update docs, add 6.0.x to the tests matrix, add eslint, npm update, fix some commands, fix some types

Co-authored-by: Simon Prickett <simon@crudworks.org>

.eslintrc.json

@@ -0,0 +1,12 @@
+{
+    "root": true,
+    "parser": "@typescript-eslint/parser",
+    "plugins": [
+      "@typescript-eslint"
+    ],
+    "extends": [
+      "eslint:recommended",
+      "plugin:@typescript-eslint/eslint-recommended",
+      "plugin:@typescript-eslint/recommended"
+    ]
+  }

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         node-version: [12.x, 14.x, 16.x]
-        redis-version: [5.x, 6.x]
+        redis-version: [5.x, 6.0.x, 6.2.x]
 
     steps:
       - uses: actions/checkout@v2.3.4

README.md

@@ -57,7 +57,7 @@ createClient({
 });
 ```
 
-You can also use discrete parameters, UNIX sockets, and even TLS to connect. Details can be found in in the [Wiki](https://github.com/redis/node-redis/wiki/lib.socket#RedisSocketOptions).
+You can also use discrete parameters, UNIX sockets, and even TLS to connect. Details can be found in the [client configuration guide](./docs/client-configuration.md).
 
 ### Redis Commands
 
@@ -227,32 +227,34 @@ import { createClient, defineScript } from 'redis';
 })();
 ```
 
-### Cluster
+### Disconnecting
 
-Connecting to a cluster is a bit different. Create the client by specifying some (or all) of the nodes in your cluster and then use it like a non-clustered client:
+There are two functions that disconnect a client from the Redis server. In most scenarios you should use `.quit()` to ensure that pending commands are sent to Redis before closing a connection.
+
+#### `.QUIT()`/`.quit()`
+
+Gracefully close a client's connection to Redis, by sending the [`QUIT`](https://redis.io/commands/quit) command to the server. Before quitting, the client executes any remaining commands in its queue, and will receive replies from Redis for each of them.
 
 ```typescript
-import { createCluster } from 'redis';
+const [ping, get, quit] = await Promise.all([
+  client.ping(),
+  client.get('key'),
+  client.quit()
+]); // ['PONG', null, 'OK']
 
-(async () => {
-  const cluster = createCluster({
-    rootNodes: [
-      {
-        url: 'redis://10.0.0.1:30001'
-      },
-      {
-        url: 'redis://10.0.0.2:30002'
-      }
-    ]
-  });
+try {
+  await client.get('key');
+} catch (err) {
+  // ClosedClient Error
+}
+```
 
-  cluster.on('error', (err) => console.log('Redis Cluster Error', err));
+#### `.disconnect()`
 
-  await cluster.connect();
+Forcibly close a client's connection to Redis immediately. Calling `disconnect` will not send further pending commands to the Redis server, or wait for or parse outstanding responses.
 
-  await cluster.set('key', 'value');
-  const value = await cluster.get('key');
-})();
+```typescript
+await client.disconnect();
 ```
 
 ### Auto-Pipelining
@@ -273,6 +275,23 @@ await Promise.all([
 ]);
 ```
 
+### Clustering
+
+Check out the [Clustering Guide](./docs/clustering.md) when using Node Redis to connect to a Redis Cluster.
+
+## Supported Redis versions
+
+Node Redis is supported with the following versions of Redis:
+
+| Version | Supported          |
+|---------|--------------------|
+| 6.2.z   | :heavy_check_mark: |
+| 6.0.z   | :heavy_check_mark: |
+| 5.y.z   | :heavy_check_mark: |
+| < 5.0   | :x:                |
+
+> Node Redis should work with older versions of Redis, but it is not fully tested and we cannot offer support.
+
 ## Contributing
 
 If you'd like to contribute, check out the [contributing guide](CONTRIBUTING.md).

SECURITY.md

@@ -5,9 +5,9 @@
 Node Redis is generally backwards compatible with very few exceptions, so we recommend users to always use the latest version to experience stability, performance and security.
 
 | Version | Supported          |
-| ------- | ------------------ |
-| 4.0.x   | :white_check_mark: |
-| 3.1.x   | :white_check_mark: |
+|---------|--------------------|
+| 4.0.z   | :heavy_check_mark: |
+| 3.1.z   | :heavy_check_mark: |
 | < 3.1   | :x:                |
 
 ## Reporting a Vulnerability

docs/clustering.md

@@ -0,0 +1,54 @@
+# Clustering
+
+## Basic Example
+
+Connecting to a cluster is a bit different. Create the client by specifying some (or all) of the nodes in your cluster and then use it like a regular client instance:
+
+```typescript
+import { createCluster } from 'redis';
+
+(async () => {
+  const cluster = createCluster({
+    rootNodes: [
+      {
+        url: 'redis://10.0.0.1:30001'
+      },
+      {
+        url: 'redis://10.0.0.2:30002'
+      }
+    ]
+  });
+
+  cluster.on('error', (err) => console.log('Redis Cluster Error', err));
+
+  await cluster.connect();
+
+  await cluster.set('key', 'value');
+  const value = await cluster.get('key');
+})();
+```
+
+## `createCluster` configuration
+
+> See the [client configuration](./client-configuration.md) page for the `rootNodes` and `defaults` configuration schemas.
+
+| Property               | Default | Description                                                                                                                                                                                                                                                                                                         |
+|------------------------|---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| rootNodes              |         | An array of root nodes that are part of the cluster, which will be used to get the cluster topology. Each element in the array is a client configuration object. There is no need to specify every node in the cluster, 3 should be enough to reliably connect and obtain the cluster configuration from the server |
+| defaults               |         | The default configuration values for every client in the cluster.  Use this for example when specifying an ACL user to connect with                                                                                                                                                                                 |
+| useReplicas            | `false` | When `true`, distribute load by executing readonly commands (such as `GET`, `GEOSEARCH`, etc.) across all cluster nodes. When `false`, only use master nodes                                                                                                                                                        |
+| maxCommandRedirections | `16`    | The maximum number of times a command will be redirected due to `MOVED` or `ASK` errors                                                                                                                                                                                                                             |                                                                                                |
+
+## Command Routing
+
+### Commands that operate on Redis Keys
+
+Commands such as `GET`, `SET`, etc. will be routed by the first key, for instance `MGET 1 2 3` will be routed by the key `1`.
+
+### [Server Commands][https://redis.io/commands#server]
+
+Admin commands such as `MEMORY STATS`, `FLUSHALL`, etc. are not attached to the cluster, and should be executed on a specific node using `.getSlot()` or `.getAllMasters()`.
+
+### "Forwarded Commands"
+
+Some commands (e.g. `PUBLISH`) are forwarded to other cluster nodes by the Redis server. The client will send these commands to a random node in order to spread the load across the cluster.

lib/client/commands-queue.ts

@@ -6,20 +6,20 @@ import { RedisCommandRawReply } from '../commands';
 export interface QueueCommandOptions {
     asap?: boolean;
     chainId?: symbol;
-    signal?: any; // TODO: `AbortSignal` type is incorrect
+    signal?: AbortSignal;
 }
 
 interface CommandWaitingToBeSent extends CommandWaitingForReply {
     args: Array<string | Buffer>;
     chainId?: symbol;
     abort?: {
-        signal: any; // TODO: `AbortSignal` type is incorrect
+        signal: AbortSignal;
         listener(): void;
     };
 }
 
 interface CommandWaitingForReply {
-    resolve(reply?: any): void;
+    resolve(reply?: unknown): void;
     reject(err: Error): void;
     channelsCounter?: number;
     bufferMode?: boolean;
@@ -135,7 +135,8 @@ export default class RedisCommandsQueue {
                     signal: options.signal,
                     listener
                 };
-                options.signal.addEventListener('abort', listener, {
+                // AbortSignal type is incorrent
+                (options.signal as any).addEventListener('abort', listener, {
                     once: true
                 });
             }

lib/client/commands.ts

@@ -229,5 +229,5 @@ export default {
     UNWATCH,
     unwatch: UNWATCH,
     WAIT,
-    wait: WAIT,
+    wait: WAIT
 };

lib/client/index.spec.ts

@@ -611,8 +611,9 @@ describe('Client', () => {
             const promise = assert.rejects(client.connect(), ConnectionTimeoutError),
                 start = process.hrtime.bigint();
 
+            while (process.hrtime.bigint() - start < 1_000_000) {
                 // block the event loop for 1ms, to make sure the connection will timeout
-            while (process.hrtime.bigint() - start < 1_000_000) {}
+            }
 
             await promise;
         } catch (err) {

lib/client/index.ts

@@ -34,16 +34,16 @@ type WithCommands = {
 };
 
 export type WithModules<M extends RedisModules> = {
-    [P in keyof M]: {
+    [P in keyof M as M[P] extends never ? never : P]: {
         [C in keyof M[P]]: RedisClientCommandSignature<M[P][C]>;
     };
 };
 
 export type WithScripts<S extends RedisScripts> = {
-    [P in keyof S]: RedisClientCommandSignature<S[P]>;
+    [P in keyof S as S[P] extends never ? never : P]: RedisClientCommandSignature<S[P]>;
 };
 
-export type RedisClientType<M extends RedisModules = {}, S extends RedisScripts = {}> =
+export type RedisClientType<M extends RedisModules = Record<string, never>, S extends RedisScripts = Record<string, never>> =
     RedisClient<M, S> & WithCommands & WithModules<M> & WithScripts<S>;
 
 export type InstantiableRedisClient<M extends RedisModules, S extends RedisScripts> =
@@ -53,12 +53,14 @@ export interface ClientCommandOptions extends QueueCommandOptions {
     isolated?: boolean;
 }
 
+type ClientLegacyCallback = (err: Error | null, reply?: RedisCommandRawReply) => void;
+
 export default class RedisClient<M extends RedisModules, S extends RedisScripts> extends EventEmitter {
     static commandOptions(options: ClientCommandOptions): CommandOptions<ClientCommandOptions> {
         return commandOptions(options);
     }
 
-    static extend<M extends RedisModules = {}, S extends RedisScripts = {}>(plugins?: RedisPlugins<M, S>): InstantiableRedisClient<M, S> {
+    static extend<M extends RedisModules = Record<string, never>, S extends RedisScripts = Record<string, never>>(plugins?: RedisPlugins<M, S>): InstantiableRedisClient<M, S> {
         const Client = <any>extendWithModulesAndScripts({
             BaseClass: RedisClient,
             modules: plugins?.modules,
@@ -74,14 +76,14 @@ export default class RedisClient<M extends RedisModules, S extends RedisScripts>
         return Client;
     }
 
-    static create<M extends RedisModules = {}, S extends RedisScripts = {}>(options?: RedisClientOptions<M, S>): RedisClientType<M, S> {
+    static create<M extends RedisModules = Record<string, never>, S extends RedisScripts = Record<string, never>>(options?: RedisClientOptions<M, S>): RedisClientType<M, S> {
         return new (RedisClient.extend(options))(options);
     }
 
-    static parseURL(url: string): RedisClientOptions<{}, {}> {
+    static parseURL(url: string): RedisClientOptions<Record<string, never>, Record<string, never>> {
         // https://www.iana.org/assignments/uri-schemes/prov/redis
         const { hostname, port, protocol, username, password, pathname } = new URL(url),
-            parsed: RedisClientOptions<{}, {}> = {
+            parsed: RedisClientOptions<Record<string, never>, Record<string, never>> = {
                 socket: {
                     host: hostname
                 }
@@ -245,10 +247,12 @@ export default class RedisClient<M extends RedisModules, S extends RedisScripts>
 
         (this as any).#v4.sendCommand = this.#sendCommand.bind(this);
         (this as any).sendCommand = (...args: Array<unknown>): void => {
-            const callback = typeof args[args.length - 1] === 'function' ? args[args.length - 1] as Function : undefined,
+            const callback = typeof args[args.length - 1] === 'function' ?
+                    args[args.length - 1] as ClientLegacyCallback :
+                    undefined,
                 actualArgs = !callback ? args : args.slice(0, -1);
             this.#sendCommand(actualArgs.flat() as Array<string>)
-                .then((reply: unknown) => {
+                .then((reply: RedisCommandRawReply) => {
                     if (!callback) return;
 
                     // https://github.com/NodeRedis/node-redis#commands:~:text=minimal%20parsing
@@ -435,17 +439,12 @@ export default class RedisClient<M extends RedisModules, S extends RedisScripts>
 
         this.#socket.cork();
 
-        while (true) {
+        while (!this.#socket.writableNeedDrain) {
             const args = this.#queue.getCommandToSend();
             if (args === undefined) break;
 
-            let writeResult;
             for (const toWrite of encodeCommand(args)) {
-                writeResult = this.#socket.write(toWrite);
-            }
-
-            if (!writeResult) {
-                break;
+                this.#socket.write(toWrite);
             }
         }
     }

lib/client/multi-command.ts

@@ -11,16 +11,16 @@ type WithCommands<M extends RedisModules, S extends RedisScripts> = {
 };
 
 type WithModules<M extends RedisModules, S extends RedisScripts> = {
-    [P in keyof M]: {
+    [P in keyof M as M[P] extends never ? never : P]: {
         [C in keyof M[P]]: RedisClientMultiCommandSignature<M[P][C], M, S>;
     };
 };
 
 type WithScripts<M extends RedisModules, S extends RedisScripts> = {
-    [P in keyof S]: RedisClientMultiCommandSignature<S[P], M, S>
+    [P in keyof S as S[P] extends never ? never : P]: RedisClientMultiCommandSignature<S[P], M, S>
 };
 
-export type RedisClientMultiCommandType<M extends RedisModules = {}, S extends RedisScripts = {}> =
+export type RedisClientMultiCommandType<M extends RedisModules = Record<string, never>, S extends RedisScripts = Record<string, never>> =
     RedisClientMultiCommand & WithCommands<M, S> & WithModules<M, S> & WithScripts<M, S>;
 
 export type RedisClientMultiExecutor = (queue: Array<RedisMultiQueuedCommand>, chainId?: symbol) => Promise<Array<RedisCommandRawReply>>;

lib/client/socket.ts

@@ -234,7 +234,6 @@ export default class RedisSocket extends EventEmitter {
 
         this.#isOpen = false;
 
-
         try {
             await fn();
             await this.disconnect(true);

lib/cluster/index.ts

@@ -1,5 +1,5 @@
 import COMMANDS from './commands';
-import { RedisCommand, RedisCommandArguments, RedisCommandReply, RedisModules, RedisScript, RedisScripts } from '../commands';
+import { RedisCommand, RedisCommandArguments, RedisCommandReply, RedisModules, RedisPlugins, RedisScript, RedisScripts } from '../commands';
 import { ClientCommandOptions, RedisClientCommandSignature, RedisClientOptions, RedisClientType, WithModules, WithScripts } from '../client';
 import RedisClusterSlots, { ClusterNode } from './cluster-slots';
 import { extendWithModulesAndScripts, transformCommandArguments, transformCommandReply, extendWithCommands } from '../commander';
@@ -7,14 +7,9 @@ import { EventEmitter } from 'events';
 import RedisClusterMultiCommand, { RedisClusterMultiCommandType } from './multi-command';
 import { RedisMultiQueuedCommand } from '../multi-command';
 
-export type RedisClusterClientOptions = Omit<RedisClientOptions<{}, {}>, 'modules' | 'scripts'>;
+export type RedisClusterClientOptions = Omit<RedisClientOptions<Record<string, never>, Record<string, never>>, 'modules' | 'scripts'>;
 
-export interface RedisClusterPlugins<M extends RedisModules, S extends RedisScripts> {
-    modules?: M;
-    scripts?: S;
-}
-
-export interface RedisClusterOptions<M extends RedisModules, S extends RedisScripts> extends RedisClusterPlugins<M, S> {
+export interface RedisClusterOptions<M extends RedisModules, S extends RedisScripts> extends RedisPlugins<M, S> {
     rootNodes: Array<RedisClusterClientOptions>;
     defaults?: Partial<RedisClusterClientOptions>;
     useReplicas?: boolean;
@@ -25,10 +20,10 @@ type WithCommands = {
     [P in keyof typeof COMMANDS]: RedisClientCommandSignature<(typeof COMMANDS)[P]>;
 };
 
-export type RedisClusterType<M extends RedisModules = {}, S extends RedisScripts = {}> =
+export type RedisClusterType<M extends RedisModules = Record<string, never>, S extends RedisScripts = Record<string, never>> =
     RedisCluster<M, S> & WithCommands & WithModules<M> & WithScripts<S>;
 
-export default class RedisCluster<M extends RedisModules = {}, S extends RedisScripts = {}> extends EventEmitter {
+export default class RedisCluster<M extends RedisModules = Record<string, never>, S extends RedisScripts = Record<string, never>> extends EventEmitter {
     static extractFirstKey(command: RedisCommand, originalArgs: Array<unknown>, redisArgs: RedisCommandArguments): string | Buffer | undefined {
         if (command.FIRST_KEY_INDEX === undefined) {
             return undefined;
@@ -39,7 +34,7 @@ export default class RedisCluster<M extends RedisModules = {}, S extends RedisSc
         return command.FIRST_KEY_INDEX(...originalArgs);
     }
 
-    static create<M extends RedisModules = {}, S extends RedisScripts = {}>(options?: RedisClusterOptions<M, S>): RedisClusterType<M, S> {
+    static create<M extends RedisModules = Record<string, never>, S extends RedisScripts = Record<string, never>>(options?: RedisClusterOptions<M, S>): RedisClusterType<M, S> {
         return new (<any>extendWithModulesAndScripts({
             BaseClass: RedisCluster,
             modules: options?.modules,

lib/cluster/multi-command.ts

@@ -12,16 +12,16 @@ type WithCommands<M extends RedisModules, S extends RedisScripts> = {
 };
 
 type WithModules<M extends RedisModules, S extends RedisScripts> = {
-    [P in keyof M]: {
+    [P in keyof M as M[P] extends never ? never : P]: {
         [C in keyof M[P]]: RedisClusterMultiCommandSignature<M[P][C], M, S>;
     };
 };
 
 type WithScripts<M extends RedisModules, S extends RedisScripts> = {
-    [P in keyof S]: RedisClusterMultiCommandSignature<S[P], M, S>
+    [P in keyof S as S[P] extends never ? never : P]: RedisClusterMultiCommandSignature<S[P], M, S>
 };
 
-export type RedisClusterMultiCommandType<M extends RedisModules = {}, S extends RedisScripts = {}> =
+export type RedisClusterMultiCommandType<M extends RedisModules = Record<string, never>, S extends RedisScripts = Record<string, never>> =
     RedisClusterMultiCommand & WithCommands<M, S> & WithModules<M, S> & WithScripts<M, S>;
 
 export type RedisClusterMultiExecutor = (queue: Array<RedisMultiQueuedCommand>, firstKey?: string | Buffer, chainId?: symbol) => Promise<Array<RedisCommandRawReply>>;

lib/commands/COMMAND_COUNT.ts

@@ -6,4 +6,4 @@ export function transformArguments(): RedisCommandArguments {
     return ['COMMAND', 'COUNT'];
 }
 
-declare function transformReply(): number;
+export declare function transformReply(): number;

lib/commands/COMMAND_GETKEYS.ts

@@ -6,4 +6,4 @@ export function transformArguments(args: Array<string>): RedisCommandArguments {
     return ['COMMAND', 'GETKEYS', ...args];
 }
 
-declare function transformReply(): Array<string>;
+export declare function transformReply(): Array<string>;

lib/commands/SET.ts

@@ -2,43 +2,27 @@ import { RedisCommandArguments } from '.';
 
 export const FIRST_KEY_INDEX = 1;
 
-interface EX {
+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;
+
+type SetTTL = MaximumOneOf<{
     EX: number;
-}
-
-interface PX {
-    PX: number
-}
-
-interface EXAT {
+    PX: number;
     EXAT: number;
-}
-
-interface PXAT {
     PXAT: number;
-}
-
-interface KEEPTTL {
     KEEPTTL: true;
-}
+}>;
 
-type SetTTL = EX | PX | EXAT | PXAT | KEEPTTL | {};
-
-interface NX {
+type SetGuards = MaximumOneOf<{
     NX: true;
-}
-
-interface XX {
     XX: true;
-}
-
-type SetGuards = NX | XX | {};
+}>;
 
 interface SetCommonOptions {
-    GET: true
+    GET?: true;
 }
 
-type SetOptions = SetTTL & SetGuards & (SetCommonOptions | {});
+type SetOptions = SetTTL & SetGuards & SetCommonOptions;
 
 export function transformArguments(key: string | Buffer, value: string | Buffer, options?: SetOptions): RedisCommandArguments {
     const args = ['SET', key, value];
@@ -47,25 +31,25 @@ export function transformArguments(key: string | Buffer, value: string | Buffer,
         return args;
     }
 
-    if ('EX' in options) {
+    if (options.EX) {
         args.push('EX', options.EX.toString());
-    } else if ('PX' in options) {
+    } else if (options.PX) {
         args.push('PX', options.PX.toString());
-    } else if ('EXAT' in options) {
+    } else if (options.EXAT) {
         args.push('EXAT', options.EXAT.toString());
-    } else if ('PXAT' in options) {
+    } else if (options.PXAT) {
         args.push('PXAT', options.PXAT.toString());
-    } else if ((<KEEPTTL>options).KEEPTTL) {
+    } else if (options.KEEPTTL) {
         args.push('KEEPTTL');
     }
 
-    if ((<NX>options).NX) {
+    if (options.NX) {
         args.push('NX');
-    } else if ((<XX>options).XX) {
+    } else if (options.XX) {
         args.push('XX');
     }
 
-    if ((<SetCommonOptions>options).GET) {
+    if (options.GET) {
         args.push('GET');
     }
 

package.json

@@ -14,6 +14,7 @@
   "scripts": {
     "test": "nyc -r text-summary -r html mocha -r source-map-support/register -r ts-node/register './lib/**/*.spec.ts'",
     "build": "tsc",
+    "lint": "eslint ./*.ts ./lib/**/*.ts",
     "documentation": "typedoc"
   },
   "dependencies": {
@@ -26,20 +27,23 @@
     "@istanbuljs/nyc-config-typescript": "^1.0.1",
     "@tsconfig/node12": "^1.0.9",
     "@types/mocha": "^9.0.0",
-    "@types/node": "^16.10.3",
+    "@types/node": "^16.11.1",
     "@types/sinon": "^10.0.4",
     "@types/which": "^2.0.1",
     "@types/yallist": "^4.0.1",
-    "mocha": "^9.1.2",
+    "@typescript-eslint/eslint-plugin": "^5.1.0",
+    "@typescript-eslint/parser": "^5.1.0",
+    "eslint": "^8.0.1",
+    "mocha": "^9.1.3",
     "nyc": "^15.1.0",
     "release-it": "^14.11.6",
     "sinon": "^11.1.2",
     "source-map-support": "^0.5.20",
     "ts-node": "^10.3.0",
-    "typedoc": "^0.22.5",
+    "typedoc": "^0.22.6",
     "typedoc-github-wiki-theme": "^0.6.0",
     "typedoc-plugin-markdown": "^3.11.3",
-    "typescript": "^4.4.3",
+    "typescript": "^4.4.4",
     "which": "^2.0.2"
   },
   "engines": {