/plugins/register-store.js

register-store.js

function registerStore({ module, moduleName, store }) {
  const moduleIsRegistered =
    store._modules.root._children[moduleName] !== undefined
  const stateExists = store.state[moduleName]
  if (!moduleIsRegistered) {
    store.registerModule(moduleName, module, { preserveState: stateExists })
  }
}

export default ({ app }, inject) => {
  inject('registerStore', registerStore)
}