Method generate

packages/@tailwindcss-vite/src/index.ts:456–614

(
    content: string,
    _addWatchFile: (file: string) => void,
    I: Instrumentation,
  )

  // Generate the CSS for the root file. This can return false if the file is
  // not considered a Tailwind root. When this happened, the root can be GCed.
  public async generate(
    content: string,
    _addWatchFile: (file: string) => void,
    I: Instrumentation,
  ): Promise<
    | {
        code: string
        map: string | undefined
      }
    | false
  > {
    let inputPath = idToPath(this.id)

    function addWatchFile(file: string) {
      // Don't watch the input file since it's already a dependency and causes
      // issues with some setups (e.g. Qwik).
      if (file === inputPath) {
        return
      }

      // Scanning `.svg` file containing a `#` or `?` in the path will
      // crash Vite. We work around this for now by ignoring updates to them.
      //
      // https://github.com/tailwindlabs/tailwindcss/issues/16877
      if (/[#?].*\.svg$/.test(file)) {
        return
      }
      _addWatchFile(file)
    }

    let requiresBuildPromise = this.requiresBuild()
    let inputBase = path.dirname(path.resolve(inputPath))

    if (!this.compiler || !this.scanner || (await requiresBuildPromise)) {
      clearRequireCache(Array.from(this.buildDependencies.keys()))
      this.buildDependencies.clear()

      this.addBuildDependency(idToPath(inputPath))

      DEBUG && I.start('Setup compiler')
      let addBuildDependenciesPromises: Promise<void>[] = []
      this.compiler = await compile(content, {
        from: this.enableSourceMaps ? this.id : undefined,
        base: inputBase,
        shouldRewriteUrls: true,
        onDependency: (path) => {
          addWatchFile(path)
          addBuildDependenciesPromises.push(this.addBuildDependency(path))
        },

        customCssResolver: this.customCssResolver,
        customJsResolver: this.customJsResolver,
      })
      await Promise.all(addBuildDependenciesPromises)
      DEBUG && I.end('Setup compiler')

      DEBUG && I.start('Setup scanner')