Knex - Add connection Client for extension.

types/knex/index.d.ts

@@ -1,6 +1,9 @@
 // Type definitions for Knex.js
 // Project: https://github.com/tgriesser/knex
-// Definitions by: Qubo <https://github.com/tkQubo>, Baronfel <https://github.com/baronfel>, Pablo Rodríguez <https://github.com/MeLlamoPablo>
+// Definitions by: Qubo <https://github.com/tkQubo>
+//                 Baronfel <https://github.com/baronfel>
+//                 Pablo Rodríguez <https://github.com/MeLlamoPablo>
+//                 Matt R. Wilson <https://github.com/mastermatt>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.3
 
@@ -510,7 +513,7 @@ declare namespace Knex {
 
     interface Config {
         debug?: boolean;
-        client?: string;
+        client?: string | typeof Client;
         dialect?: string;
         version?: string;
         connection?: string | ConnectionConfig | MariaSqlConnectionConfig |
@@ -676,6 +679,22 @@ declare namespace Knex {
     interface FunctionHelper {
         now(): Raw;
     }
+
+    //
+    // Clients
+    //
+
+    class Client extends events.EventEmitter {
+      constructor(config: Config);
+      config: Config;
+      dialect: string;
+      driverName: string;
+      connectionSettings: object;
+
+      acquireRawConnection(): Promise<any>;
+      destroyRawConnection(connection: any): Promise<void>;
+      validateConnection(connection: any): Promise<boolean>;
+    }
 }
 
 export = Knex;

types/knex/knex-tests.ts

@@ -128,6 +128,13 @@ var knex = Knex({
   useNullAsDefault: true,
 });
 
+// Using custom client
+class TestClient extends Knex.Client {}
+
+var knex = Knex({
+  client: TestClient,
+});
+
 knex('books').insert({title: 'Test'}).returning('*').toString();
 
 // Migrations