enhance the way commanders (client/multi/cluster) get extended with modules and scripts

lib/client.spec.ts

@@ -6,6 +6,17 @@ import { AbortError } from './errors';
 import { defineScript } from './lua-script';
 import { spy } from 'sinon';
 
+const SQUARE_SCRIPT = defineScript({
+    NUMBER_OF_KEYS: 0,
+    SCRIPT: 'return ARGV[1] * ARGV[1];',
+    transformArguments(number: number): Array<string> {
+        return [number.toString()];
+    },
+    transformReply(reply: number): number {
+        return reply;
+    }
+});
+
 describe('Client', () => {
     describe('authentication', () => {
         itWithClient(TestRedisServers.PASSWORD, 'Client should be authenticated', async client => {
@@ -26,7 +37,6 @@ describe('Client', () => {
             await assert.rejects(
                 client.connect(),
                 {
-                    
                     message: isRedisVersionGreaterThan([6]) ?
                         'WRONGPASS invalid username-password pair or user is disabled.' :
                         'ERR invalid password'
@@ -40,17 +50,8 @@ describe('Client', () => {
     describe('legacyMode', () => {
         const client = RedisClient.create({
             socket: TEST_REDIS_SERVERS[TestRedisServers.OPEN],
-            modules: {
-                testModule: {
-                    echo: {
-                        transformArguments(message: string): Array<string> {
-                            return ['ECHO', message];
-                        },
-                        transformReply(reply: string): string {
-                            return reply;
-                        }
-                    }
-                }
+            scripts: {
+                square: SQUARE_SCRIPT
             },
             legacyMode: true
         });
@@ -165,54 +166,8 @@ describe('Client', () => {
             );
         });
 
-        it('client.testModule.echo should call the callback', done => {
-            (client as any).testModule.echo('message', (err?: Error, reply?: string) => {
-                if (err) {
-                    return done(err);
-                }
-
-                try {
-                    assert.deepEqual(reply, 'message');
-                    done();
-                } catch (err) {
-                    done(err);
-                }
-            });
-        });
-
-        it('client.v4.testModule.echo should return a promise', async () => {
-            assert.equal(
-                await (client as any).v4.testModule.echo('message'),
-                'message'
-            );
-        });
-        
-        it('client.multi.testModule.echo.v4.testModule.echo.exec should call the callback', done => {
-            (client as any).multi()
-                .testModule.echo('message')
-                .v4.testModule.echo('message')
-                .exec((err?: Error, replies?: Array<string>) => {
-                    if (err) {
-                        return done(err);
-                    }
-
-                    try {
-                        assert.deepEqual(replies, ['message', 'message']);
-                        done();
-                    } catch (err) {
-                        done(err);
-                    }
-                });
-        });
-
-        it('client.multi.testModule.echo.v4.testModule.echo.v4.exec should return a promise', async () => {
-            assert.deepEqual(
-                await ((client as any).multi()
-                    .testModule.echo('message')
-                    .v4.testModule.echo('message')
-                    .v4.exec()),
-                ['message', 'message']
-            );
+        it('client.{script} should return a promise', async () => {
+            assert.equal(await client.square(2), 4);
         });
     });
 
@@ -296,18 +251,7 @@ describe('Client', () => {
         it('with script', async () => {
             const client = RedisClient.create({
                 scripts: {
-                    add: defineScript({
-                        NUMBER_OF_KEYS: 0,
-                        SCRIPT: 'return ARGV[1] + 1;',
-                        transformArguments(number: number): Array<string> {
-                            assert.equal(number, 1);
-                            return [number.toString()];
-                        },
-                        transformReply(reply: number): number {
-                            assert.equal(reply, 2);
-                            return reply;
-                        }
-                    })
+                    square: SQUARE_SCRIPT
                 }
             });
 
@@ -316,9 +260,9 @@ describe('Client', () => {
             try {
                 assert.deepEqual(
                     await client.multi()
-                        .add(1)
+                        .square(2)
                         .exec(),
-                    [2]
+                    [4]
                 );
             } finally {
                 await client.disconnect();
@@ -329,18 +273,7 @@ describe('Client', () => {
     it('scripts', async () => {
         const client = RedisClient.create({
             scripts: {
-                add: defineScript({
-                    NUMBER_OF_KEYS: 0,
-                    SCRIPT: 'return ARGV[1] + 1;',
-                    transformArguments(number: number): Array<string> {
-                        assert.equal(number, 1);
-                        return [number.toString()];
-                    },
-                    transformReply(reply: number): number {
-                        assert.equal(reply, 2);
-                        return reply;
-                    }
-                })
+                square: SQUARE_SCRIPT
             }
         });
 
@@ -348,8 +281,8 @@ describe('Client', () => {
 
         try {
             assert.equal(
-                await client.add(1),
-                2
+                await client.square(2),
+                4
             );
         } finally {
             await client.disconnect();

lib/client.ts

@@ -9,6 +9,7 @@ import { RedisLuaScript, RedisLuaScripts } from './lua-script';
 import { ScanOptions, ZMember } from './commands/generic-transformers';
 import { ScanCommandOptions } from './commands/SCAN';
 import { HScanTuple } from './commands/HSCAN';
+import { extendWithDefaultCommands, extendWithModulesAndScripts, transformCommandArguments } from './commander';
 
 export interface RedisClientOptions<M = RedisModules, S = RedisLuaScripts> {
     socket?: RedisSocketOptions;
@@ -47,18 +48,54 @@ export interface ClientCommandOptions extends QueueCommandOptions {
 }
 
 export default class RedisClient<M extends RedisModules = RedisModules, S extends RedisLuaScripts = RedisLuaScripts> extends EventEmitter {
-    static create<M extends RedisModules, S extends RedisLuaScripts>(options?: RedisClientOptions<M, S>): RedisClientType<M, S> {
-        return <any>new RedisClient<M, S>(options);
-    }
-
     static commandOptions(options: ClientCommandOptions): CommandOptions<ClientCommandOptions> {
         return commandOptions(options);
     }
 
+    static async commandsExecutor(
+        this: RedisClient,
+        command: RedisCommand,
+        args: Array<unknown>
+    ): Promise<ReturnType<typeof command['transformReply']>> {
+        const { args: redisArgs, options } = transformCommandArguments<ClientCommandOptions>(command, args);
+
+        const reply = command.transformReply(
+            await this.#sendCommand(redisArgs, options),
+            redisArgs.preserve
+        );
+
+        return reply;
+    }
+
+    static async #scriptsExecutor(
+        this: RedisClient,
+        script: RedisLuaScript,
+        args: Array<unknown>
+    ): Promise<typeof script['transformArguments']> {
+        const { args: redisArgs, options } = transformCommandArguments<ClientCommandOptions>(script, args);
+
+        const reply = script.transformReply(
+            await this.executeScript(script, redisArgs, options),
+            redisArgs.preserve
+        );
+
+        return reply;
+    }
+
+    static create<M extends RedisModules, S extends RedisLuaScripts>(options?: RedisClientOptions<M, S>): RedisClientType<M, S> {
+        return new (<any>extendWithModulesAndScripts({
+            BaseClass: RedisClient,
+            modules: options?.modules,
+            modulesCommandsExecutor: RedisClient.commandsExecutor,
+            scripts: options?.scripts,
+            scriptsExecutor: RedisClient.#scriptsExecutor
+        }))(options);
+    }
+
     readonly #options?: RedisClientOptions<M, S>;
     readonly #socket: RedisSocket;
     readonly #queue: RedisCommandsQueue;
-    readonly #Multi: typeof RedisMultiCommand & { new(): RedisMultiCommandType<M, S> };
+    readonly #Multi: new (...args: ConstructorParameters<typeof RedisMultiCommand>) => RedisMultiCommandType<M, S>;
     readonly #v4: Record<string, any> = {};
     #selectedDB = 0;
 
@@ -83,9 +120,7 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
         this.#options = options;
         this.#socket = this.#initiateSocket();
         this.#queue = this.#initiateQueue();
-        this.#Multi = this.#initiateMulti();
-        this.#initiateModules();
-        this.#initiateScripts();
+        this.#Multi = RedisMultiCommand.extend(options);
         this.#legacyMode();
     }
 
@@ -137,98 +172,14 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
         );
     }
 
-    #initiateMulti(): typeof RedisMultiCommand & { new(): RedisMultiCommandType<M, S> } {
-        const executor = async (commands: Array<MultiQueuedCommand>): Promise<Array<RedisReply>> => {
-            const promise = Promise.all(
-                commands.map(({encodedCommand}) => {
-                    return this.#queue.addEncodedCommand(encodedCommand);
-                })
-            );
-
-            this.#tick();
-
-            return await promise;
-        };
-
-        const options = this.#options;
-        return <any>class extends RedisMultiCommand {
-            constructor() {
-                super(executor, options);
-            }
-        };
-    }
-
-    #initiateModules(): void {
-        if (!this.#options?.modules) return;
-
-        for (const [moduleName, commands] of Object.entries(this.#options.modules)) {
-            const module: {
-                [P in keyof typeof commands]: RedisCommandSignature<(typeof commands)[P]>;
-            } = {};
-
-            for (const [commandName, command] of Object.entries(commands)) {
-                module[commandName] = (...args) => this.executeCommand(command, args);
-            }
-
-            (this as any)[moduleName] = module;
-        }
-    }
-
-    #initiateScripts(): void {
-        if (!this.#options?.scripts) return;
-
-        for (const [name, script] of Object.entries(this.#options.scripts)) {
-            (this as any)[name] = async function (...args: Parameters<typeof script.transformArguments>): Promise<ReturnType<typeof script.transformReply>> {
-                let options;
-                if (isCommandOptions<ClientCommandOptions>(args[0])) {
-                    options = args[0];
-                    args = args.slice(1);
-                }
-
-                const transformedArguments = script.transformArguments(...args);
-                return script.transformReply(
-                    await this.executeScript(
-                        script,
-                        transformedArguments,
-                        options
-                    ),
-                    transformedArguments.preserve
-                );
-            };
-        }
-    }
-
-    async executeScript<S extends RedisLuaScript>(script: S, args: Array<string>, options?: ClientCommandOptions): Promise<ReturnType<S['transformReply']>> {
-        try {
-            return await this.#sendCommand([
-                'EVALSHA',
-                script.SHA,
-                script.NUMBER_OF_KEYS.toString(),
-                ...args
-            ], options);
-        } catch (err: any) {
-            if (!err?.message?.startsWith?.('NOSCRIPT')) {
-                throw err;
-            }
-
-            return await this.#sendCommand([
-                'EVAL',
-                script.SCRIPT,
-                script.NUMBER_OF_KEYS.toString(),
-                ...args
-            ], options);
-        }
-    }
-
     #legacyMode(): void {
         if (!this.#options?.legacyMode) return;
 
-        (this as any).#v4.sendCommand = this.sendCommand.bind(this);
+        (this as any).#v4.sendCommand = this.#sendCommand.bind(this);
         (this as any).sendCommand = (...args: Array<unknown>): void => {
-            const options = isCommandOptions<ClientCommandOptions>(args[0]) ? args[0] : undefined,
-                callback = typeof args[args.length - 1] === 'function' ? args[args.length - 1] as Function : undefined,
-                actualArgs = !options && !callback ? args : args.slice(options ? 1 : 0, callback ? -1 : Infinity);
-            this.#sendCommand(actualArgs.flat() as Array<string>, options)
+            const callback = typeof args[args.length - 1] === 'function' ? args[args.length - 1] as Function : undefined,
+                actualArgs = !callback ? args : args.slice(0, -1);
+            this.#sendCommand(actualArgs.flat() as Array<string>)
                 .then((reply: unknown) => {
                     if (!callback) return;
 
@@ -244,7 +195,7 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
 
                     callback(err);
                 });
-        }
+        };
 
         for (const name of Object.keys(COMMANDS)) {
             this.#defineLegacyCommand(name);
@@ -261,39 +212,17 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
         this.#defineLegacyCommand('unsubscribe');
         this.#defineLegacyCommand('PUNSUBSCRIBE');
         this.#defineLegacyCommand('pUnsubscribe');
-
-        if (this.#options?.modules) {
-            for (const [module, commands] of Object.entries(this.#options.modules)) {
-                for (const name of Object.keys(commands)) {
-                    this.#v4[module] = {};
-                    this.#defineLegacyCommand(name, module);
-                }
-            }
-        }
-
-        if (this.#options?.scripts) {
-            for (const name of Object.keys(this.#options.scripts)) {
-                this.#defineLegacyCommand(name);
-            }
-        }
     }
 
-    #defineLegacyCommand(name: string, moduleName?: string): void {
-        const handler = (...args: Array<unknown>): void => {
+    #defineLegacyCommand(name: string): void {
+        (this as any).#v4[name] = (this as any)[name].bind(this);
+        (this as any)[name] = (...args: Array<unknown>): void => {
             (this as any).sendCommand(name, ...args);
         };
-
-        if (moduleName) {
-            (this as any).#v4[moduleName][name] = (this as any)[moduleName][name];
-            (this as any)[moduleName][name] = handler;
-        } else {
-            (this as any).#v4[name] = (this as any)[name].bind(this);
-            (this as any)[name] = handler;
-        }
     }
 
     duplicate(): RedisClientType<M, S> {
-        return RedisClient.create(this.#options);
+        return new (Object.getPrototypeOf(this).constructor)(this.#options);
     }
 
     async connect(): Promise<void> {
@@ -354,13 +283,14 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
         return this.#sendCommand(args, options);
     }
 
+    // using `#sendCommand` cause `sendCommand` is overwritten in legacy mode
     async #sendCommand<T = unknown>(args: Array<string>, options?: ClientCommandOptions): Promise<T> {
         if (options?.duplicateConnection) {
             const duplicate = this.duplicate();
             await duplicate.connect();
 
             try {
-                return await duplicate.#sendCommand(args, {
+                return await duplicate.sendCommand(args, {
                     ...options,
                     duplicateConnection: false
                 });
@@ -374,25 +304,45 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
         return await promise;
     }
 
-    async executeCommand(command: RedisCommand, args: Array<unknown>): Promise<unknown> {
-        let options;
-        if (isCommandOptions<ClientCommandOptions>(args[0])) {
-            options = args[0];
-            args = args.slice(1);
-        }
+    async executeScript(script: RedisLuaScript, args: Array<string>, options?: ClientCommandOptions): Promise<ReturnType<typeof script['transformReply']>> {
+        try {
+            return await this.#sendCommand([
+                'EVALSHA',
+                script.SHA,
+                script.NUMBER_OF_KEYS.toString(),
+                ...args
+            ], options);
+        } catch (err: any) {
+            if (!err?.message?.startsWith?.('NOSCRIPT')) {
+                throw err;
+            }
 
-        const transformedArguments = command.transformArguments(...args);
-        return command.transformReply(
-            await this.#sendCommand(
-                transformedArguments,
-                options
-            ),
-            transformedArguments.preserve
+            return await this.#sendCommand([
+                'EVAL',
+                script.SCRIPT,
+                script.NUMBER_OF_KEYS.toString(),
+                ...args
+            ], options);
+        }
+    }
+
+    async #multiExecutor(commands: Array<MultiQueuedCommand>): Promise<Array<RedisReply>> {
+        const promise = Promise.all(
+            commands.map(({encodedCommand}) => {
+                return this.#queue.addEncodedCommand(encodedCommand);
+            })
         );
+
+        this.#tick();
+
+        return await promise;
     }
 
     multi(): RedisMultiCommandType<M, S> {
-        return new this.#Multi();
+        return new this.#Multi(
+            this.#multiExecutor.bind(this),
+            this.#options
+        );
     }
 
     async* scanIterator(options?: ScanCommandOptions): AsyncIterable<string> {
@@ -470,8 +420,4 @@ export default class RedisClient<M extends RedisModules = RedisModules, S extend
     }
 }
 
-for (const [name, command] of Object.entries(COMMANDS)) {
-    (RedisClient.prototype as any)[name] = async function (this: RedisClient, ...args: Array<unknown>): Promise<unknown> {
-        return this.executeCommand(command, args);
-    };
-}
+extendWithDefaultCommands(RedisClient, RedisClient.commandsExecutor);

lib/cluster.ts

@@ -1,10 +1,10 @@
-import COMMANDS from './commands';
 import { RedisCommand, RedisModules } from './commands';
-import { ClientCommandOptions, RedisClientType, RedisCommandSignature, WithPlugins } from './client';
+import { ClientCommandOptions, RedisClientType, WithPlugins } from './client';
 import { RedisSocketOptions } from './socket';
 import RedisClusterSlots, { ClusterNode } from './cluster-slots';
 import { RedisLuaScript, RedisLuaScripts } from './lua-script';
-import { commandOptions, CommandOptions, isCommandOptions } from './command-options';
+import { commandOptions, CommandOptions } from './command-options';
+import { extendWithModulesAndScripts, extendWithDefaultCommands, transformCommandArguments } from './commander';
 
 export interface RedisClusterOptions<M = RedisModules, S = RedisLuaScripts> {
     rootNodes: Array<RedisSocketOptions>;
@@ -28,8 +28,54 @@ export default class RedisCluster<M extends RedisModules = RedisModules, S exten
         return commandOrScript.FIRST_KEY_INDEX(...originalArgs);
     }
 
-    static create<M extends RedisModules, S extends RedisLuaScripts>(options: RedisClusterOptions): RedisClusterType<M, S> {
-        return <any>new RedisCluster(options);
+    static async commandsExecutor(
+        this: RedisCluster,
+        command: RedisCommand,
+        args: Array<unknown>
+    ): Promise<ReturnType<typeof command['transformReply']>> {
+        const { args: redisArgs, options } = transformCommandArguments<ClientCommandOptions>(command, args);
+
+        const reply = command.transformReply(
+            await this.sendCommand(
+                RedisCluster.#extractFirstKey(command, args, redisArgs),
+                command.IS_READ_ONLY,
+                redisArgs,
+                options
+            ),
+            redisArgs.preserve
+        );
+
+        return reply;
+    }
+
+    static async #scriptsExecutor(
+        this: RedisCluster,
+        script: RedisLuaScript,
+        args: Array<unknown>
+    ): Promise<typeof script['transformArguments']> {
+        const { args: redisArgs, options } = transformCommandArguments<ClientCommandOptions>(script, args);
+
+        const reply = script.transformReply(
+            await this.executeScript(
+                script,
+                args,
+                redisArgs,
+                options
+            ),
+            redisArgs.preserve
+        );
+
+        return reply;
+    }
+
+    static create<M extends RedisModules, S extends RedisLuaScripts>(options?: RedisClusterOptions<M, S>): RedisClusterType<M, S> {
+        return new (<any>extendWithModulesAndScripts({
+            BaseClass: RedisCluster,
+            modules: options?.modules,
+            modulesCommandsExecutor: RedisCluster.commandsExecutor,
+            scripts: options?.scripts,
+            scriptsExecutor: RedisCluster.#scriptsExecutor
+        }))(options);
     }
 
     static commandOptions(options: ClientCommandOptions): CommandOptions<ClientCommandOptions> {
@@ -42,49 +88,6 @@ export default class RedisCluster<M extends RedisModules = RedisModules, S exten
     constructor(options: RedisClusterOptions<M, S>) {
         this.#options = options;
         this.#slots = new RedisClusterSlots(options);
-        this.#initiateModules();
-        this.#initiateScripts();
-    }
-
-    #initiateModules(): void {
-        if (!this.#options.modules) return;
-
-        for (const [moduleName, commands] of Object.entries(this.#options.modules)) {
-            const module: {
-                [P in keyof typeof commands]: RedisCommandSignature<(typeof commands)[P]>;
-            } = {};
-
-            for (const [commandName, command] of Object.entries(commands)) {
-                module[commandName] = (...args) => this.executeCommand(command, args);
-            }
-
-            (this as any)[moduleName] = module;
-        }
-    }
-
-    #initiateScripts(): void {
-        if (!this.#options.scripts) return;
-
-        for (const [name, script] of Object.entries(this.#options.scripts)) {
-            (this as any)[name] = async function (...args: Parameters<typeof script.transformArguments>): Promise<ReturnType<typeof script.transformReply>> {
-                let options;
-                if (isCommandOptions<ClientCommandOptions>(args[0])) {
-                    options = args[0];
-                    args = args.slice(1);
-                }
-
-                const transformedArguments = script.transformArguments(...args);
-                return script.transformReply(
-                    await this.executeScript(
-                        script,
-                        args,
-                        transformedArguments,
-                        options
-                    ),
-                    transformedArguments.preserve
-                );
-            };
-        }
     }
 
     async connect(): Promise<void> {
@@ -114,32 +117,13 @@ export default class RedisCluster<M extends RedisModules = RedisModules, S exten
         }
     }
 
-    async executeCommand(command: RedisCommand, args: Array<unknown>): Promise<(typeof command)['transformReply']> {
-        let options;
-        if (isCommandOptions<ClientCommandOptions>(args[0])) {
-            options = args[0];
-            args = args.slice(1);
-        }
-
-        const redisArgs = command.transformArguments(...args);
-        return command.transformReply(
-            await this.sendCommand(
-                RedisCluster.#extractFirstKey(command, args, redisArgs),
-                command.IS_READ_ONLY,
-                redisArgs,
-                options
-            ),
-            redisArgs.preserve
-        );
-    }
-
-    async executeScript<S extends RedisLuaScript>(
-        script: S,
+    async executeScript(
+        script: RedisLuaScript,
         originalArgs: Array<unknown>,
         redisArgs: Array<string>,
         options?: ClientCommandOptions,
         redirections = 0
-    ): Promise<ReturnType<S['transformReply']>> {
+    ): Promise<ReturnType<typeof script['transformReply']>> {
         const client = this.#slots.getClient(
             RedisCluster.#extractFirstKey(script, originalArgs, redisArgs),
             script.IS_READ_ONLY
@@ -199,8 +183,5 @@ export default class RedisCluster<M extends RedisModules = RedisModules, S exten
     }
 }
 
-for (const [name, command] of Object.entries(COMMANDS)) {
-    (RedisCluster.prototype as any)[name] = function (this: RedisCluster, ...args: Array<unknown>) {
-        return this.executeCommand(command, args);
-    };
-}
+extendWithDefaultCommands(RedisCluster, RedisCluster.commandsExecutor);
+

lib/commander.ts

@@ -0,0 +1,88 @@
+
+import COMMANDS, { RedisCommand, RedisModules, TransformArgumentsReply } from './commands';
+import { RedisLuaScript, RedisLuaScripts } from './lua-script';
+import { CommandOptions, isCommandOptions } from './command-options';
+
+type Instantiable<T = any> = new(...args: Array<any>) => T;
+
+type CommandExecutor<T extends Instantiable = Instantiable> = (this: InstanceType<T>, command: RedisCommand, args: Array<unknown>) => unknown;
+
+export function extendWithDefaultCommands<T extends Instantiable>(BaseClass: T, executor: CommandExecutor<T>): void {
+    for (const [name, command] of Object.entries(COMMANDS)) {
+        BaseClass.prototype[name] = function (...args: Array<unknown>): unknown {
+            return executor.call(this, command, args);
+        };
+    }
+}
+
+interface ExtendWithModulesAndScriptsConfig<
+    T extends Instantiable,
+    M extends RedisModules,
+    S extends RedisLuaScripts
+> {
+    BaseClass: T;
+    modules: M | undefined;
+    modulesCommandsExecutor: CommandExecutor<T>;
+    scripts: S | undefined;
+    scriptsExecutor(this: InstanceType<T>, script: RedisLuaScript, args: Array<unknown>): unknown;
+}
+
+export function extendWithModulesAndScripts<
+    T extends Instantiable,
+    M extends RedisModules,
+    S extends RedisLuaScripts,
+>(config: ExtendWithModulesAndScriptsConfig<T, M, S>): T {
+    let Commander: T | undefined,
+        modulesBaseObject: Record<string, any>;
+
+    if (config.modules) {
+        modulesBaseObject = Object.create(null);
+        Commander = class extends config.BaseClass {
+            constructor(...args: Array<any>) {
+                super(...args);
+                modulesBaseObject.self = this;
+            }
+        };
+
+        for (const [moduleName, module] of Object.entries(config.modules)) {
+            Commander.prototype[moduleName] = Object.create(modulesBaseObject);
+
+            for (const [commandName, command] of Object.entries(module)) {
+                Commander.prototype[moduleName][commandName] = function (...args: Array<unknown>): unknown {
+                    return config.modulesCommandsExecutor.call(this.self, command, args);
+                };
+            }
+        }
+    }
+
+    if (config.scripts) {
+        Commander ??= class extends config.BaseClass {};
+
+        for (const [name, script] of Object.entries(config.scripts)) {
+            Commander.prototype[name] = function (...args: Array<unknown>): unknown {
+                return config.scriptsExecutor.call(this, script, args);
+            };
+        }
+    }
+
+    return (Commander ?? config.BaseClass) as any;
+}
+
+export function transformCommandArguments<T = unknown>(
+    command: RedisCommand,
+    args: Array<unknown>
+): {
+    args: TransformArgumentsReply;
+    options: CommandOptions<T> | undefined;
+} {
+    let options;
+    if (isCommandOptions<T>(args[0])) {
+        options = args[0];
+        args = args.slice(1);
+    }
+
+    return {
+        args: command.transformArguments(...args),
+        options
+    };
+}

lib/multi-command.ts

@@ -1,8 +1,9 @@
 import COMMANDS, { TransformArgumentsReply } from './commands';
 import { RedisCommand, RedisModules, RedisReply } from './commands';
 import RedisCommandsQueue from './commands-queue';
-import { RedisLuaScripts } from './lua-script';
+import { RedisLuaScript, RedisLuaScripts } from './lua-script';
 import { RedisClientOptions } from './client';
+import { extendWithModulesAndScripts, extendWithDefaultCommands } from './commander';
 
 type RedisMultiCommandSignature<C extends RedisCommand, M extends RedisModules, S extends RedisLuaScripts> = (...args: Parameters<C['transformArguments']>) => RedisMultiCommandType<M, S>;
 
@@ -31,10 +32,62 @@ export interface MultiQueuedCommand {
 export type RedisMultiExecutor = (queue: Array<MultiQueuedCommand>, chainId?: symbol) => Promise<Array<RedisReply>>;
 
 export default class RedisMultiCommand<M extends RedisModules = RedisModules, S extends RedisLuaScripts = RedisLuaScripts> {
-    static create<M extends RedisModules, S extends RedisLuaScripts>(executor: RedisMultiExecutor, clientOptions?: RedisClientOptions<M, S>): RedisMultiCommandType<M, S> {
-        return <any>new RedisMultiCommand<M, S>(executor, clientOptions);
+    static commandsExecutor(this: RedisMultiCommand, command: RedisCommand, args: Array<unknown>): RedisMultiCommand {
+        return this.addCommand(
+            command.transformArguments(...args),
+            command.transformReply
+        );
     }
 
+    static #scriptsExecutor(
+        this: RedisMultiCommand,
+        script: RedisLuaScript,
+        args: Array<unknown>
+    ): RedisMultiCommand {
+        const transformedArguments: TransformArgumentsReply = [];
+        if (this.#scriptsInUse.has(script.SHA)) {
+            transformedArguments.push(
+                'EVALSHA',
+                script.SHA
+            );
+        } else {
+            this.#scriptsInUse.add(script.SHA);
+            transformedArguments.push(
+                'EVAL',
+                script.SCRIPT
+            );
+        }
+
+        transformedArguments.push(script.NUMBER_OF_KEYS.toString());
+
+        const scriptArguments = script.transformArguments(...args);
+        transformedArguments.push(...scriptArguments);
+        transformedArguments.preserve = scriptArguments.preserve;
+
+        return this.addCommand(
+            transformedArguments,
+            script.transformReply
+        );
+    }
+
+    static extend<M extends RedisModules, S extends RedisLuaScripts>(
+        clientOptions?: RedisClientOptions<M, S>
+    ): new (...args: ConstructorParameters<typeof RedisMultiCommand>) => RedisMultiCommandType<M, S> {
+        return <any>extendWithModulesAndScripts({
+            BaseClass: RedisMultiCommand,
+            modules: clientOptions?.modules,
+            modulesCommandsExecutor: RedisMultiCommand.commandsExecutor,
+            scripts: clientOptions?.scripts,
+            scriptsExecutor: RedisMultiCommand.#scriptsExecutor
+        });
+    }
+
+    static create<M extends RedisModules, S extends RedisLuaScripts>(
+        executor: RedisMultiExecutor,
+        clientOptions?: RedisClientOptions<M, S>
+    ): RedisMultiCommandType<M, S> {
+        return <any>new this(executor, clientOptions);
+    }
     readonly #executor: RedisMultiExecutor;
 
     readonly #clientOptions: RedisClientOptions<M, S> | undefined;
@@ -56,65 +109,20 @@ export default class RedisMultiCommand<M extends RedisModules = RedisModules, S
     constructor(executor: RedisMultiExecutor, clientOptions?: RedisClientOptions<M, S>) {
         this.#executor = executor;
         this.#clientOptions = clientOptions;
-        this.#initiateModules();
-        this.#initiateScripts();
         this.#legacyMode();
     }
 
-    #initiateModules(): void {
-        if (!this.#clientOptions?.modules) return;
-
-        for (const [moduleName, commands] of Object.entries(this.#clientOptions.modules)) {
-            const module: {
-                [P in keyof typeof commands]: RedisMultiCommandSignature<(typeof commands)[P], M, S>
-            } = {};
-
-            for (const [commandName, command] of Object.entries(commands)) {
-                module[commandName] = (...args) => this.executeCommand(command, args);
-            }
-
-            (this as any)[moduleName] = module;
-        }
-    }
-
-    #initiateScripts(): void {
-        if (!this.#clientOptions?.scripts) return;
-
-        for (const [name, script] of Object.entries(this.#clientOptions.scripts)) {
-            (this as any)[name] = function (...args: Array<unknown>) {
-                const transformedArgs: TransformArgumentsReply = [];
-                if (this.#scriptsInUse.has(name)) {
-                    transformedArgs.push(
-                        'EVALSHA',
-                        script.SHA
-                    );
-                } else {
-                    this.#scriptsInUse.add(name);
-                    transformedArgs.push(
-                        'EVAL',
-                        script.SCRIPT
-                    );
-                }
-
-                transformedArgs.push(script.NUMBER_OF_KEYS.toString());
-
-                const scriptArgs = script.transformArguments(...args);
-                transformedArgs.push(...scriptArgs);
-                transformedArgs.preserve = scriptArgs.preserve;
-
-                return this.addCommand(
-                    transformedArgs,
-                    script.transformReply
-                );
-            };
-        }
-    }
-
     #legacyMode(): void {
         if (!this.#clientOptions?.legacyMode) return;
 
+        this.#v4.addCommand = this.addCommand.bind(this);
+        (this as any).addCommand = (...args: Array<unknown>): this => {
+            this.#queue.push({
+                encodedCommand: RedisCommandsQueue.encodeCommand(args.flat() as Array<string>)
+            });
+            return this;
+        }
         this.#v4.exec = this.exec.bind(this);
-
         (this as any).exec = (callback?: (err: Error | null, replies?: Array<unknown>) => unknown): void => {
             this.#v4.exec()
                 .then((reply: Array<unknown>) => {
@@ -135,55 +143,21 @@ export default class RedisMultiCommand<M extends RedisModules = RedisModules, S
         for (const name of Object.keys(COMMANDS)) {
             this.#defineLegacyCommand(name);
         }
-
-        if (this.#clientOptions?.modules) {
-            for (const [module, commands] of Object.entries(this.#clientOptions.modules)) {
-                for (const name of Object.keys(commands)) {
-                    this.#v4[module] = {};
-                    this.#defineLegacyCommand(name, module);
-                }
-            }
-        }
-
-        if (this.#clientOptions.scripts) {
-            for (const name of Object.keys(this.#clientOptions.scripts)) {
-                this.#defineLegacyCommand(name);
-            }
-        }
     }
 
-    #defineLegacyCommand(name: string, moduleName?: string): void {
-        const handler = (...args: Array<unknown>): RedisMultiCommandType<M, S> => {
-            return this.addCommand([
-                name,
-                ...args.flat() as Array<string>
-            ]);
-        };
-
-        if (moduleName) {
-            this.#v4[moduleName][name] = (this as any)[moduleName][name];
-            (this as any)[moduleName][name] = handler;
-        } else {
-            this.#v4[name] = (this as any)[name].bind(this);
-            (this as any)[name] = handler;
-        }
+    #defineLegacyCommand(name: string): void {
+        (this as any).#v4[name] = (this as any)[name].bind(this.#v4);
+        (this as any)[name] = (...args: Array<unknown>): void => (this as any).addCommand(name, args);
     }
 
-    addCommand(args: TransformArgumentsReply, transformReply?: RedisCommand['transformReply']): RedisMultiCommandType<M, S> {
+    addCommand(args: TransformArgumentsReply, transformReply?: RedisCommand['transformReply']): this {
         this.#queue.push({
             encodedCommand: RedisCommandsQueue.encodeCommand(args),
             preservedArguments: args.preserve,
             transformReply
         });
 
-        return <any>this;
-    }
-
-    executeCommand(command: RedisCommand, args: Array<unknown>): RedisMultiCommandType<M, S> {
-        return this.addCommand(
-            command.transformArguments(...args),
-            command.transformReply
-        );
+        return this;
     }
 
     async exec(execAsPipeline = false): Promise<Array<unknown>> {
@@ -217,8 +191,4 @@ export default class RedisMultiCommand<M extends RedisModules = RedisModules, S
     }
 }
 
-for (const [name, command] of Object.entries(COMMANDS)) {
-    (RedisMultiCommand.prototype as any)[name] = function (...args: Array<unknown>): RedisMultiCommand {
-        return this.executeCommand(command, args);
-    };
-}
+extendWithDefaultCommands(RedisMultiCommand, RedisMultiCommand.commandsExecutor);