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<!DOCTYPE> is case-sensitive #107

@bates64

Description

@bates64

Describe the bug

<!doctype html> causes vite build to crash with a cryptic error stack. The DOCTYPE is case-insensitive.

System Info

  • required vite version: master
  • required Operating System: Windows
  • required Node version: 14.1.0

Logs

Building for production...
[vite] Build errored out.
SyntaxError: Incorrectly opened comment.
    at createCompilerError (C:\Users\alex\Documents\vite\node_modules\@vue\compiler-core\dist\compiler-core.cjs.js:16:19)
    at emitError (C:\Users\alex\Documents\vite\node_modules\@vue\compiler-core\dist\compiler-core.cjs.js:1173:29)
    at parseChildren (C:\Users\alex\Documents\vite\node_modules\@vue\compiler-core\dist\compiler-core.cjs.js:613:25)
    at Object.baseParse (C:\Users\alex\Documents\vite\node_modules\@vue\compiler-core\dist\compiler-core.cjs.js:560:23)
    at Object.parse (C:\Users\alex\Documents\vite\node_modules\@vue\compiler-dom\dist\compiler-dom.cjs.js:2942:25)
    at compileHtml (C:\Users\alex\Documents\vite\dist\build\buildPluginHtml.js:78:32)
    at Object.exports.createBuildHtmlPlugin (C:\Users\alex\Documents\vite\dist\build\buildPluginHtml.js:20:45)
    at async Object.build (C:\Users\alex\Documents\vite\dist\build\index.js:38:41)
    at async runBuild (C:\Users\alex\Documents\vite\dist\cli.js:141:9) {
  code: 11,
  loc: {
    start: { column: 1, line: 1, offset: 0 },
    end: { column: 1, line: 1, offset: 0 },
    source: ''
  }
}

Reproduction

<!doctype html>
$ vite build

This appears to be an issue in @vue/compiler-core. I tried changing this check to use s.toUpperCase() but it looks like vite is using an outdated(?) version of that package right now (so yarn linking it to master breaks vite in other ways).

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