diff --git a/app/attachments.js b/app/attachments.js
index 4382ca6fd..cdbf724e4 100644
--- a/app/attachments.js
+++ b/app/attachments.js
@@ -11,7 +11,7 @@ const PATH = 'attachments.noindex';
 //      getPath :: AbsolutePath -> AbsolutePath
 exports.getPath = (userDataPath) => {
   if (!isString(userDataPath)) {
-    throw new TypeError('"userDataPath" must be a string');
+    throw new TypeError("'userDataPath' must be a string");
   }
   return path.join(userDataPath, PATH);
 };
@@ -19,7 +19,7 @@ exports.getPath = (userDataPath) => {
 //      ensureDirectory :: AbsolutePath -> IO Unit
 exports.ensureDirectory = async (userDataPath) => {
   if (!isString(userDataPath)) {
-    throw new TypeError('"userDataPath" must be a string');
+    throw new TypeError("'userDataPath' must be a string");
   }
   await fse.ensureDir(exports.getPath(userDataPath));
 };
@@ -29,12 +29,12 @@ exports.ensureDirectory = async (userDataPath) => {
 //                      IO (Promise ArrayBuffer)
 exports.createReader = (root) => {
   if (!isString(root)) {
-    throw new TypeError('"root" must be a path');
+    throw new TypeError("'root' must be a path");
   }
 
   return async (relativePath) => {
     if (!isString(relativePath)) {
-      throw new TypeError('"relativePath" must be a string');
+      throw new TypeError("'relativePath' must be a string");
     }
 
     const absolutePath = path.join(root, relativePath);
@@ -48,12 +48,12 @@ exports.createReader = (root) => {
 //                            IO (Promise RelativePath)
 exports.createWriterForNew = (root) => {
   if (!isString(root)) {
-    throw new TypeError('"root" must be a path');
+    throw new TypeError("'root' must be a path");
   }
 
   return async (arrayBuffer) => {
     if (!isArrayBuffer(arrayBuffer)) {
-      throw new TypeError('"arrayBuffer" must be an array buffer');
+      throw new TypeError("'arrayBuffer' must be an array buffer");
     }
 
     const name = exports.createName();
@@ -70,16 +70,16 @@ exports.createWriterForNew = (root) => {
 //                      IO (Promise RelativePath)
 exports.createWriterForExisting = (root) => {
   if (!isString(root)) {
-    throw new TypeError('"root" must be a path');
+    throw new TypeError("'root' must be a path");
   }
 
   return async ({ data: arrayBuffer, path: relativePath } = {}) => {
     if (!isString(relativePath)) {
-      throw new TypeError('"relativePath" must be a path');
+      throw new TypeError("'relativePath' must be a path");
     }
 
     if (!isArrayBuffer(arrayBuffer)) {
-      throw new TypeError('"arrayBuffer" must be an array buffer');
+      throw new TypeError("'arrayBuffer' must be an array buffer");
     }
 
     const buffer = Buffer.from(arrayBuffer);
@@ -95,12 +95,12 @@ exports.createWriterForExisting = (root) => {
 //                       IO Unit
 exports.createDeleter = (root) => {
   if (!isString(root)) {
-    throw new TypeError('"root" must be a path');
+    throw new TypeError("'root' must be a path");
   }
 
   return async (relativePath) => {
     if (!isString(relativePath)) {
-      throw new TypeError('"relativePath" must be a string');
+      throw new TypeError("'relativePath' must be a string");
     }
 
     const absolutePath = path.join(root, relativePath);
@@ -117,7 +117,7 @@ exports.createName = () => {
 //      getRelativePath :: String -> IO Path
 exports.getRelativePath = (name) => {
   if (!isString(name)) {
-    throw new TypeError('"name" must be a string');
+    throw new TypeError("'name' must be a string");
   }
 
   const prefix = name.slice(0, 2);
diff --git a/js/conversation_controller.js b/js/conversation_controller.js
index 05c6dc658..6696b0954 100644
--- a/js/conversation_controller.js
+++ b/js/conversation_controller.js
@@ -100,11 +100,11 @@
         },
         getOrCreate: function(id, type) {
             if (typeof id !== 'string') {
-                throw new TypeError('"id" must be a string');
+                throw new TypeError("'id' must be a string");
             }
 
             if (type !== 'private' && type !== 'group') {
-                throw new TypeError('"type" must be "private" or "group"; got: ' + type);
+                throw new TypeError(`'type' must be 'private' or 'group'; got: '${type}'`);
             }
 
             if (!this._initialFetchComplete) {
diff --git a/js/modules/backup.js b/js/modules/backup.js
index 0f9197735..b8158f6cf 100644
--- a/js/modules/backup.js
+++ b/js/modules/backup.js
@@ -496,7 +496,7 @@ async function writeAttachment(attachment, options) {
   }
 
   if (!Attachment.hasData(attachment)) {
-    throw new TypeError('"attachment.data" is required');
+    throw new TypeError("'attachment.data' is required");
   }
 
   const ciphertext = await crypto.encryptSymmetric(key, attachment.data);
diff --git a/js/modules/database.js b/js/modules/database.js
index 341ed166f..e8527d254 100644
--- a/js/modules/database.js
+++ b/js/modules/database.js
@@ -56,7 +56,7 @@ exports.getVersion = async (name) => {
 
 exports.getCount = async ({ store } = {}) => {
   if (!isObject(store)) {
-    throw new TypeError('"store" is required');
+    throw new TypeError("'store' is required");
   }
 
   const request = store.count();
diff --git a/js/modules/debug.js b/js/modules/debug.js
index b89ee17fa..5de466bca 100644
--- a/js/modules/debug.js
+++ b/js/modules/debug.js
@@ -29,15 +29,15 @@ exports.createConversation = async ({
 } = {}) => {
   if (!isObject(ConversationController) ||
       !isFunction(ConversationController.getOrCreateAndWait)) {
-    throw new TypeError('"ConversationController" is required');
+    throw new TypeError("'ConversationController' is required");
   }
 
   if (!isNumber(numMessages) || numMessages <= 0) {
-    throw new TypeError('"numMessages" must be a positive number');
+    throw new TypeError("'numMessages' must be a positive number");
   }
 
   if (!isFunction(WhisperMessage)) {
-    throw new TypeError('"WhisperMessage" is required');
+    throw new TypeError("'WhisperMessage' is required");
   }
 
   const conversation =
@@ -80,7 +80,7 @@ const SAMPLE_MESSAGES = [
 const ATTACHMENT_SAMPLE_RATE = 0.33;
 const createRandomMessage = async ({ conversationId } = {}) => {
   if (!isString(conversationId)) {
-    throw new TypeError('"conversationId" must be a string');
+    throw new TypeError("'conversationId' must be a string");
   }
 
   const sentAt = Date.now() - random(100 * 24 * 60 * 60 * 1000);
diff --git a/js/modules/messages_data_migrator.js b/js/modules/messages_data_migrator.js
index c81d71daa..3f70f0f87 100644
--- a/js/modules/messages_data_migrator.js
+++ b/js/modules/messages_data_migrator.js
@@ -29,20 +29,20 @@ exports.processNext = async ({
   upgradeMessageSchema,
 } = {}) => {
   if (!isFunction(BackboneMessage)) {
-    throw new TypeError('"BackboneMessage" (Whisper.Message) constructor is required');
+    throw new TypeError("'BackboneMessage' (Whisper.Message) constructor is required");
   }
 
   if (!isFunction(BackboneMessageCollection)) {
-    throw new TypeError('"BackboneMessageCollection" (Whisper.MessageCollection)' +
+    throw new TypeError("'BackboneMessageCollection' (Whisper.MessageCollection)" +
       ' constructor is required');
   }
 
   if (!isNumber(numMessagesPerBatch)) {
-    throw new TypeError('"numMessagesPerBatch" is required');
+    throw new TypeError("'numMessagesPerBatch' is required");
   }
 
   if (!isFunction(upgradeMessageSchema)) {
-    throw new TypeError('"upgradeMessageSchema" is required');
+    throw new TypeError("'upgradeMessageSchema' is required");
   }
 
   const startTime = Date.now();
@@ -85,19 +85,19 @@ exports.dangerouslyProcessAllWithoutIndex = async ({
   upgradeMessageSchema,
 } = {}) => {
   if (!isString(databaseName)) {
-    throw new TypeError('"databaseName" must be a string');
+    throw new TypeError("'databaseName' must be a string");
   }
 
   if (!isNumber(minDatabaseVersion)) {
-    throw new TypeError('"minDatabaseVersion" must be a number');
+    throw new TypeError("'minDatabaseVersion' must be a number");
   }
 
   if (!isNumber(numMessagesPerBatch)) {
-    throw new TypeError('"numMessagesPerBatch" must be a number');
+    throw new TypeError("'numMessagesPerBatch' must be a number");
   }
 
   if (!isFunction(upgradeMessageSchema)) {
-    throw new TypeError('"upgradeMessageSchema" is required');
+    throw new TypeError("'upgradeMessageSchema' is required");
   }
 
   const connection = await database.open(databaseName);
@@ -155,7 +155,7 @@ exports.processNextBatchWithoutIndex = async ({
   upgradeMessageSchema,
 } = {}) => {
   if (!isFunction(upgradeMessageSchema)) {
-    throw new TypeError('"upgradeMessageSchema" is required');
+    throw new TypeError("'upgradeMessageSchema' is required");
   }
 
   const connection = await _getConnection({ databaseName, minDatabaseVersion });
@@ -170,11 +170,11 @@ exports.processNextBatchWithoutIndex = async ({
 // Private API
 const _getConnection = async ({ databaseName, minDatabaseVersion }) => {
   if (!isString(databaseName)) {
-    throw new TypeError('"databaseName" must be a string');
+    throw new TypeError("'databaseName' must be a string");
   }
 
   if (!isNumber(minDatabaseVersion)) {
-    throw new TypeError('"minDatabaseVersion" must be a number');
+    throw new TypeError("'minDatabaseVersion' must be a number");
   }
 
   const connection = await database.open(databaseName);
@@ -194,15 +194,15 @@ const _processBatch = async ({
   upgradeMessageSchema,
 } = {}) => {
   if (!isObject(connection)) {
-    throw new TypeError('"connection" must be a string');
+    throw new TypeError("'connection' must be a string");
   }
 
   if (!isFunction(upgradeMessageSchema)) {
-    throw new TypeError('"upgradeMessageSchema" is required');
+    throw new TypeError("'upgradeMessageSchema' is required");
   }
 
   if (!isNumber(numMessagesPerBatch)) {
-    throw new TypeError('"numMessagesPerBatch" is required');
+    throw new TypeError("'numMessagesPerBatch' is required");
   }
 
   const isAttachmentMigrationComplete =
@@ -273,7 +273,7 @@ const _saveMessageBackbone = ({ BackboneMessage } = {}) => (message) => {
 
 const _saveMessage = ({ transaction } = {}) => (message) => {
   if (!isObject(transaction)) {
-    throw new TypeError('"transaction" is required');
+    throw new TypeError("'transaction' is required");
   }
 
   const messagesStore = transaction.objectStore(MESSAGES_STORE_NAME);
@@ -289,12 +289,12 @@ const _saveMessage = ({ transaction } = {}) => (message) => {
 const _fetchMessagesRequiringSchemaUpgrade =
   async ({ BackboneMessageCollection, count } = {}) => {
     if (!isFunction(BackboneMessageCollection)) {
-      throw new TypeError('"BackboneMessageCollection" (Whisper.MessageCollection)' +
+      throw new TypeError("'BackboneMessageCollection' (Whisper.MessageCollection)" +
         ' constructor is required');
     }
 
     if (!isNumber(count)) {
-      throw new TypeError('"count" is required');
+      throw new TypeError("'count' is required");
     }
 
     const collection = new BackboneMessageCollection();
@@ -318,15 +318,15 @@ const _fetchMessagesRequiringSchemaUpgrade =
 const _dangerouslyFetchMessagesRequiringSchemaUpgradeWithoutIndex =
   ({ connection, count, lastIndex } = {}) => {
     if (!isObject(connection)) {
-      throw new TypeError('"connection" is required');
+      throw new TypeError("'connection' is required");
     }
 
     if (!isNumber(count)) {
-      throw new TypeError('"count" is required');
+      throw new TypeError("'count' is required");
     }
 
     if (lastIndex && !isString(lastIndex)) {
-      throw new TypeError('"lastIndex" must be a string');
+      throw new TypeError("'lastIndex' must be a string");
     }
 
     const hasLastIndex = Boolean(lastIndex);
@@ -359,7 +359,7 @@ const _dangerouslyFetchMessagesRequiringSchemaUpgradeWithoutIndex =
 
 const _getNumMessages = async ({ connection } = {}) => {
   if (!isObject(connection)) {
-    throw new TypeError('"connection" is required');
+    throw new TypeError("'connection' is required");
   }
 
   const transaction = connection.transaction(MESSAGES_STORE_NAME, 'readonly');
diff --git a/js/modules/migrations/run_migrations.js b/js/modules/migrations/run_migrations.js
index cc54a408c..9db4d5020 100644
--- a/js/modules/migrations/run_migrations.js
+++ b/js/modules/migrations/run_migrations.js
@@ -19,12 +19,12 @@ const closeDatabaseConnection = ({ Backbone } = {}) =>
 exports.runMigrations = async ({ Backbone, database } = {}) => {
   if (!isObject(Backbone) || !isObject(Backbone.Collection) ||
       !isFunction(Backbone.Collection.extend)) {
-    throw new TypeError('"Backbone" is required');
+    throw new TypeError("'Backbone' is required");
   }
 
   if (!isObject(database) || !isString(database.id) ||
       !Array.isArray(database.migrations)) {
-    throw new TypeError('"database" is required');
+    throw new TypeError("'database' is required");
   }
 
   const {
@@ -58,7 +58,7 @@ exports.runMigrations = async ({ Backbone, database } = {}) => {
 
 const getMigrationVersions = (database) => {
   if (!isObject(database) || !Array.isArray(database.migrations)) {
-    throw new TypeError('"database" is required');
+    throw new TypeError("'database' is required");
   }
 
   const firstMigration = head(database.migrations);
diff --git a/js/modules/privacy.js b/js/modules/privacy.js
index b3cf2cef2..e476a6b22 100644
--- a/js/modules/privacy.js
+++ b/js/modules/privacy.js
@@ -16,14 +16,14 @@ const REDACTION_PLACEHOLDER = '[REDACTED]';
 //      _redactPath :: Path -> String -> String
 exports._redactPath = (filePath) => {
   if (!is.string(filePath)) {
-    throw new TypeError('"filePath" must be a string');
+    throw new TypeError("'filePath' must be a string");
   }
 
   const filePathPattern = exports._pathToRegExp(filePath);
 
   return (text) => {
     if (!is.string(text)) {
-      throw new TypeError('"text" must be a string');
+      throw new TypeError("'text' must be a string");
     }
 
     if (!is.regExp(filePathPattern)) {
@@ -58,7 +58,7 @@ exports._pathToRegExp = (filePath) => {
 //      redactPhoneNumbers :: String -> String
 exports.redactPhoneNumbers = (text) => {
   if (!is.string(text)) {
-    throw new TypeError('"text" must be a string');
+    throw new TypeError("'text' must be a string");
   }
 
   return text.replace(PHONE_NUMBER_PATTERN, `+${REDACTION_PLACEHOLDER}$1`);
@@ -67,7 +67,7 @@ exports.redactPhoneNumbers = (text) => {
 //      redactGroupIds :: String -> String
 exports.redactGroupIds = (text) => {
   if (!is.string(text)) {
-    throw new TypeError('"text" must be a string');
+    throw new TypeError("'text' must be a string");
   }
 
   return text.replace(
diff --git a/js/modules/settings.js b/js/modules/settings.js
index a4c609ccd..1d63b1e5b 100644
--- a/js/modules/settings.js
+++ b/js/modules/settings.js
@@ -26,11 +26,11 @@ exports.markAttachmentMigrationComplete = connection =>
 // Private API
 exports._getItem = (connection, key) => {
   if (!isObject(connection)) {
-    throw new TypeError('"connection" is required');
+    throw new TypeError("'connection' is required");
   }
 
   if (!isString(key)) {
-    throw new TypeError('"key" must be a string');
+    throw new TypeError("'key' must be a string");
   }
 
   const transaction = connection.transaction(ITEMS_STORE_NAME, 'readonly');
@@ -47,11 +47,11 @@ exports._getItem = (connection, key) => {
 
 exports._setItem = (connection, key, value) => {
   if (!isObject(connection)) {
-    throw new TypeError('"connection" is required');
+    throw new TypeError("'connection' is required");
   }
 
   if (!isString(key)) {
-    throw new TypeError('"key" must be a string');
+    throw new TypeError("'key' must be a string");
   }
 
   const transaction = connection.transaction(ITEMS_STORE_NAME, 'readwrite');
@@ -68,11 +68,11 @@ exports._setItem = (connection, key, value) => {
 
 exports._deleteItem = (connection, key) => {
   if (!isObject(connection)) {
-    throw new TypeError('"connection" is required');
+    throw new TypeError("'connection' is required");
   }
 
   if (!isString(key)) {
-    throw new TypeError('"key" must be a string');
+    throw new TypeError("'key' must be a string");
   }
 
   const transaction = connection.transaction(ITEMS_STORE_NAME, 'readwrite');
diff --git a/js/modules/startup.js b/js/modules/startup.js
index fc60861de..06d950623 100644
--- a/js/modules/startup.js
+++ b/js/modules/startup.js
@@ -10,15 +10,15 @@ exports.syncReadReceiptConfiguration = async ({
   storage,
 }) => {
   if (!is.string(deviceId)) {
-    throw new TypeError('"deviceId" is required');
+    throw new TypeError("'deviceId' is required");
   }
 
   if (!is.function(sendRequestConfigurationSyncMessage)) {
-    throw new TypeError('"sendRequestConfigurationSyncMessage" is required');
+    throw new TypeError("'sendRequestConfigurationSyncMessage' is required");
   }
 
   if (!is.object(storage)) {
-    throw new TypeError('"storage" is required');
+    throw new TypeError("'storage' is required");
   }
 
   const isPrimaryDevice = deviceId === '1';
diff --git a/js/modules/string_to_array_buffer.js b/js/modules/string_to_array_buffer.js
index 4c6fa700c..3ddd19d5b 100644
--- a/js/modules/string_to_array_buffer.js
+++ b/js/modules/string_to_array_buffer.js
@@ -1,6 +1,6 @@
 exports.stringToArrayBuffer = (string) => {
   if (typeof string !== 'string') {
-    throw new TypeError('"string" must be a string');
+    throw new TypeError("'string' must be a string");
   }
 
   const array = new Uint8Array(string.length);
diff --git a/js/modules/types/attachment.js b/js/modules/types/attachment.js
index c807afc2b..06298b284 100644
--- a/js/modules/types/attachment.js
+++ b/js/modules/types/attachment.js
@@ -116,12 +116,12 @@ exports.hasData = attachment =>
 //                  IO (Promise Attachment)
 exports.loadData = (readAttachmentData) => {
   if (!isFunction(readAttachmentData)) {
-    throw new TypeError('"readAttachmentData" must be a function');
+    throw new TypeError("'readAttachmentData' must be a function");
   }
 
   return async (attachment) => {
     if (!exports.isValid(attachment)) {
-      throw new TypeError('"attachment" is not valid');
+      throw new TypeError("'attachment' is not valid");
     }
 
     const isAlreadyLoaded = exports.hasData(attachment);
@@ -130,7 +130,7 @@ exports.loadData = (readAttachmentData) => {
     }
 
     if (!isString(attachment.path)) {
-      throw new TypeError('"attachment.path" is required');
+      throw new TypeError("'attachment.path' is required");
     }
 
     const data = await readAttachmentData(attachment.path);
@@ -143,12 +143,12 @@ exports.loadData = (readAttachmentData) => {
 //                    IO Unit
 exports.deleteData = (deleteAttachmentData) => {
   if (!isFunction(deleteAttachmentData)) {
-    throw new TypeError('"deleteAttachmentData" must be a function');
+    throw new TypeError("'deleteAttachmentData' must be a function");
   }
 
   return async (attachment) => {
     if (!exports.isValid(attachment)) {
-      throw new TypeError('"attachment" is not valid');
+      throw new TypeError("'attachment' is not valid");
     }
 
     const hasDataInMemory = exports.hasData(attachment);
@@ -157,7 +157,7 @@ exports.deleteData = (deleteAttachmentData) => {
     }
 
     if (!isString(attachment.path)) {
-      throw new TypeError('"attachment.path" is required');
+      throw new TypeError("'attachment.path' is required");
     }
 
     await deleteAttachmentData(attachment.path);
diff --git a/js/modules/types/attachment/migrate_data_to_file_system.js b/js/modules/types/attachment/migrate_data_to_file_system.js
index 9fa4fc83d..debf2d2ca 100644
--- a/js/modules/types/attachment/migrate_data_to_file_system.js
+++ b/js/modules/types/attachment/migrate_data_to_file_system.js
@@ -15,7 +15,7 @@ const {
 //                                 Promise Attachment
 exports.migrateDataToFileSystem = async (attachment, { writeNewAttachmentData } = {}) => {
   if (!isFunction(writeNewAttachmentData)) {
-    throw new TypeError('"writeNewAttachmentData" must be a function');
+    throw new TypeError("'writeNewAttachmentData' must be a function");
   }
 
   const { data } = attachment;
diff --git a/js/modules/types/message.js b/js/modules/types/message.js
index f8d5f40c1..f17bcf88b 100644
--- a/js/modules/types/message.js
+++ b/js/modules/types/message.js
@@ -81,10 +81,10 @@ exports.initializeSchemaVersion = (message) => {
 // SchemaVersion -> UpgradeStep -> UpgradeStep
 exports._withSchemaVersion = (schemaVersion, upgrade) => {
   if (!SchemaVersion.isValid(schemaVersion)) {
-    throw new TypeError('"schemaVersion" is invalid');
+    throw new TypeError("'schemaVersion' is invalid");
   }
   if (!isFunction(upgrade)) {
-    throw new TypeError('"upgrade" must be a function');
+    throw new TypeError("'upgrade' must be a function");
   }
 
   return async (message, context) => {
@@ -192,12 +192,12 @@ exports.createAttachmentLoader = (loadAttachmentData) => {
 //                                    IO (Promise Message)
 exports.createAttachmentDataWriter = (writeExistingAttachmentData) => {
   if (!isFunction(writeExistingAttachmentData)) {
-    throw new TypeError('"writeExistingAttachmentData" must be a function');
+    throw new TypeError("'writeExistingAttachmentData' must be a function");
   }
 
   return async (rawMessage) => {
     if (!exports.isValid(rawMessage)) {
-      throw new TypeError('"rawMessage" is not valid');
+      throw new TypeError("'rawMessage' is not valid");
     }
 
     const message = exports.initializeSchemaVersion(rawMessage);
@@ -217,11 +217,11 @@ exports.createAttachmentDataWriter = (writeExistingAttachmentData) => {
 
     attachments.forEach((attachment) => {
       if (!Attachment.hasData(attachment)) {
-        throw new TypeError('"attachment.data" is required during message import');
+        throw new TypeError("'attachment.data' is required during message import");
       }
 
       if (!isString(attachment.path)) {
-        throw new TypeError('"attachment.path" is required during message import');
+        throw new TypeError("'attachment.path' is required during message import");
       }
     });
 
diff --git a/test/modules/types/message_test.js b/test/modules/types/message_test.js
index c9c4b5881..7a8af0223 100644
--- a/test/modules/types/message_test.js
+++ b/test/modules/types/message_test.js
@@ -246,14 +246,14 @@ describe('Message', () => {
       const toVersionX = () => {};
       assert.throws(
         () => Message._withSchemaVersion(toVersionX, 2),
-        '"schemaVersion" is invalid'
+        "'schemaVersion' is invalid"
       );
     });
 
     it('should require an upgrade function', () => {
       assert.throws(
         () => Message._withSchemaVersion(2, 3),
-        '"upgrade" must be a function'
+        "'upgrade' must be a function"
       );
     });