fix #1959 - LCS (#2129)

* fix #1959 - LCS

* newlines at end of files

packages/client/lib/commands/LCS_LEN.ts

@@ -0,0 +1,15 @@
+import { RedisCommandArgument, RedisCommandArguments } from '.';
+import { transformArguments as transformLcsArguments } from './LCS';
+
+export { FIRST_KEY_INDEX, IS_READ_ONLY } from './LCS';
+
+export function transformArguments(
+    key1: RedisCommandArgument,
+    key2: RedisCommandArgument
+): RedisCommandArguments {
+    const args = transformLcsArguments(key1, key2);
+    args.push('LEN');
+    return args;
+}
+
+export declare function transformReply(): number;