[Feature request] Improve shouldPrefetch and shouldPrefetch option #952

Clear and concise description of the problem

Currenly the (file: string, type: string) => boolean is TOO unmeaningful.

The file args in vite is the output chunk name, which is probably like index.html.xxxx.js.

It lost infoamtion about how it was generated, so users at this time have No idea about what's page is this chunk generated from. So it's impossible for a developer or a user to take actual effect when setting a function.

Just an example, I am getting hundreds of index.html.xxxx.js in https://github.com/vuepress-theme-hope/v2/tree/gh-pages/assets.

Suggested solution

The parameters should be rebuilt. At least it should include:

• chunk filename

• chunk filetype (can be ommited if filename contains extension). Also I am confused why current api seperate a full chunk path into file name and file type.

• chunk infomation about how this chunk is generated.

  Could be things like:

{from: 'markdown', source: 'path/to/markdown.md'}

{from:'import', source: 'path/to/files/where/the/chunk/is/imported.ts'}

{from:'script', source: 'path/to/file/entry.ts'}

Edited: In some cases we might get an array here, so we can use array formats.

Alternative

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Additional context

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