message: fix sourcemaps generation
diff: @@ -44,6 +44,7 @@ export default async function compile(
  const generator = formatJS(transformedAst, {
  typeAnnotations: false,
  indent: req.stage === 'compileForBundle' ? 1 : 0,
  + format: 'pretty',
  sourceMapTarget: filename,
  sourceFileName: filename,
  inputSourceMap: req.inputSourceMap,
  