Function register

packages/react-refresh/src/ReactFreshRuntime.js:301–344

(type: any, id: string)

}

export function register(type: any, id: string): void {
  if (__DEV__) {
    if (type === null) {
      return;
    }
    if (typeof type !== 'function' && typeof type !== 'object') {
      return;
    }

    // This can happen in an edge case, e.g. if we register
    // return value of a HOC but it returns a cached component.
    // Ignore anything but the first registration for each type.
    if (allFamiliesByType.has(type)) {
      return;
    }
    // Create family or remember to update it.
    // None of this bookkeeping affects reconciliation
    // until the first performReactRefresh() call above.
    let family = allFamiliesByID.get(id);
    if (family === undefined) {
      family = {current: type};
      allFamiliesByID.set(id, family);
    } else {
      pendingUpdates.push([family, type]);
    }
    allFamiliesByType.set(type, family);

    // Visit inner types because we might not have registered them.
    if (typeof type === 'object' && type !== null) {
      switch (getProperty(type, '$$typeof')) {
        case REACT_FORWARD_REF_TYPE:
          register(type.render, id + '$render');
          break;
        case REACT_MEMO_TYPE:
          register(type.type, id + '$type');
          break;
      }
    }
  } else {
    throw new Error(
      'Unexpected call to React Refresh in a production environment.',
    );
  }
}

export function setSignature(
  type: any,