chadtmiller.com/pds.js

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/**
 * The account gate every screen waits on.
 *
 * The last visit's account and repository rows are read synchronously from
 * this origin's storage, so a route's loader can ask the server for a
 * repository on the first frame. The fresh answer then corrects the rows in
 * place. A first visit has nothing to read, and waits for discovery.
 */

import { primeAuthors } from './authors.js';
import { discover, loadRepos, primeFromCache, reposKey } from './git.js';

/** @type {ReturnType<typeof primeFromCache>|undefined} */
let primed;

/**
 * Prime once per page load, and answer the same way after.
 * @returns {ReturnType<typeof primeFromCache>}
 */
export function primeOnce() {
  if (primed === undefined) {
    primeAuthors();
    primed = primeFromCache();
  }
  return primed;
}

/**
 * Discovery names the account and its PDS, and the repository list has to be
 * in hand before any screen renders: every route below the list reads its
 * refs out of that record.
 * @param {import('@tanstack/react-query').QueryClient} queryClient
 */
export async function loadAccount(queryClient) {
  const found = await discover();
  const repos = await loadRepos();
  // The list screen may be showing the previous visit's rows; this hands it
  // the fresh ones in place.
  queryClient.setQueryData([reposKey()], repos);
  return found;
}