Describe the bug

问题一

vscode 编辑器，在 .ts 或 .js 文件里 import .vue 文件，会无法定位到文件，只能定位到 shims-vue.d.ts ，在 .vue 文件里 import .vue 文件则没有问题：

注意联想框里没有 entry.vue 文件：

command + 点击跳转，会跳转到 shims-vue.d.ts：

问题二

.vue 文件里 import .vue 文件可以定位，但会找到两个模块，是同一个文件，但是是不同的范围：

找到了两个 module：

点第一个进去，会选中 <script> 标签内的全部内容

点第二个进去，会选中从 <script> 标签开始，到文件结尾

问题三

import Comp from './xxx/yyy'

如果不写 .vue 以及 index.vue，则不能识别到对应的文件

Reproduction

https://github.com/masquevil/stock

System Info

Output of npx envinfo --system --npmPackages vite,@vitejs/plugin-vue --binaries --browsers:

  System:
    OS: macOS 11.0.1
    CPU: (4) x64 Intel(R) Core(TM) i7-4650U CPU @ 1.70GHz
    Memory: 415.90 MB / 8.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 15.14.0 - /usr/local/bin/node
    Yarn: 1.22.10 - /usr/local/bin/yarn
    npm: 7.11.1 - /usr/local/bin/npm
  Browsers:
    Chrome: 90.0.4430.93
    Firefox: 72.0.2
    Safari: 14.0.1
  npmPackages:
    @vitejs/plugin-vue: ^1.2.1 => 1.2.1 
    vite: ^2.1.5 => 2.1.5 

Used package manager:
yarn

Logs

Before submitting the issue, please make sure you do the following

• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Provide a description in this issue that describes the bug.
• Make sure this is a Vite issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to https://github.com/vuejs/vue-next instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.