how to code a clear command in discord.js code example

Example: clear command discordJS

client.on('message', (message) => {
  if (!message.content.startsWith(prefix) || message.author.bot) return;

  const args = message.content
    .toLowerCase()
    .slice(prefix.length)
    .trim()
    .split(/\s+/);
  const [command, input] = args;

  if (command === 'clear' || command === 'c') {
    if (!message.member.hasPermission('MANAGE_MESSAGES')) {
      return message.channel
        .send(
          "You cant use this command since you're missing `manage_messages` perm",
        );
    }

    if (isNaN(input)) {
      return message.channel
        .send('enter the amount of messages that you would like to clear')
        .then((sent) => {
          setTimeout(() => {
            sent.delete();
          }, 2500);
        });
    }

    if (Number(input) < 0) {
      return message.channel
        .send('enter a positive number')
        .then((sent) => {
          setTimeout(() => {
            sent.delete();
          }, 2500);
        });
    }

    // add an extra to delete the current message too
    const amount = Number(input) > 100
      ? 101
      : Number(input) + 1;

    message.channel.bulkDelete(amount, true)
    .then((_message) => {
      message.channel
        // do you want to include the current message here?
        // if not it should be ${_message.size - 1}
        .send(`Bot cleared \`${_message.size}\` messages :broom:`)
        .then((sent) => {
          setTimeout(() => {
            sent.delete();
          }, 2500);
        });
    });
  }

  if (command === 'help' && input === 'clear') {
    const newEmbed = new MessageEmbed()
      .setColor('#00B2B2')
      .setTitle('**Clear Help**')
      .setDescription(
        `This command clears messages for example \`${prefix}clear 5\` or \`${prefix}c 5\`.`,
      )
      .setFooter(
        `Requested by ${message.author.tag}`,
        message.author.displayAvatarURL(),
      )
      .setTimestamp();

    message.channel.send(newEmbed);
  }
});