add types for exists with callback

types/ioredis/index.d.ts

@@ -107,6 +107,7 @@ declare namespace IORedis {
         del(...keys: KeyType[]): Promise<number>;
 
         exists(...keys: KeyType[]): Promise<number>;
+        exists(key: KeyType, callback: (err: Error, res: number) => void): void;
 
         setbit(key: KeyType, offset: number, value: any, callback: (err: Error, res: number) => void): void;
         setbit(key: KeyType, offset: number, value: any): Promise<number>;

types/ioredis/ioredis-tests.ts

@@ -38,6 +38,7 @@ redis.set('key', '100', ['EX', 10, 'NX'], (err, data) => {});
 redis.setBuffer('key', '100', 'NX', 'EX', 10, (err, data) => {});
 
 redis.exists('foo').then(result => result * 1);
+redis.exists('foo', ((err, data) => data * 1));
 
 // Should support usage of Buffer
 redis.set(Buffer.from('key'), '100');

types/ioredis/v3/index.d.ts

@@ -103,6 +103,7 @@ declare namespace IORedis {
         del(...keys: string[]): any;
 
         exists(...keys: string[]): Promise<number>;
+        exists(key: string, callback: (err: Error, res: number) => void): void;
 
         setbit(key: string, offset: number, value: any, callback: (err: Error, res: number) => void): void;
         setbit(key: string, offset: number, value: any): Promise<number>;

types/ioredis/v3/ioredis-tests.ts

@@ -32,6 +32,7 @@ redis.set('key', '100', ['EX', 10, 'NX'], (err, data) => {});
 redis.setBuffer('key', '100', 'NX', 'EX', 10, (err, data) => {});
 
 redis.exists('foo').then(result => result * 1);
+redis.exists('foo', ((err, data) => data * 1));
 
 new Redis();       // Connect to 127.0.0.1:6379
 new Redis(6380);   // 127.0.0.1:6380