Update your @nuxtjs/eslint-module from v2 to v3. nuxt.config.js

nuxt.config.js

// Before

export default {
  build: {
    extend(config, { isDev, isClient }) {
      if (isDev && isClient) {
        config.module.rules.push({
          enforce: 'pre',
          test: /\.(js|vue)$/,
          loader: 'eslint-loader',
          exclude: /(node_modules)/
        })
      }
    }
  }
}



// After


export default {
	// Run ESLint on save
  build: {
    extend(config, { isDev, isClient }) {
      if (ctx.isDev && ctx.isClient) {
        const options = {
          exclude: ['node_modules']
        }
        const EslintPlugin = require('eslint-webpack-plugin')
        config.plugins.push(new EslintPlugin(options))
    }
  }
}