Function prelude

packager/src/ModuleGraph/ModuleGraph.js:97–102

(optimize)

}

function prelude(optimize) {
  return virtualModule(
    `var __DEV__=${String(!optimize)},` +
    '__BUNDLE_START_TIME__=global.nativePerformanceNow?global.nativePerformanceNow():Date.now();'
  );
}