clean SET command

README.md

@@ -92,8 +92,11 @@ Modifiers to commands are specified using a JavaScript object:
 
 ```typescript
 await client.set('key', 'value', {
-  EX: 10,
-  NX: true
+  expiration: {
+    type: 'EX',
+    value: 10
+  },
+  condition: 'NX'
 });
 ```
 
@@ -108,10 +111,9 @@ await client.hVals('key'); // ['value1', 'value2']
 
 ```typescript
 await client.hSet('key', 'field', Buffer.from('value')); // 'OK'
-await client.hGetAll(
-  commandOptions({ returnBuffers: true }),
-  'key'
-); // { field: <Buffer 76 61 6c 75 65> }
+await client.withFlags({
+  [TYPES.BLOB_STRING]: Buffer
+}).hGetAll('key'); // { field: <Buffer 76 61 6c 75 65> }
 ```
 
 ### Unsupported Redis Commands
@@ -151,8 +153,7 @@ This pattern works especially well for blocking commands—such as `BLPOP` and `
 ```typescript
 import { commandOptions } from 'redis';
 
-const blPopPromise = client.blPop(
-  commandOptions({ isolated: true }),
+const blPopPromise = client.isolated().blPop(
   'key',
   0
 );

packages/client/lib/commands/SET.ts

@@ -1,27 +1,46 @@
 import { RedisArgument, SimpleStringReply, BlobStringReply, NullReply, Command } from '../RESP/types';
 
-type MaximumOneOf<T, K extends keyof T = keyof T> =
-  K extends keyof T ? { [P in K]?: T[K] } & Partial<Record<Exclude<keyof T, K>, never>> : never;
+interface SetOptions {
+  expiration?: {
+    type: 'EX' | 'PX' | 'EXAT' | 'PXAT';
+    value: number;
+  } | {
+    type: 'KEEPTTL';
+  } | 'KEEPTTL';
+  /**
+   * @deprecated Use `expiration` { type: 'EX', value: number } instead
+   */
+  EX?: number;
+  /**
+   * @deprecated Use `expiration` { type: 'PX', value: number } instead
+   */
+  PX?: number;
+  /**
+   * @deprecated Use `expiration` { type: 'EXAT', value: number } instead
+   */
+  EXAT?: number;
+  /**
+   * @deprecated Use `expiration` { type: 'PXAT', value: number } instead
+   */
+  PXAT?: number;
+  /**
+   * @deprecated Use `expiration` 'KEEPTTL' instead
+   */
+  KEEPTTL?: boolean;
 
-type SetTTL = MaximumOneOf<{
-  EX: number;
-  PX: number;
-  EXAT: number;
-  PXAT: number;
-  KEEPTTL: true;
-}>;
-
-type SetGuards = MaximumOneOf<{
-  NX: true;
-  XX: true;
-}>;
-
-interface SetCommonOptions {
-  GET?: true;
+  condition?: 'NX' | 'XX';
+  /**
+   * @deprecated Use `condition` 'NX' instead
+   */
+  NX?: boolean;
+  /**
+   * @deprecated Use `condition` 'XX' instead
+   */
+  XX?: boolean;
+  
+  GET?: boolean;
 }
 
-export type SetOptions = SetTTL & SetGuards & SetCommonOptions;
-
 export default {
   FIRST_KEY_INDEX: 1,
   transformArguments(key: RedisArgument, value: RedisArgument | number, options?: SetOptions) {
@@ -31,7 +50,18 @@ export default {
       typeof value === 'number' ? value.toString() : value
     ];
 
-    if (options?.EX !== undefined) {
+    if (options?.expiration) {
+      if (typeof options.expiration === 'string') {
+        args.push(options.expiration);
+      } else if (options.expiration.type === 'KEEPTTL') {
+        args.push('KEEPTTL');
+      } else {
+        args.push(
+          options.expiration.type,
+          options.expiration.value.toString()
+        );
+      }
+    } else if (options?.EX !== undefined) {
       args.push('EX', options.EX.toString());
     } else if (options?.PX !== undefined) {
       args.push('PX', options.PX.toString());
@@ -43,7 +73,9 @@ export default {
       args.push('KEEPTTL');
     }
 
-    if (options?.NX) {
+    if (options?.condition) {
+      args.push(options.condition);
+    } else if (options?.NX) {
       args.push('NX');
     } else if (options?.XX) {
       args.push('XX');