`resolveId` doesn’t seem to work in webpack

I use resolveId and load to implement the plugin logic:

export default createUnplugin(() => ({
  name: 'unplugin-starter',
  resolveId(id) {
    return id === 'my-unplugin-virtual-id' ? id : null
  },
  load(id) {
    if (id === 'my-unplugin-virtual-id')
      return 'export default \'hello my-unplugin\''
  },
}))

When I used this plugin in webpack, it reported an error. But it’s ok in vite.

import str from 'my-unplugin-virtual-id'

Module not found: Error: Can't resolve 'my-unplugin-virtual-id' in 'D:\Projects\my-unplugin\playground\webpack\src'

This is my minimal demo that can reproduce the problem：https://github.com/Codpoe/unplugin-minimal-demo. And I had this problem on Windows, I haven’t tested it on Mac…

[danielroe]

I’m getting this as well. In case it’s helpful, here are three reproductions:

• unplugin repro: https://github.com/Akryum/unplugin-icons-issue-94/tree/unplugin - see https://github.com/antfu/unplugin-icons/issues/94#issuecomment-940966103
• unplugin-icons + nuxt repro: https://stackblitz.com/edit/nuxt-starter-pbfj9k
• unplugin + nuxt repro: https://stackblitz.com/edit/nuxt-starter-repdpw

[Codpoe]

I tried to do what you said, but it still didn’t work