[CONJS-136] typescript error when trying to use SqlError interface

Author: rusher

types/index.d.ts

@@ -647,6 +647,21 @@ export interface SqlError extends Error {
   fatal: boolean;
 }
 
+interface SqlErrorConstructor extends ErrorConstructor {
+  new (
+      msg: string,
+      fatal?: boolean,
+      info?: { threadId?: number },
+      sqlState?: string | null,
+      errno?: number,
+      additionalStack?: string,
+      addHeader?: boolean,
+  ): SqlError;
+  readonly prototype: SqlError;
+}
+
+declare var SqlError: SqlErrorConstructor;
+
 export const enum TypeNumbers {
   DECIMAL = 0,
   TINY = 1,