isSelfAccepting of undefined in Vite 2.9.7 SSR

[saurabhdaware]

Describe the bug

After 2.9.7, Vite started throwing isSelfAccepting of undefined error.

It seems to happen specifically in the case where we pass inlined css through vite.transformIndexHtml.

Also, before facing this issue, I am also facing #6859 (comment) (which I fixed by adding a random file name to "main" property of package.json (seem hacky))

So this issue could be a side-effect of that issue.

Reproduction

https://stackblitz.com/edit/github-12zodn-gvvydc?file=server.js&terminal=dev

System Info

System:
    OS: macOS 11.4
    CPU: (8) x64 Apple M1
    Memory: 26.97 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 16.5.0 - ~/.nvm/versions/node/v16.5.0/bin/node
    Yarn: 1.22.15 - ~/.yarn/bin/yarn
    npm: 7.19.1 - ~/.nvm/versions/node/v16.5.0/bin/npm
  Browsers:
    Brave Browser: 97.1.34.80
    Chrome: 100.0.4896.127
    Safari: 14.1.1

Used Package Manager

npm

Logs

TypeError: Cannot set properties of undefined (setting 'isSelfAccepting')
    at TransformContext.transform (/home/projects/github-12zodn-gvvydc/node_modules/vite/dist/node/chunks/dep-88bd5805.js:56775:48)
    at async Object.transform (/home/projects/github-12zodn-gvvydc/node_modules/vite/dist/node/chunks/dep-88bd5805.js:38911:30)
    at async eval (/home/projects/github-12zodn-gvvydc/node_modules/vite/dist/node/chunks/dep-88bd5805.js:56245:24)
    at async Promise.all (index 0)
    at async devHtmlHook (/home/projects/github-12zodn-gvvydc/node_modules/vite/dist/node/chunks/dep-88bd5805.js:56240:5)
    at async applyHtmlTransforms (/home/projects/github-12zodn-gvvydc/node_modules/vite/dist/node/chunks/dep-88bd5805.js:29471:21)
    at async eval (/home/projects/github-12zodn-gvvydc/server.js:46:18) {
  plugin: 'vite:import-analysis',
  id: '/home/projects/github-12zodn-gvvydc?html-proxy&0.css',
  pluginCode: '\n      body {\n        background-color: red;\n      }\n    '
}

Validations

• Follow our Code of Conduct
• 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.
• 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/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• The provided reproduction is a minimal reproducible example of the bug.

[saurabhdaware]

I did some debugging in repo and it seems to be coming from here-

vite/packages/vite/src/node/plugins/importAnalysis.ts

Line 175 in 968ff69

importerModule.isSelfAccepting = false

Adding a if (importerModule) fixed the issue however there is this comment on the line above which I am not sure if stands true in my case since it does happen to be undefined-

vite/packages/vite/src/node/plugins/importAnalysis.ts

Lines 170 to 172 in 968ff69

	// since we are already in the transform phase of the importer, it must
	// have been loaded so its entry is guaranteed in the module graph.
	const importerModule = moduleGraph.getModuleById(importer)!

If this is the fix, I'll be happy to send a PR Sent the PR with this change :D