Source map error: request failed with status 404

[fritx]

The source-maps exist, but 2.x needs some fix while 3.x looks okay.

I tried to test with https://sourcemaps.io/:

• https://unpkg.com/browse/vue-at@3.0.0-alpha.2/dist/
• https://unpkg.com/browse/vue-at@2.5.1/dist/