fix #1724 - fix LINDEX signature

Author: leibale

packages/client/lib/commands/LINDEX.spec.ts

@@ -5,21 +5,21 @@ import { transformArguments } from './LINDEX';
 describe('LINDEX', () => {
     it('transformArguments', () => {
         assert.deepEqual(
-            transformArguments('key', 'element'),
-            ['LINDEX', 'key', 'element']
+            transformArguments('key', 0),
+            ['LINDEX', 'key', '0']
         );
     });
 
     testUtils.testWithClient('client.lIndex', async client => {
         assert.equal(
-            await client.lIndex('key', 'element'),
+            await client.lIndex('key', 0),
             null
         );
     }, GLOBAL.SERVERS.OPEN);
 
     testUtils.testWithCluster('cluster.lIndex', async cluster => {
         assert.equal(
-            await cluster.lIndex('key', 'element'),
+            await cluster.lIndex('key', 0),
             null
         );
     }, GLOBAL.CLUSTERS.OPEN);

packages/client/lib/commands/LINDEX.ts

@@ -2,8 +2,8 @@ export const FIRST_KEY_INDEX = 1;
 
 export const IS_READ_ONLY = true;
 
-export function transformArguments(key: string, element: string): Array<string> {
-    return ['LINDEX', key, element];
+export function transformArguments(key: string, index: number): Array<string> {
+    return ['LINDEX', key, index.toString()];
 }
 
 export declare function transformReply(): string | null;