Function wrapFiber

packages/react-test-renderer/src/ReactTestRenderer.js:634–644

(fiber: Fiber)

const fiberToWrapper = new WeakMap<Fiber, ReactTestInstance>();
function wrapFiber(fiber: Fiber): ReactTestInstance {
  let wrapper = fiberToWrapper.get(fiber);
  if (wrapper === undefined && fiber.alternate !== null) {
    wrapper = fiberToWrapper.get(fiber.alternate);
  }
  if (wrapper === undefined) {
    wrapper = new ReactTestInstance(fiber);
    fiberToWrapper.set(fiber, wrapper);
  }
  return wrapper;
}

// Enable ReactTestRenderer to be used to test DevTools integration.
injectIntoDevTools();