Callback was already called

[shaunc869]

Version

3.0.0-beta.15

Reproduction link

https://codesandbox.io/s/nkx106k5yl

Steps to reproduce

Run yarn pmd

What is expected?

The app builds and launches.

What is actually happening?

I get the error:

$ vue-cli-service serve --open --mode pmd
INFO Starting development server...
(node:18771) DeprecationWarning: Tapable.plugin is deprecated. Use new API on .hooks instead
Starting type checking and linting service...
Using 1 worker with 2048MB memory limit
68% building modules 928/946 modules 18 active …/UserAvatar.vue?vue&type=script&lang=ts/Users/hackintosh/PycharmProjects/spm-ts/node_modules/neo-async/async.js:14
throw new Error('Callback was already called.');
^

Error: Callback was already called.
at throwError (/Users/hackintosh/PycharmProjects/spm-ts/node_modules/neo-async/async.js:14:11)
at /Users/hackintosh/PycharmProjects/spm-ts/node_modules/neo-async/async.js:2805:7
at _combinedTickCallback (internal/process/next_tick.js:131:7)
at process._tickCallback (internal/process/next_tick.js:180:9)
error Command failed with exit code 1.

---

This happened when I upgraded from vue-cli beta 6 to beta 15.

[yyx990803]

Sorry but this is not a valid reproduction.

[shaunc869]

This was caused oddly by vuedraggable I have no idea why, but just in case someone else runs across this. I was able to comment it out as I am not currently using it in my code. Please close this issue, thanks!