Function updateContextProvider

code/new-context-api/public/app.js:9665–9738

(current, workInProgress, renderExpirationTime)

  }

  function updateContextProvider(current, workInProgress, renderExpirationTime) {
    var providerType = workInProgress.type;
    var context = providerType.context;

    var newProps = workInProgress.pendingProps;
    var oldProps = workInProgress.memoizedProps;

    if (hasLegacyContextChanged()) {
      // Normally we can bail out on props equality but if context has changed
      // we don't do the bailout and we have to reuse existing props instead.
    } else if (oldProps === newProps) {
      workInProgress.stateNode = 0;
      pushProvider(workInProgress);
      return bailoutOnAlreadyFinishedWork(current, workInProgress);
    }

    var newValue = newProps.value;
    workInProgress.memoizedProps = newProps;

    var changedBits = void 0;
    if (oldProps === null) {
      // Initial render
      changedBits = MAX_SIGNED_31_BIT_INT;
    } else {
      if (oldProps.value === newProps.value) {
        // No change. Bailout early if children are the same.
        if (oldProps.children === newProps.children) {
          workInProgress.stateNode = 0;
          pushProvider(workInProgress);
          return bailoutOnAlreadyFinishedWork(current, workInProgress);
        }
        changedBits = 0;
      } else {
        var oldValue = oldProps.value;
        // Use Object.is to compare the new context value to the old value.
        // Inlined Object.is polyfill.
        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is
        if (oldValue === newValue && (oldValue !== 0 || 1 / oldValue === 1 / newValue) || oldValue !== oldValue && newValue !== newValue // eslint-disable-line no-self-compare
        ) {
            // No change. Bailout early if children are the same.
            if (oldProps.children === newProps.children) {
              workInProgress.stateNode = 0;
              pushProvider(workInProgress);
              return bailoutOnAlreadyFinishedWork(current, workInProgress);
            }
            changedBits = 0;
          } else {
          changedBits = typeof context._calculateChangedBits === 'function' ? context._calculateChangedBits(oldValue, newValue) : MAX_SIGNED_31_BIT_INT;
          {
            warning((changedBits & MAX_SIGNED_31_BIT_INT) === changedBits, 'calculateChangedBits: Expected the return value to be a ' + '31-bit integer. Instead received: %s', changedBits);
          }
          changedBits |= 0;

          if (changedBits === 0) {
            // No change. Bailout early if children are the same.
            if (oldProps.children === newProps.children) {
              workInProgress.stateNode = 0;
              pushProvider(workInProgress);