nuxt "Uncaught (in promise) TypeError: hook.flushStoreModules is not a function"

Nuxt "Uncaught (in promise) TypeError: hook.flushStoreModules is not a function"

If you have encountered the error "Uncaught (in promise) TypeError: hook.flushStoreModules is not a function" when working with Nuxt, don't worry, you are not alone. This error occurs when the application tries to execute hook.flushStoreModules() but the function is not defined.

Causes of the Error

• The Nuxt version you are using is not compatible with the Vuex version.
• There is a conflict between the modules of Vuex store and the modules of the Nuxt store.
• A custom plugin or module is incorrectly defined or is not compatible with the current version of Nuxt or Vuex.

Solutions

There are several ways to fix this error, depending on what caused it:

Update Nuxt and Vuex Versions

If the error is caused by an incompatibility between Nuxt and Vuex versions, you can update one or both of them to fix the issue. Make sure you update to the latest version of each:

npm install nuxt@latest --save-dev
npm install vuex@latest --save-dev

Check for Module Conflicts

If there is a conflict between the modules of your Vuex store and the modules of your Nuxt store, you can try separating them into different files:

// store/index.js - for Vuex store modules
export const state = () => ({
  counter: 0
})

export const mutations = {
  increment(state) {
    state.counter++
  }
}

// store/nuxt.js - for Nuxt store modules
export const state = () => ({
  message: "Hello, Nuxt!"
})

export const mutations = {
  setMessage(state, message) {
    state.message = message
  }
}

Check Custom Plugins and Modules

If you have custom plugins or modules, make sure they are correctly defined and compatible with the current version of Nuxt and Vuex.

// plugins/my-plugin.js
export default ({ app }, inject) => {
  inject("myPlugin", {
    message: "This is my plugin!"
  })
}

// nuxt.config.js
plugins: [
  "~/plugins/my-plugin.js"
]

By using the above methods, you can get rid of the "Uncaught (in promise) TypeError: hook.flushStoreModules is not a function" error and get back to building your Nuxt application.