Reload virtual module on demand

Clear and concise description of the problem

As a developer I want to be able to reload a specific virtual module on demand via vite’s Server API.

The idea is that the contents of that virtual module change upon an external event / conditon. I want to be able to manually invalidate such module and reload it (and all modules who depend on it) on demand without restarting the whole server.

Suggested solution

const virtualModuleId = 'virtual:example'
const resolvedVirtualModuleId = '\0' + virtualModuleId

const custom = {
  name: 'example',
  enforce: 'pre',
  resolveId: (id) => {
    if (id === virtualModuleId) {
      return resolvedVirtualModuleId
    }
  },
  load: (id) => {
    if (id === resolvedVirtualModuleId) {
      return `...`
    }
  },
}

const server = await createServer({
  plugins: [custom],
  ...
})

// For demo purposes, this is an external condition.
setInterval(() => {
    // This is what I would expect somehow.
    server.reloadModule(resolvedVirtualModuleId)
}, 5000)

await server.listen()

Alternative

No response

Additional context

No response

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn’t already an issue that request the same feature to avoid creating a duplicate.

[bluwy]

Re-opening this. We could expose a server.invalidateModule api to help invalidate a virtual module easily. The HMR update part has been fixed in #10324

[bluwy]

I see 👍 Was just tossing ideas. Not familiar with the module graph API myself. I’d expect invalidating would trigger HMR as well.