pushHostContainer() — react Function Reference

Source Code

packages/react-reconciler/src/ReactFiberHostContext.js lines 65–83

function pushHostContainer(fiber: Fiber, nextRootInstance: Container): void {
  // Push current root instance onto the stack;
  // This allows us to reset root when portals are popped.
  push(rootInstanceStackCursor, nextRootInstance, fiber);
  // Track the context and the Fiber that provided it.
  // This enables us to pop only Fibers that provide unique contexts.
  push(contextFiberStackCursor, fiber, fiber);

  // Finally, we need to push the host context to the stack.
  // However, we can't just call getRootHostContext() and push it because
  // we'd have a different number of entries on the stack depending on
  // whether getRootHostContext() throws somewhere in renderer code or not.
  // So we push an empty value first. This lets us safely unwind on errors.
  push(contextStackCursor, null, fiber);
  const nextRootContext = getRootHostContext(nextRootInstance);
  // Now that we know this function doesn't throw, replace it.
  pop(contextStackCursor, fiber);
  push(contextStackCursor, nextRootContext, fiber);
}