chomens-bot-js/plugins/proxy/custom_chat.js

function inject (bot, client, target) {
  const { MessageBuilder } = require('prismarine-chat')(bot.version)
  client.on('packet', (data, meta) => {
    if (meta.name === 'chat' &&
        !data.message?.startsWith('/') &&
        !data.message?.startsWith('.')
    ) {
      const codeParsedMessage = data.message.replace(/%[^%]+%/g, (code) => {
        try {
        // eslint-disable-next-line no-eval
          return eval(code.substring(1).slice(0, -1))
        } catch (e) {
          return code
        }
      })
      bot.tellraw('@a', {
        color: 'dark_gray',
        translate: '[%s] [%s] %s \u203a %s',
        with: [
          {
            text: 'Chat',
            color: 'gray'
          },
          {
            text: 'Proxy',
            color: 'gray'
          },
          {
            text: client.username,
            color: 'green'
          },
          MessageBuilder.fromString('&7' + codeParsedMessage)
        ]
      })
    }
  })
};

module.exports = { inject }