node-redis/packages/client/lib/commands/index.ts

import { ClientCommandOptions } from '../client';
import { CommandOptions } from '../command-options';
import { RedisScriptConfig, SHA1 } from '../lua-script';

export type RedisCommandRawReply = string | number | Buffer | null | undefined | Array<RedisCommandRawReply>;

export type RedisCommandArgument = string | Buffer;

export type RedisCommandArguments = Array<RedisCommandArgument> & { preserve?: unknown };

export interface RedisCommand {
    FIRST_KEY_INDEX?: number | ((...args: Array<any>) => RedisCommandArgument | undefined);
    IS_READ_ONLY?: boolean;
    transformArguments(this: void, ...args: Array<any>): RedisCommandArguments;
    transformReply?(this: void, reply: any, preserved?: any): any;
}

export type RedisCommandReply<C extends RedisCommand> =
    C['transformReply'] extends (...args: any) => infer T ? T : RedisCommandRawReply;

export type ConvertArgumentType<Type, ToType> =
    Type extends RedisCommandArgument ? (
        Type extends (string & ToType) ? Type : ToType
    ) : (
        Type extends Set<infer Member> ? Set<ConvertArgumentType<Member, ToType>> : (
            Type extends Map<infer Key, infer Value> ? Map<Key, ConvertArgumentType<Value, ToType>> : (
                Type extends Array<infer Member> ? Array<ConvertArgumentType<Member, ToType>> : (
                    Type extends Date ? Type : (
                        Type extends Record<PropertyKey, any> ? {
                            [Property in keyof Type]: ConvertArgumentType<Type[Property], ToType>
                        } : Type
                    )
                )
            )
        )
    );

export type RedisCommandSignature<
    Command extends RedisCommand,
    Params extends Array<unknown> = Parameters<Command['transformArguments']>
> = <Options extends CommandOptions<ClientCommandOptions>>(
    ...args: Params | [options: Options, ...rest: Params]
) => Promise<
    ConvertArgumentType<
        RedisCommandReply<Command>,
        Options['returnBuffers'] extends true ? Buffer : string
    >
>;

export interface RedisCommands {
    [command: string]: RedisCommand;
}

export interface RedisModule {
    [command: string]: RedisCommand;
}

export interface RedisModules {
    [module: string]: RedisModule;
}

export interface RedisFunction extends RedisCommand {
    NUMBER_OF_KEYS?: number;
}

export interface RedisFunctionLibrary {
    [fn: string]: RedisFunction;
}

export interface RedisFunctions {
    [library: string]: RedisFunctionLibrary;
}

export type RedisScript = RedisScriptConfig & SHA1;

export interface RedisScripts {
    [script: string]: RedisScript;
}

export interface RedisExtensions<
    M extends RedisModules = RedisModules,
    F extends RedisFunctions = RedisFunctions,
    S extends RedisScripts = RedisScripts
> {
    modules?: M;
    functions?: F;
    scripts?: S;
}

export type ExcludeMappedString<S> = string extends S ? never : S;