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

import { RedisCommandArguments, RedisCommandArgument } from '.';
import { pushVerdictArguments } from './generic-transformers';
import { transformReply as transformClientInfoReply, ClientInfoReply } from './CLIENT_INFO';

interface ListFilterType {
    TYPE: 'NORMAL' | 'MASTER' | 'REPLICA' | 'PUBSUB';
    ID?: never;
}

interface ListFilterId {
    ID: Array<RedisCommandArgument>;
    TYPE?: never;
}

export type ListFilter = ListFilterType | ListFilterId;

export const IS_READ_ONLY = true;

export function transformArguments(filter?: ListFilter): RedisCommandArguments {
    let args: RedisCommandArguments = ['CLIENT', 'LIST'];

    if (filter) {
        if (filter.TYPE !== undefined) {
            args.push('TYPE', filter.TYPE);
        } else  {
            args.push('ID');
            args = pushVerdictArguments(args, filter.ID);
        }
    }

    return args;
}

export function transformReply(rawReply: string): Array<ClientInfoReply> {
    const split = rawReply.split('\n'),
        length = split.length - 1,
        reply: Array<ClientInfoReply> = [];
    for (let i = 0; i < length; i++) {
        reply.push(transformClientInfoReply(split[i]));
    }
    
    return reply;
}