`SourceMap` breaks when using `vite-plugin-conditional-compile`

[f4-miyata]

Bug Description
When using vite-plugin-conditional-compile, the sourcemap is broken. This issue occurs in the following environment:

• Vite version: 5.2.6
• vite-plugin-conditional-compile version: 1.4.4
• Operating System: macOS
• Node version: 20.10.0
• Package manager pnpm: 8.15.5

Reproduction
Unfortunately, I cannot provide a link to a repo that can reproduce the problem due to the proprietary nature of the project. However, the issue arises when using the vite-plugin-conditional-compile in the Vite configuration file.

Steps to Reproduce

1. Open the Vite configuration file (vite.config.ts).
2. In the configuration file, set sourcemap: true.
3. Build or run the project.
4. Check the index-xxx.js.map file. At this point, you can confirm that the contents of the file are corrupted.

Config

// excerpt from `vite.config.ts`
plugins: [
  vitePluginConditionalCompile({
    exclude: [
      ...,
    ],
    env: {
      DEV: mode === 'development',
    },
  }),
  ...,
],
...,
build: {
  ..., 
  sourcemap: true,

Thank you so much for creating this plugin. The plugin you've created is extremely valuable to our project and has been of great help. We deeply appreciate your effort and contribution.

[LZS911]

@f4-miyata
Thank you very much for raising the issue. We have released version 1.4.5, which addresses the problem of sourceMaps being lost in the development environment. While the issue of sourceMaps being lost in the production environment has been resolved, testing has revealed that the generated sourceMaps correspond to the code before conditional compilation. I am currently working on finding a solution to this problem.

[f4-miyata]

Thank you for your quick response.

[tluchowski]

@LZS911 Do you happen to have any idea when this could be fixed?

[tluchowski]

Incidentally, another plugin I found that provides similar functionality, has this problem too: unplugin/unplugin-preprocessor-directives#8

[KeJunMao]

Incidentally, another plugin I found that provides similar functionality, has this problem too: unplugin/unplugin-preprocessor-directives#8

fixed!