signal-desktop/ts/state/selectors/linkPreviews.ts

// Copyright 2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

import { createSelector } from 'reselect';

import { assert } from '../../util/assert';
import { getDomain } from '../../types/LinkPreview';

import { StateType } from '../reducer';

export const getLinkPreview = createSelector(
  ({ linkPreviews }: StateType) => linkPreviews.linkPreview,
  linkPreview => {
    if (linkPreview) {
      const domain = getDomain(linkPreview.url);
      assert(domain !== undefined, "Domain of linkPreview can't be undefined");

      return {
        ...linkPreview,
        domain,
        isLoaded: true,
      };
    }

    return undefined;
  }
);