Function performWorkUntilDeadline

docs/external/js/react.development.js:2186–2215

()

    };

    var performWorkUntilDeadline = function () {
      if (scheduledHostCallback !== null) {
        var currentTime = getCurrentTime(); // Yield after `yieldInterval` ms, regardless of where we are in the vsync
        // cycle. This means there's always time remaining at the beginning of
        // the message event.

        deadline = currentTime + yieldInterval;
        var hasTimeRemaining = true;

        try {
          var hasMoreWork = scheduledHostCallback(hasTimeRemaining, currentTime);

          if (!hasMoreWork) {
            isMessageLoopRunning = false;
            scheduledHostCallback = null;
          } else {
            // If there's more work, schedule the next message event at the end
            // of the preceding one.
            port.postMessage(null);
          }
        } catch (error) {
          // If a scheduler task throws, exit the current browser task so the
          // error can be observed.
          port.postMessage(null);
          throw error;
        }
      } else {
        isMessageLoopRunning = false;
      } // Yielding to the browser will give it a chance to paint, so we can
    };

    var channel = new MessageChannel();
    var port = channel.port2;