Function workLoopSync

packages/react-reconciler/src/ReactFiberWorkLoop.js:2681–2686

@noinline

()

// The work loop is an extremely hot path. Tell Closure not to inline it.
/** @noinline */
function workLoopSync() {
  // Perform work without checking if we need to yield between fiber.
  while (workInProgress !== null) {
    performUnitOfWork(workInProgress);
  }
}

function renderRootConcurrent(root: FiberRoot, lanes: Lanes): RootExitStatus {
  const prevExecutionContext = executionContext;