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`${code || \"\"}`;\n\n  if (ast) {\n    if (ast.type === \"Program\") {\n      ast = file(ast, [], []);\n    } else if (ast.type !== \"File\") {\n      throw new Error(\"AST root must be a Program or File node\");\n    }\n\n    if (options.cloneInputAst) {\n      ast = cloneDeep(ast);\n    }\n  } else {\n    // @ts-expect-error todo: use babel-types ast typings in Babel parser\n    ast = yield* parser(pluginPasses, options, code);\n  }\n\n  let inputMap = null;\n  if (options.inputSourceMap !== false) {\n    // If an explicit object is passed in, it overrides the processing of\n    // source maps that may be in the file itself.\n    if (typeof options.inputSourceMap === \"object\") {\n      inputMap = convertSourceMap.fromObject(options.inputSourceMap);\n    }\n\n    if (!inputMap) {\n      const lastComment = extractComments(INLINE_SOURCEMAP_REGEX, ast);\n      if (lastComment) {\n        try {\n          inputMap = convertSourceMap.fromComment(\"//\" + lastComment);\n        } catch (err) {\n          if (process.env.BABEL_8_BREAKING) {\n            console.warn(\n              \"discarding unknown inline input sourcemap\",\n              options.filename,\n              err,\n            );\n          } else {\n            debug(\"discarding unknown inline input sourcemap\");\n          }\n        }\n      }\n    }\n\n    if (!inputMap) {\n      const lastComment = extractComments(EXTERNAL_SOURCEMAP_REGEX, ast);\n      if (typeof options.filename === \"string\" && lastComment) {\n        try {\n          // when `lastComment` is non-null, EXTERNAL_SOURCEMAP_REGEX must have matches\n          const match: [string, string] = EXTERNAL_SOURCEMAP_REGEX.exec(\n            lastComment,\n          ) as any;\n          const inputMapContent = fs.readFileSync(\n            path.resolve(path.dirname(options.filename), match[1]),\n            \"utf8\",\n          );\n          inputMap = convertSourceMap.fromJSON(inputMapContent);\n        } catch (err) {\n          debug(\"discarding unknown file input sourcemap\", err);\n        }\n      } else if (lastComment) {\n        debug(\"discarding un-loadable file input sourcemap\");\n      }\n    }\n  }\n\n  return new File(options, {\n    code,\n    ast: ast as t.File,\n    inputMap,\n  });\n}\n\nfunction extractCommentsFromList(\n  regex: RegExp,\n  comments: t.Comment[],\n  lastComment: string | null,\n): [t.Comment[], string | null] {\n  if (comments) {\n    comments = comments.filter(({ value }) => {\n      if (regex.test(value)) {\n        lastComment = value;\n        return false;\n      }\n      return true;\n    });\n  }\n  return [comments, lastComment];\n}\n\nfunction extractComments(regex: RegExp, ast: t.Node) {\n  let lastComment: string = null;\n  traverseFast(ast, node => {\n    [node.leadingComments, lastComment] = extractCommentsFromList(\n      regex,\n      node.leadingComments,\n      lastComment,\n    );\n    [node.innerComments, lastComment] = extractCommentsFromList(\n      regex,\n      node.innerComments,\n      lastComment,\n    );\n    [node.trailingComments, lastComment] = extractCommentsFromList(\n      regex,\n      node.trailingComments,\n      lastComment,\n    );\n  });\n  return 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