Function rolldownScanPlugin

packages/vite/src/node/optimizer/scan.ts:363–754

(
  environment: ScanEnvironment,
  depImports: Record<string, string>,
  missing: Record<string, string>,
  entries: string[],
  jsxOptions: OxcTransformOptions['jsx'],
)

const svelteModuleRE = /\smodule\b/i

function rolldownScanPlugin(
  environment: ScanEnvironment,
  depImports: Record<string, string>,
  missing: Record<string, string>,
  entries: string[],
  jsxOptions: OxcTransformOptions['jsx'],
): Plugin[] {
  const seen = new Map<string, string | undefined>()
  async function resolveId(
    id: string,
    importer?: string,
    options?: Parameters<EnvironmentPluginContainer['resolveId']>[2],
  ): Promise<PartialResolvedId | null> {
    return environment.pluginContainer.resolveId(
      id,
      importer && normalizePath(importer),
      { scan: true, ...options },
    )
  }
  const resolve = async (
    id: string,
    importer?: string,
    options?: Parameters<typeof resolveId>[2],
  ) => {
    const key = JSON.stringify([
      id,
      importer && path.dirname(importer),
      options,
    ])
    if (seen.has(key)) {
      return seen.get(key)
    }
    const resolved = await resolveId(id, importer, options)
    const res = resolved?.id
    seen.set(key, res)
    return res
  }

  const optimizeDepsOptions = environment.config.optimizeDeps
  const include = optimizeDepsOptions.include
  const exclude = [
    ...(optimizeDepsOptions.exclude ?? []),
    '@vite/client',
    '@vite/env',
  ]

  const externalUnlessEntry = ({ path }: { path: string }) => ({
    id: path,
    external: !entries.includes(path),
  })

  const doTransformGlobImport = async (
    contents: string,
    id: string,
    loader: Loader,
  ) => {
    let transpiledContents: string
    // transpile because `transformGlobImport` only expects js