I'm now seeing this warning appear using v1.4.0.
In my devDependencies: "@nuxtjs/dayjs": "^1.4.0"
in my nuxt.config.js: @nuxtjs/dayjs
The command 'nuxt build' finished but did not exit after 5s
This is most likely not caused by a bug in Nuxt
Make sure to cleanup all timers and listeners you or your plugins/modules start.
Nuxt will now force exit
DeprecationWarning: Starting with Nuxt version 3 this will be a fatal error

I'm now seeing this warning appear using v1.4.0.
In my devDependencies:
"@nuxtjs/dayjs": "^1.4.0"in my nuxt.config.js:
@nuxtjs/dayjs