/viewers/office/__tests__/OfficeLoader-test.js
index 7e13cab07e..6f92fcbd33 100644
--- a/src/lib/viewers/office/__tests__/OfficeLoader-test.js
+++ b/src/lib/viewers/office/__tests__/OfficeLoader-test.js
@@ -26,9 +26,9 @@ describe('lib/viewers/office/OfficeLoader', () => {
 
     describe('determineViewer()', () => {
         const fakeFiles = [
-            Object.assign({}, fakeFileTemplate, { extension: 'xlsx' }),
-            Object.assign({}, fakeFileTemplate, { extension: 'xlsm' }),
-            Object.assign({}, fakeFileTemplate, { extension: 'xlsb' }),
+            { ...fakeFileTemplate, extension: 'xlsx' },
+            { ...fakeFileTemplate, extension: 'xlsm' },
+            { ...fakeFileTemplate, extension: 'xlsb' },
         ];
 
         fakeFiles.forEach(fakeFile => {