diff --git a/client-ts/Microsoft.AspNetCore.Client.SignalR.TS.Tests/Formatters.spec.ts b/client-ts/Microsoft.AspNetCore.Client.SignalR.TS.Tests/Formatters.spec.ts
index d980478845..eac4b9d09e 100644
--- a/client-ts/Microsoft.AspNetCore.Client.SignalR.TS.Tests/Formatters.spec.ts
+++ b/client-ts/Microsoft.AspNetCore.Client.SignalR.TS.Tests/Formatters.spec.ts
@@ -20,18 +20,18 @@ describe("Text Message Formatter", () => {
     });
 
     ([
-        ["TABC", "Invalid length: 'ABC'"],
-        ["X1:T:A", "Unsupported message format: 'X'"],
-        ["T1:T:A;12ab34:", "Invalid length: '12ab34'"],
-        ["T1:T:A;1:asdf:", "Unknown type value: 'asdf'"],
-        ["T1:T:A;1::", "Message is incomplete"],
-        ["T1:T:A;1:AB:", "Message is incomplete"],
-        ["T1:T:A;5:T:A", "Message is incomplete"],
-        ["T1:T:A;5:T:AB", "Message is incomplete"],
-        ["T1:T:A;5:T:ABCDE", "Message is incomplete"],
-        ["T1:T:A;5:X:ABCDE", "Message is incomplete"],
-        ["T1:T:A;5:T:ABCDEF", "Message missing trailer character"],
-    ] as [[string, string]]).forEach(([payload, expected_error]) => {
+        ["TABC", new Error("Invalid length: 'ABC'")],
+        ["X1:T:A", new Error("Unsupported message format: 'X'")],
+        ["T1:T:A;12ab34:", new Error("Invalid length: '12ab34'")],
+        ["T1:T:A;1:asdf:", new Error("Unknown type value: 'asdf'")],
+        ["T1:T:A;1::", new Error("Message is incomplete")],
+        ["T1:T:A;1:AB:", new Error("Message is incomplete")],
+        ["T1:T:A;5:T:A", new Error("Message is incomplete")],
+        ["T1:T:A;5:T:AB", new Error("Message is incomplete")],
+        ["T1:T:A;5:T:ABCDE", new Error("Message is incomplete")],
+        ["T1:T:A;5:X:ABCDE", new Error("Message is incomplete")],
+        ["T1:T:A;5:T:ABCDEF", new Error("Message missing trailer character")],
+    ] as [[string, Error]]).forEach(([payload, expected_error]) => {
         it(`should fail to parse '${payload}'`, () => {
             expect(() => TextMessageFormat.parse(payload)).toThrow(expected_error);
         });
@@ -40,10 +40,10 @@ describe("Text Message Formatter", () => {
 
 describe("Server-Sent Events Formatter", () => {
     ([
-        ["", "Message is missing header"],
-        ["A", "Unknown type value: 'A'"],
-        ["BOO\r\nBlarg", "Unknown type value: 'BOO'"]
-    ] as [string, string][]).forEach(([payload, expected_error]) => {
+        ["", new Error("Message is missing header")],
+        ["A", new Error("Unknown type value: 'A'")],
+        ["BOO\r\nBlarg", new Error("Unknown type value: 'BOO'")]
+    ] as [string, Error][]).forEach(([payload, expected_error]) => {
         it(`should fail to parse '${payload}`, () => {
             expect(() => ServerSentEventsFormat.parse(payload)).toThrow(expected_error);
         });
diff --git a/client-ts/Microsoft.AspNetCore.SignalR.Client.TS/Formatters.ts b/client-ts/Microsoft.AspNetCore.SignalR.Client.TS/Formatters.ts
index a079e03088..8dcb56d6d6 100644
--- a/client-ts/Microsoft.AspNetCore.SignalR.Client.TS/Formatters.ts
+++ b/client-ts/Microsoft.AspNetCore.SignalR.Client.TS/Formatters.ts
@@ -22,7 +22,7 @@ export namespace ServerSentEventsFormat {
         // Binary messages require Base64-decoding and ArrayBuffer support, just like in the other formats below
 
         if (input.length == 0) {
-            throw "Message is missing header";
+            throw new Error("Message is missing header");
         }
 
         let [header, offset] = splitAt(input, "\n", 0);
@@ -36,7 +36,7 @@ export namespace ServerSentEventsFormat {
         // Parse the header
         var messageType = knownTypes[header];
         if (messageType === undefined) {
-            throw "Unknown type value: '" + header + "'";
+            throw new Error(`Unknown type value: '${header}'`);
         }
 
         if (messageType == MessageType.Binary) {
@@ -44,7 +44,7 @@ export namespace ServerSentEventsFormat {
             // This will require our own Base64-decoder because the browser
             // built-in one only decodes to strings and throws if invalid UTF-8
             // characters are found.
-            throw "TODO: Support for binary messages";
+            throw new Error("TODO: Support for binary messages");
         }
 
         // Create the message
@@ -70,13 +70,13 @@ export namespace TextMessageFormat {
         // parseInt is too leniant, we need a strict check to see if the string is an int
 
         if (!LengthRegex.test(lenStr)) {
-            throw `Invalid length: '${lenStr}'`;
+            throw new Error(`Invalid length: '${lenStr}'`);
         }
         let length = Number.parseInt(lenStr);
 
         // Required space is: 3 (type flag, ":", ";") + length (payload len)
         if (!hasSpace(input, offset, 3 + length)) {
-            throw "Message is incomplete";
+            throw new Error("Message is incomplete");
         }
 
         // Read the type
@@ -85,7 +85,7 @@ export namespace TextMessageFormat {
         // Parse the type
         var messageType = knownTypes[typeStr];
         if (messageType === undefined) {
-            throw "Unknown type value: '" + typeStr + "'";
+            throw new Error(`Unknown type value: '${typeStr}'`);
         }
 
         // Read the payload
@@ -94,7 +94,7 @@ export namespace TextMessageFormat {
 
         // Verify the final trailing character
         if (input[offset] != ';') {
-            throw "Message missing trailer character";
+            throw new Error("Message missing trailer character");
         }
         offset += 1;
 
@@ -103,7 +103,7 @@ export namespace TextMessageFormat {
             // This will require our own Base64-decoder because the browser
             // built-in one only decodes to strings and throws if invalid UTF-8
             // characters are found.
-            throw "TODO: Support for binary messages";
+            throw new Error("TODO: Support for binary messages");
         }
 
         return [offset, new Message(messageType, payload)];
@@ -115,7 +115,7 @@ export namespace TextMessageFormat {
         }
 
         if (input[0] != 'T') {
-            throw `Unsupported message format: '${input[0]}'`;
+            throw new Error(`Unsupported message format: '${input[0]}'`);
         }
 
         let messages = [];