How to add slash commands using discord.js?

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npm install discord.js

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const { Client, Intents } = require('discord.js');
const client = new Client({ intents: [Intents.FLAGS.GUILDS] });

client.login('YOUR_BOT_TOKEN');

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client.on('interactionCreate', async interaction => {
  if (!interaction.isCommand()) return;

  const { commandName } = interaction;

  if (commandName === 'ping') {
    await interaction.reply('Pong!');
  } else if (commandName === 'say') {
    const message = interaction.options.getString('message');
    await interaction.reply(message);
  }
});

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client.on('ready', async () => {
  await client.application.commands.create({
    name: 'ping',
    description: 'Ping command',
  });

  await client.application.commands.create({
    name: 'say',
    description: 'Say command',
    options: [
      {
        name: 'message',
        description: 'Message to say',
        type: 'STRING',
        required: true,
      },
    ],
  });
});

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node <your bot file>