Describe the bug

When including Typescript, the generated source map for each file maps it the file to input.ts. This causes problems with breakpoints, as well as logging locations. Additionally, during loading in the Chrome debugger, you can sometimes see all Typescript files flash as input.ts.

Reproduction

$ npx create-vite-app
$ npm i
$ echo "console.log('test')" > test.ts
$ echo "import './test'" >> main.js
$ npm run dev

$ curl 'http://localhost:3000/test.ts'
> console.log("test");
> 
> 
> //# sourceMappingURL=data:application/json;base64,ewogICJ2ZXJzaW9uIjogMywKICAic291cmNlcyI6IFsiL2lucHV0LnRzIl0sCiAgInNvdXJjZXNDb250ZW50IjogWyJjb25zb2xlLmxvZygndGVzdCcpXG4iXSwKICAibWFwcGluZ3MiOiAiQUFBQSxRQUFRLElBQUk7IiwKICAibmFtZXMiOiBbXQp9Cg==

The sourcemap decodes to:

{
  "version": 3,
  "sources": ["/input.ts"],
  "sourcesContent": ["console.log('test')\n"],
  "mappings": "AAAA,QAAQ,IAAI;",
  "names": []
}

System Info

• required vite version: 0.14.4, 0.10.x
• required Operating System: Ubuntu, Windows, WSL
• required Node version: 12.11.1, 12.13.1
• Optional:
  • npm/yarn version: 6.11.3, 6.14.5
  • Installed vue version: 3.0.0-beta.10
  • Installed @vue/compiler-sfc version: 3.0.0-beta.10