Function Graph

packager/src/ModuleGraph/Graph.js:58–98

(entryPoints, platform, options, callback = noop)

exports.create = function create(resolve: ResolveFn, load: LoadFn): GraphFn {
  function Graph(entryPoints, platform, options, callback = noop) {
    const {
      log = (console: any),
      optimize = false,
      skip,
    } = options || NO_OPTIONS;

    if (typeof platform !== 'string') {
      log.error('`Graph`, called without a platform');
      callback(Error('The target platform has to be passed'));
      return;
    }

    const loadQueue: LoadQueue = queue(seq(
      ({id, parent}, cb) => resolve(id, parent, platform, options || NO_OPTIONS, cb),
      memoize((file, cb) => load(file, {log, optimize}, cb)),
    ), Number.MAX_SAFE_INTEGER);

    const {collect, loadModule} = createGraphHelpers(loadQueue, skip);

    loadQueue.drain = () => {
      loadQueue.kill();
      callback(null, collect());
    };
    loadQueue.error = error => {
      loadQueue.error = noop;
      loadQueue.kill();
      callback(error);
    };

    let i = 0;
    for (const entryPoint of entryPoints) {
      loadModule(entryPoint, null, i++);
    }

    if (i === 0) {
      log.error('`Graph` called without any entry points');
      loadQueue.kill();
      callback(Error('At least one entry point has to be passed.'));
    }
  }

  return Graph;
};