Function warmupFile

packages/vite/src/node/server/warmup.ts:22–53

(
  server: ViteDevServer,
  environment: DevEnvironment,
  file: string,
)

}

async function warmupFile(
  server: ViteDevServer,
  environment: DevEnvironment,
  file: string,
) {
  // transform html with the `transformIndexHtml` hook as Vite internals would
  // pre-transform the imported JS modules linked. this may cause `transformIndexHtml`
  // plugins to be executed twice, but that's probably fine.
  if (file.endsWith('.html')) {
    const url = htmlFileToUrl(file, server.config.root)
    if (url) {
      try {
        const html = await fs.readFile(file, 'utf-8')
        await server.transformIndexHtml(url, html)
      } catch (e) {
        // Unexpected error, log the issue but avoid an unhandled exception
        environment.logger.error(
          `Pre-transform error (${colors.cyan(file)}): ${e.message}`,
          {
            error: e,
            timestamp: true,
          },
        )
      }
    }
  }
  // for other files, pass it through `transformRequest` with warmup
  else {
    const url = fileToUrl(file, server.config.root)
    await environment.warmupRequest(url)
  }
}

function htmlFileToUrl(file: string, root: string) {
  const url = path.relative(root, file)