copy common ts code over from browser repo

src/models/response/errorResponse.ts

@@ -0,0 +1,37 @@
+class ErrorResponse {
+    message: string;
+    validationErrors: { [key: string]: string[]; };
+    statusCode: number;
+
+    constructor(response: any, status: number, identityResponse?: boolean) {
+        let errorModel = null;
+        if (identityResponse && response && response.ErrorModel) {
+            errorModel = response.ErrorModel;
+        } else if (response) {
+            errorModel = response;
+        }
+
+        if (errorModel) {
+            this.message = errorModel.Message;
+            this.validationErrors = errorModel.ValidationErrors;
+        }
+        this.statusCode = status;
+    }
+
+    getSingleMessage(): string {
+        if (this.validationErrors) {
+            for (const key in this.validationErrors) {
+                if (!this.validationErrors.hasOwnProperty(key)) {
+                    continue;
+                }
+                if (this.validationErrors[key].length) {
+                    return this.validationErrors[key][0];
+                }
+            }
+        }
+        return this.message;
+    }
+}
+
+export { ErrorResponse };
+(window as any).ErrorResponse = ErrorResponse;