Function ssrTransformScript

packages/vite/src/node/ssr/ssrTransform.ts:59–424

(
  code: string,
  inMap: SourceMap | { mappings: '' } | null,
  url: string,
  originalCode: string,
)

}

async function ssrTransformScript(
  code: string,
  inMap: SourceMap | { mappings: '' } | null,
  url: string,
  originalCode: string,
): Promise<TransformResult | null> {
  const s = new MagicString(code)

  let ast: ESTree.Program
  try {
    ast = await rolldownParseAstAsync(code)
  } catch (err) {
    // enhance known rollup errors
    // https://github.com/rollup/rollup/blob/42e587e0e37bc0661aa39fe7ad6f1d7fd33f825c/src/utils/bufferToAst.ts#L17-L22
    if (err.code === 'PARSE_ERROR') {
      err.message = `Parse failure: ${err.message}\n`
      err.id = url
      if (typeof err.pos === 'number') {
        err.loc = numberToPos(code, err.pos)
        err.loc.file = url
        err.frame = generateCodeFrame(code, err.pos)
        err.message += `At file: ${url}:${err.loc.line}:${err.loc.column}`
      } else {
        err.message += `At file: ${url}`
      }
    }
    throw err
  }

  let uid = 0
  const deps = new Set<string>()
  const dynamicDeps = new Set<string>()
  const idToImportMap = new Map<string, string>()
  const declaredConst = new Set<string>()

  const fileStartIndex = getFileStartIndex(code)
  let hoistIndex = fileStartIndex

  function defineImport(
    index: number,
    importNode: (
      | ESTree.ImportDeclaration
      | (ESTree.ExportNamedDeclaration & { source: ESTree.StringLiteral })
      | ESTree.ExportAllDeclaration
    ) & {
      start: number
      end: number
    },
    metadata?: DefineImportMetadata,
  ) {
    const source = importNode.source.value
    deps.add(source)

    // Reduce metadata to undefined if it's all default values
    const metadataArg =
      (metadata?.importedNames?.length ?? 0) > 0
        ? `, ${JSON.stringify(metadata)}`
        : ''