Describe the bug

One part of my suggestion (#2950 I hope you find it worthwhile) about source maps in Vite is fixing this thing about that I will talk in this issue.

It is showing an absolute local path to a component in source maps in dev mode.
It looks like a clear bug.

Look:

Both orange (created from source maps) directories are redundant. It looks not nice.

Reproduction

Run any project in dev mode and inspect it.

System Info

Node: 15.9.0
@vitejs/plugin-vue: 1.2.1
vite: 2.1.5

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