"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
function _graph() {
  const data = require("@parcel/graph");
  _graph = function () {
    return data;
  };
  return data;
}
function _assert() {
  const data = _interopRequireDefault(require("assert"));
  _assert = function () {
    return data;
  };
  return data;
}
function _plugin() {
  const data = require("@parcel/plugin");
  _plugin = function () {
    return data;
  };
  return data;
}
function _utils() {
  const data = require("@parcel/utils");
  _utils = function () {
    return data;
  };
  return data;
}
function _nullthrows() {
  const data = _interopRequireDefault(require("nullthrows"));
  _nullthrows = function () {
    return data;
  };
  return data;
}
function _path() {
  const data = _interopRequireDefault(require("path"));
  _path = function () {
    return data;
  };
  return data;
}
function _diagnostic() {
  const data = require("@parcel/diagnostic");
  _diagnostic = function () {
    return data;
  };
  return data;
}
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
// Default options by http version.
const HTTP_OPTIONS = {
  '1': {
    minBundles: 1,
    manualSharedBundles: [],
    minBundleSize: 30000,
    maxParallelRequests: 6,
    disableSharedBundles: false
  },
  '2': {
    minBundles: 1,
    manualSharedBundles: [],
    minBundleSize: 20000,
    maxParallelRequests: 25,
    disableSharedBundles: false
  }
};

/* BundleRoot - An asset that is the main entry of a Bundle. */

const dependencyPriorityEdges = {
  sync: 1,
  parallel: 2,
  lazy: 3
};

// IdealGraph is the structure we will pass to decorate,
// which mutates the assetGraph into the bundleGraph we would
// expect from default bundler
/**
 *
 * The Bundler works by creating an IdealGraph, which contains a BundleGraph that models bundles
 * connected to other bundles by what references them, and thus models BundleGroups.
 *
 * First, we enter `bundle({bundleGraph, config})`. Here, "bundleGraph" is actually just the
 * assetGraph turned into a type `MutableBundleGraph`, which will then be mutated in decorate,
 * and turned into what we expect the bundleGraph to be as per the old (default) bundler structure
 *  & what the rest of Parcel expects a BundleGraph to be.
 *
 * `bundle({bundleGraph, config})` First gets a Mapping of target to entries, In most cases there is
 *  only one target, and one or more entries. (Targets are pertinent in monorepos or projects where you
 *  will have two or more distDirs, or output folders.) Then calls create IdealGraph and Decorate per target.
 *
 */
var _default = exports.default = new (_plugin().Bundler)({
  loadConfig({
    config,
    options,
    logger
  }) {
    return loadBundlerConfig(config, options, logger);
  },
  bundle({
    bundleGraph,
    config,
    logger
  }) {
    let targetMap = getEntryByTarget(bundleGraph); // Organize entries by target output folder/ distDir
    let graphs = [];
    for (let entries of targetMap.values()) {
      // Create separate bundleGraphs per distDir
      graphs.push(createIdealGraph(bundleGraph, config, entries, logger));
    }
    for (let g of graphs) {
      decorateLegacyGraph(g, bundleGraph); //mutate original graph
    }
  },

  optimize() {}
});
function decorateLegacyGraph(idealGraph, bundleGraph) {
  let idealBundleToLegacyBundle = new Map();
  let {
    bundleGraph: idealBundleGraph,
    dependencyBundleGraph,
    bundleGroupBundleIds,
    manualAssetToBundle
  } = idealGraph;
  let entryBundleToBundleGroup = new Map();
  // Step Create Bundles: Create bundle groups, bundles, and shared bundles and add assets to them
  for (let [bundleNodeId, idealBundle] of idealBundleGraph.nodes.entries()) {
    if (!idealBundle || idealBundle === 'root') continue;
    let entryAsset = idealBundle.mainEntryAsset;
    let bundleGroups = [];
    let bundleGroup;
    let bundle;
    if (bundleGroupBundleIds.has(bundleNodeId)) {
      (0, _assert().default)(idealBundle.manualSharedBundle == null, 'Unstable Manual Shared Bundle feature is processing a manualSharedBundle as a BundleGroup');
      let dependencies = dependencyBundleGraph.getNodeIdsConnectedTo(dependencyBundleGraph.getNodeIdByContentKey(String(bundleNodeId)), _graph().ALL_EDGE_TYPES).map(nodeId => {
        let dependency = (0, _nullthrows().default)(dependencyBundleGraph.getNode(nodeId));
        (0, _assert().default)(dependency.type === 'dependency');
        return dependency.value;
      });
      (0, _assert().default)(entryAsset != null, 'Processing a bundleGroup with no entry asset');
      for (let dependency of dependencies) {
        bundleGroup = bundleGraph.createBundleGroup(dependency, idealBundle.target);
        bundleGroups.push(bundleGroup);
      }
      (0, _assert().default)(bundleGroup);
      entryBundleToBundleGroup.set(bundleNodeId, bundleGroup);
      bundle = (0, _nullthrows().default)(bundleGraph.createBundle({
        entryAsset: (0, _nullthrows().default)(entryAsset),
        needsStableName: idealBundle.needsStableName,
        bundleBehavior: idealBundle.bundleBehavior,
        target: idealBundle.target,
        manualSharedBundle: idealBundle.manualSharedBundle
      }));
      bundleGraph.addBundleToBundleGroup(bundle, bundleGroup);
    } else if (idealBundle.sourceBundles.size > 0 && !idealBundle.mainEntryAsset) {
      let uniqueKey = idealBundle.uniqueKey != null ? idealBundle.uniqueKey : [...idealBundle.assets].map(asset => asset.id).join(',');
      bundle = (0, _nullthrows().default)(bundleGraph.createBundle({
        uniqueKey,
        needsStableName: idealBundle.needsStableName,
        bundleBehavior: idealBundle.bundleBehavior,
        type: idealBundle.type,
        target: idealBundle.target,
        env: idealBundle.env,
        manualSharedBundle: idealBundle.manualSharedBundle
      }));
    } else if (idealBundle.uniqueKey != null) {
      bundle = (0, _nullthrows().default)(bundleGraph.createBundle({
        uniqueKey: idealBundle.uniqueKey,
        needsStableName: idealBundle.needsStableName,
        bundleBehavior: idealBundle.bundleBehavior,
        type: idealBundle.type,
        target: idealBundle.target,
        env: idealBundle.env,
        manualSharedBundle: idealBundle.manualSharedBundle
      }));
    } else {
      (0, _assert().default)(entryAsset != null);
      bundle = (0, _nullthrows().default)(bundleGraph.createBundle({
        entryAsset,
        needsStableName: idealBundle.needsStableName,
        bundleBehavior: idealBundle.bundleBehavior,
        target: idealBundle.target,
        manualSharedBundle: idealBundle.manualSharedBundle
      }));
    }
    idealBundleToLegacyBundle.set(idealBundle, bundle);
    for (let asset of idealBundle.assets) {
      bundleGraph.addAssetToBundle(asset, bundle);
    }
  }
  // Step Internalization: Internalize dependencies for bundles
  for (let idealBundle of idealBundleGraph.nodes) {
    if (!idealBundle || idealBundle === 'root') continue;
    let bundle = (0, _nullthrows().default)(idealBundleToLegacyBundle.get(idealBundle));
    if (idealBundle.internalizedAssets) {
      idealBundle.internalizedAssets.forEach(internalized => {
        let incomingDeps = bundleGraph.getIncomingDependencies(idealGraph.assets[internalized]);
        for (let incomingDep of incomingDeps) {
          if (incomingDep.priority === 'lazy' && incomingDep.specifierType !== 'url' && bundle.hasDependency(incomingDep)) {
            bundleGraph.internalizeAsyncDependency(bundle, incomingDep);
          }
        }
      });
    }
  }
  // Unstable Manual Shared Bundles
  // NOTE: This only works under the assumption that manual shared bundles would have
  // always already been loaded before the bundle that requires internalization.
  for (let manualSharedAsset of manualAssetToBundle.keys()) {
    let incomingDeps = bundleGraph.getIncomingDependencies(manualSharedAsset);
    for (let incomingDep of incomingDeps) {
      if (incomingDep.priority === 'lazy' && incomingDep.specifierType !== 'url') {
        let bundles = bundleGraph.getBundlesWithDependency(incomingDep);
        for (let bundle of bundles) {
          bundleGraph.internalizeAsyncDependency(bundle, incomingDep);
        }
      }
    }
  }

  // Step Add to BundleGroups: Add bundles to their bundle groups
  idealBundleGraph.traverse((nodeId, _, actions) => {
    let node = idealBundleGraph.getNode(nodeId);
    if (node === 'root') {
      return;
    }
    actions.skipChildren();
    let outboundNodeIds = idealBundleGraph.getNodeIdsConnectedFrom(nodeId);
    let entryBundle = (0, _nullthrows().default)(idealBundleGraph.getNode(nodeId));
    (0, _assert().default)(entryBundle !== 'root');
    let legacyEntryBundle = (0, _nullthrows().default)(idealBundleToLegacyBundle.get(entryBundle));
    for (let id of outboundNodeIds) {
      let siblingBundle = (0, _nullthrows().default)(idealBundleGraph.getNode(id));
      (0, _assert().default)(siblingBundle !== 'root');
      let legacySiblingBundle = (0, _nullthrows().default)(idealBundleToLegacyBundle.get(siblingBundle));
      bundleGraph.createBundleReference(legacyEntryBundle, legacySiblingBundle);
    }
  });

  // Step References: Add references to all bundles
  for (let [asset, references] of idealGraph.assetReference) {
    for (let [dependency, bundle] of references) {
      let legacyBundle = (0, _nullthrows().default)(idealBundleToLegacyBundle.get(bundle));
      bundleGraph.createAssetReference(dependency, asset, legacyBundle);
    }
  }
  for (let {
    from,
    to
  } of idealBundleGraph.getAllEdges()) {
    let sourceBundle = (0, _nullthrows().default)(idealBundleGraph.getNode(from));
    if (sourceBundle === 'root') {
      continue;
    }
    (0, _assert().default)(sourceBundle !== 'root');
    let legacySourceBundle = (0, _nullthrows().default)(idealBundleToLegacyBundle.get(sourceBundle));
    let targetBundle = (0, _nullthrows().default)(idealBundleGraph.getNode(to));
    if (targetBundle === 'root') {
      continue;
    }
    (0, _assert().default)(targetBundle !== 'root');
    let legacyTargetBundle = (0, _nullthrows().default)(idealBundleToLegacyBundle.get(targetBundle));
    bundleGraph.createBundleReference(legacySourceBundle, legacyTargetBundle);
  }
}
function createIdealGraph(assetGraph, config, entries, logger) {
  // Asset to the bundle and group it's an entry of
  let bundleRoots = new Map();
  let bundles = new Map();
  let dependencyBundleGraph = new (_graph().ContentGraph)();
  let assetReference = new (_utils().DefaultMap)(() => []);

  // A Graph of Bundles and a root node (dummy string), which models only Bundles, and connections to their
  // referencing Bundle. There are no actual BundleGroup nodes, just bundles that take on that role.
  let bundleGraph = new (_graph().Graph)();
  let stack = [];
  let bundleRootEdgeTypes = {
    parallel: 1,
    lazy: 2
  };
  // Graph that models bundleRoots, with parallel & async deps only to inform reachability
  let bundleRootGraph = new (_graph().Graph)();
  let assetToBundleRootNodeId = new Map();
  let bundleGroupBundleIds = new Set();
  let bundleGraphRootNodeId = (0, _nullthrows().default)(bundleGraph.addNode('root'));
  bundleGraph.setRootNodeId(bundleGraphRootNodeId);
  // Step Create Entry Bundles
  for (let [asset, dependency] of entries) {
    let bundle = createBundle({
      asset,
      target: (0, _nullthrows().default)(dependency.target),
      needsStableName: dependency.isEntry
    });
    let nodeId = bundleGraph.addNode(bundle);
    bundles.set(asset.id, nodeId);
    bundleRoots.set(asset, [nodeId, nodeId]);
    bundleGraph.addEdge(bundleGraphRootNodeId, nodeId);
    dependencyBundleGraph.addEdge(dependencyBundleGraph.addNodeByContentKeyIfNeeded(dependency.id, {
      value: dependency,
      type: 'dependency'
    }), dependencyBundleGraph.addNodeByContentKeyIfNeeded(String(nodeId), {
      value: bundle,
      type: 'bundle'
    }), dependencyPriorityEdges[dependency.priority]);
    bundleGroupBundleIds.add(nodeId);
  }
  let assets = [];
  let assetToIndex = new Map();
  //Manual is a map of the user-given name to the bundle node Id that corresponds to ALL the assets that match any glob in that user-specified array
  let manualSharedMap = new Map();
  // May need a map to be able to look up NON- bundle root assets which need special case instructions
  // Use this when placing assets into bundles, to avoid duplication
  let manualAssetToBundle = new Map();
  let {
    manualAssetToConfig,
    constantModuleToMSB
  } = function makeManualAssetToConfigLookup() {
    let manualAssetToConfig = new Map();
    let constantModuleToMSB = new (_utils().DefaultMap)(() => []);
    if (config.manualSharedBundles.length === 0) {
      return {
        manualAssetToConfig,
        constantModuleToMSB
      };
    }
    let parentsToConfig = new (_utils().DefaultMap)(() => []);
    for (let c of config.manualSharedBundles) {
      if (c.root != null) {
        parentsToConfig.get(_path().default.join(config.projectRoot, c.root)).push(c);
      }
    }
    let numParentsToFind = parentsToConfig.size;
    let configToParentAsset = new Map();
    assetGraph.traverse((node, _, actions) => {
      if (node.type === 'asset' && parentsToConfig.has(node.value.filePath)) {
        for (let c of parentsToConfig.get(node.value.filePath)) {
          configToParentAsset.set(c, node.value);
        }
        numParentsToFind--;
        if (numParentsToFind === 0) {
          // If we've found all parents we can stop traversal
          actions.stop();
        }
      }
    });

    // Process in reverse order so earlier configs take precedence
    for (let c of config.manualSharedBundles.reverse()) {
      if (c.root != null && !configToParentAsset.has(c)) {
        logger.warn({
          origin: '@parcel/bundler-default',
          message: `Manual shared bundle "${c.name}" skipped, no root asset found`
        });
        continue;
      }
      let parentAsset = configToParentAsset.get(c);
      let assetRegexes = c.assets.map(glob => (0, _utils().globToRegex)(glob));
      assetGraph.traverse((node, _, actions) => {
        if (node.type === 'asset' && (!Array.isArray(c.types) || c.types.includes(node.value.type))) {
          // +1 accounts for leading slash
          let projectRelativePath = node.value.filePath.slice(config.projectRoot.length + 1);
          if (!assetRegexes.some(regex => regex.test(projectRelativePath))) {
            return;
          }

          // We track all matching MSB's for constant modules as they are never duplicated
          // and need to be assigned to all matching bundles
          if (node.value.meta.isConstantModule === true) {
            constantModuleToMSB.get(node.value).push(c);
          }
          manualAssetToConfig.set(node.value, c);
          return;
        }
        if (node.type === 'dependency' && node.value.priority === 'lazy' && parentAsset) {
          // Don't walk past the bundle group assets
          actions.skipChildren();
        }
      }, parentAsset);
    }
    return {
      manualAssetToConfig,
      constantModuleToMSB
    };
  }();
  let manualBundleToInternalizedAsset = new (_utils().DefaultMap)(() => []);

  /**
   * Step Create Bundles: Traverse the assetGraph (aka MutableBundleGraph) and create bundles
   * for asset type changes, parallel, inline, and async or lazy dependencies,
   * adding only that asset to each bundle, not its entire subgraph.
   */
  assetGraph.traverse({
    enter(node, context, actions) {
      if (node.type === 'asset') {
        if ((context === null || context === void 0 ? void 0 : context.type) === 'dependency' && context !== null && context !== void 0 && context.value.isEntry && !entries.has(node.value)) {
          // Skip whole subtrees of other targets by skipping those entries
          actions.skipChildren();
          return node;
        }
        assetToIndex.set(node.value, assets.length);
        assets.push(node.value);
        let bundleIdTuple = bundleRoots.get(node.value);
        if (bundleIdTuple && bundleIdTuple[0] === bundleIdTuple[1]) {
          // Push to the stack (only) when a new bundle is created
          stack.push([node.value, bundleIdTuple[0]]);
        } else if (bundleIdTuple) {
          // Otherwise, push on the last bundle that marks the start of a BundleGroup
          stack.push([node.value, stack[stack.length - 1][1]]);
        }
      } else if (node.type === 'dependency') {
        if (context == null) {
          return node;
        }
        let dependency = node.value;
        (0, _assert().default)((context === null || context === void 0 ? void 0 : context.type) === 'asset');
        let assets = assetGraph.getDependencyAssets(dependency);
        if (assets.length === 0) {
          return node;
        }
        for (let childAsset of assets) {
          let bundleId = bundles.get(childAsset.id);
          let bundle;

          // MSB Step 1: Match glob on filepath and type for any asset
          let manualSharedBundleKey;
          let manualSharedObject = manualAssetToConfig.get(childAsset);
          if (manualSharedObject) {
            // MSB Step 2: Generate a key for which to look up this manual bundle with
            manualSharedBundleKey = manualSharedObject.name + ',' + childAsset.type;
          }
          if (
          // MSB Step 3: If a bundle for these globs already exsits, use it
          manualSharedBundleKey != null && manualSharedMap.has(manualSharedBundleKey)) {
            bundleId = (0, _nullthrows().default)(manualSharedMap.get(manualSharedBundleKey));
          }
          if (dependency.priority === 'lazy' || childAsset.bundleBehavior === 'isolated' // An isolated Dependency, or Bundle must contain all assets it needs to load.
          ) {
            if (bundleId == null) {
              var _dependency$bundleBeh;
              let firstBundleGroup = (0, _nullthrows().default)(bundleGraph.getNode(stack[0][1]));
              (0, _assert().default)(firstBundleGroup !== 'root');
              bundle = createBundle({
                asset: childAsset,
                target: firstBundleGroup.target,
                needsStableName: dependency.bundleBehavior === 'inline' || childAsset.bundleBehavior === 'inline' ? false : dependency.isEntry || dependency.needsStableName,
                bundleBehavior: (_dependency$bundleBeh = dependency.bundleBehavior) !== null && _dependency$bundleBeh !== void 0 ? _dependency$bundleBeh : childAsset.bundleBehavior
              });
              bundleId = bundleGraph.addNode(bundle);
              bundles.set(childAsset.id, bundleId);
              bundleRoots.set(childAsset, [bundleId, bundleId]);
              bundleGroupBundleIds.add(bundleId);
              bundleGraph.addEdge(bundleGraphRootNodeId, bundleId);
              if (manualSharedObject) {
                // MSB Step 4: If this was the first instance of a match, mark mainAsset for internalization
                // since MSBs should not have main entry assets
                manualBundleToInternalizedAsset.get(bundleId).push(childAsset);
              }
            } else {
              bundle = (0, _nullthrows().default)(bundleGraph.getNode(bundleId));
              (0, _assert().default)(bundle !== 'root');
              if (
              // If this dependency requests isolated, but the bundle is not,
              // make the bundle isolated for all uses.
              dependency.bundleBehavior === 'isolated' && bundle.bundleBehavior == null) {
                bundle.bundleBehavior = dependency.bundleBehavior;
              }
            }
            dependencyBundleGraph.addEdge(dependencyBundleGraph.addNodeByContentKeyIfNeeded(dependency.id, {
              value: dependency,
              type: 'dependency'
            }), dependencyBundleGraph.addNodeByContentKeyIfNeeded(String(bundleId), {
              value: bundle,
              type: 'bundle'
            }), dependencyPriorityEdges[dependency.priority]);
          } else if (dependency.priority === 'parallel' || childAsset.bundleBehavior === 'inline') {
            // The referencing bundleRoot is the root of a Bundle that first brings in another bundle (essentially the FIRST parent of a bundle, this may or may not be a bundleGroup)
            let [referencingBundleRoot, bundleGroupNodeId] = (0, _nullthrows().default)(stack[stack.length - 1]);
            let bundleGroup = (0, _nullthrows().default)(bundleGraph.getNode(bundleGroupNodeId));
            (0, _assert().default)(bundleGroup !== 'root');
            let referencingBundleId = (0, _nullthrows().default)(bundleRoots.get(referencingBundleRoot))[0];
            let referencingBundle = (0, _nullthrows().default)(bundleGraph.getNode(referencingBundleId));
            (0, _assert().default)(referencingBundle !== 'root');
            if (bundleId == null) {
              var _dependency$bundleBeh2;
              bundle = createBundle({
                // Bundles created from type changes shouldn't have an entry asset.
                asset: childAsset,
                type: childAsset.type,
                env: childAsset.env,
                bundleBehavior: (_dependency$bundleBeh2 = dependency.bundleBehavior) !== null && _dependency$bundleBeh2 !== void 0 ? _dependency$bundleBeh2 : childAsset.bundleBehavior,
                target: referencingBundle.target,
                needsStableName: childAsset.bundleBehavior === 'inline' || dependency.bundleBehavior === 'inline' || dependency.priority === 'parallel' && !dependency.needsStableName ? false : referencingBundle.needsStableName
              });
              bundleId = bundleGraph.addNode(bundle);
            } else {
              bundle = bundleGraph.getNode(bundleId);
              (0, _assert().default)(bundle != null && bundle !== 'root');
              if (
              // If this dependency requests isolated, but the bundle is not,
              // make the bundle isolated for all uses.
              dependency.bundleBehavior === 'isolated' && bundle.bundleBehavior == null) {
                bundle.bundleBehavior = dependency.bundleBehavior;
              }
            }
            bundles.set(childAsset.id, bundleId);

            // A bundle can belong to multiple bundlegroups, all the bundle groups of it's
            // ancestors, and all async and entry bundles before it are "bundle groups"
            // TODO: We may need to track bundles to all bundleGroups it belongs to in the future.
            bundleRoots.set(childAsset, [bundleId, bundleGroupNodeId]);
            bundleGraph.addEdge(referencingBundleId, bundleId);
            if (bundleId != bundleGroupNodeId) {
              dependencyBundleGraph.addEdge(dependencyBundleGraph.addNodeByContentKeyIfNeeded(dependency.id, {
                value: dependency,
                type: 'dependency'
              }), dependencyBundleGraph.addNodeByContentKeyIfNeeded(String(bundleId), {
                value: bundle,
                type: 'bundle'
              }), dependencyPriorityEdges.parallel);
            }
            assetReference.get(childAsset).push([dependency, bundle]);
          } else {
            bundleId = null;
          }
          if (manualSharedObject && bundleId != null) {
            // MSB Step 5:  At this point we've either created or found an existing MSB bundle
            // add the asset if it doesn't already have it and set key

            (0, _assert().default)(bundle !== 'root' && bundle != null && bundleId != null);
            manualAssetToBundle.set(childAsset, bundleId);
            if (!bundle.assets.has(childAsset)) {
              // Add asset to bundle
              bundle.assets.add(childAsset);
              bundle.size += childAsset.stats.size;
            }
            bundles.set(childAsset.id, bundleId);
            bundleRoots.set(childAsset, [bundleId, bundleId]);
            (0, _assert().default)(manualSharedBundleKey != null);
            // Ensure we set key to BundleId so the next glob match uses the appropriate bundle
            if (!manualSharedMap.has(manualSharedBundleKey)) {
              manualSharedMap.set(manualSharedBundleKey, bundleId);
            }
            bundle.manualSharedBundle = manualSharedObject.name;
            bundle.uniqueKey = manualSharedObject.name + childAsset.type;
          }
        }
      }
      return node;
    },
    exit(node) {
      var _stack;
      if (((_stack = stack[stack.length - 1]) === null || _stack === void 0 ? void 0 : _stack[0]) === node.value) {
        stack.pop();
      }
    }
  }, null, {
    skipUnusedDependencies: true
  });

  // Strip MSBs of entries
  for (let [nodeId, internalizedAssets] of manualBundleToInternalizedAsset.entries()) {
    let bundle = bundleGraph.getNode(nodeId);
    (0, _assert().default)(bundle != null && bundle !== 'root');
    if (!bundle.internalizedAssets) {
      bundle.internalizedAssets = new (_graph().BitSet)(assets.length);
    }
    for (let asset of internalizedAssets) {
      bundle.internalizedAssets.add((0, _nullthrows().default)(assetToIndex.get(asset)));
    }
    bundle.mainEntryAsset = null;
    bundleGroupBundleIds.delete(nodeId); // manual bundles can now act as shared, non-bundle group, should they be non-bundleRoots as well?
  }

  /**
   *  Step Determine Reachability: Determine reachability for every asset from each bundleRoot.
   * This is later used to determine which bundles to place each asset in. We build up two
   * structures, one traversal each. ReachableRoots to store sync relationships,
   * and bundleRootGraph to store the minimal availability through `parallel` and `async` relationships.
   * The two graphs, are used to build up ancestorAssets, a structure which holds all availability by
   * all means for each asset.
   */
  let rootNodeId = bundleRootGraph.addNode(-1);
  bundleRootGraph.setRootNodeId(rootNodeId);
  for (let [root] of bundleRoots) {
    let nodeId = bundleRootGraph.addNode((0, _nullthrows().default)(assetToIndex.get(root)));
    assetToBundleRootNodeId.set(root, nodeId);
    if (entries.has(root)) {
      bundleRootGraph.addEdge(rootNodeId, nodeId);
    }
  }

  // reachableRoots is an array of bit sets for each asset. Each bit set
  // indicates which bundle roots are reachable from that asset synchronously.
  let reachableRoots = [];
  for (let i = 0; i < assets.length; i++) {
    reachableRoots.push(new (_graph().BitSet)(bundleRootGraph.nodes.length));
  }

  // reachableAssets is the inverse mapping of reachableRoots. For each bundle root,
  // it contains a bit set that indicates which assets are reachable from it.
  let reachableAssets = [];

  // ancestorAssets maps bundle roots to the set of all assets available to it at runtime,
  // including in earlier parallel bundles. These are intersected through all paths to
  // the bundle to ensure that the available assets are always present no matter in which
  // order the bundles are loaded.
  let ancestorAssets = [];
  let inlineConstantDeps = new (_utils().DefaultMap)(() => new Set());
  for (let [bundleRootId, assetId] of bundleRootGraph.nodes.entries()) {
    let reachable = new (_graph().BitSet)(assets.length);
    reachableAssets.push(reachable);
    ancestorAssets.push(null);
    if (bundleRootId == rootNodeId || assetId == null) continue;
    // Add sync relationships to ReachableRoots
    let root = assets[assetId];
    assetGraph.traverse((node, _, actions) => {
      if (node.value === root) {
        return;
      }
      if (node.type === 'dependency') {
        let dependency = node.value;
        if (dependency.priority !== 'sync' && dependencyBundleGraph.hasContentKey(dependency.id)) {
          let assets = assetGraph.getDependencyAssets(dependency);
          if (assets.length === 0) {
            return;
          }
          (0, _assert().default)(assets.length === 1);
          let bundleRoot = assets[0];
          let bundle = (0, _nullthrows().default)(bundleGraph.getNode((0, _nullthrows().default)(bundles.get(bundleRoot.id))));
          if (bundle !== 'root' && bundle.bundleBehavior == null && !bundle.env.isIsolated() && bundle.env.context === root.env.context) {
            bundleRootGraph.addEdge(bundleRootId, (0, _nullthrows().default)(assetToBundleRootNodeId.get(bundleRoot)), dependency.priority === 'parallel' ? bundleRootEdgeTypes.parallel : bundleRootEdgeTypes.lazy);
          }
        }
        if (dependency.priority !== 'sync') {
          actions.skipChildren();
        }
        return;
      }
      //asset node type
      let asset = node.value;
      if (asset.bundleBehavior != null) {
        actions.skipChildren();
        return;
      }
      let assetIndex = (0, _nullthrows().default)(assetToIndex.get(node.value));
      reachable.add(assetIndex);
      reachableRoots[assetIndex].add(bundleRootId);
      if (asset.meta.isConstantModule === true) {
        let parents = assetGraph.getIncomingDependencies(asset).map(dep => (0, _nullthrows().default)(assetGraph.getAssetWithDependency(dep)));
        for (let parent of parents) {
          inlineConstantDeps.get(parent).add(asset);
        }
      }
      return;
    }, root, {
      skipUnusedDependencies: true
    });
  }
  for (let entry of entries.keys()) {
    // Initialize an empty set of ancestors available to entries
    let entryId = (0, _nullthrows().default)(assetToBundleRootNodeId.get(entry));
    ancestorAssets[entryId] = new (_graph().BitSet)(assets.length);
  }

  // Step Determine Availability
  // Visit nodes in a topological order, visiting parent nodes before child nodes.

  // This allows us to construct an understanding of which assets will already be
  // loaded and available when a bundle runs, by pushing available assets downwards and
  // computing the intersection of assets available through all possible paths to a bundle.
  // We call this structure ancestorAssets, a Map that tracks a bundleRoot,
  // to all assets available to it (meaning they will exist guaranteed when the bundleRoot is loaded)
  //  The topological sort ensures all parents are visited before the node we want to process.
  for (let nodeId of bundleRootGraph.topoSort(_graph().ALL_EDGE_TYPES)) {
    if (nodeId === rootNodeId) continue;
    const bundleRoot = assets[(0, _nullthrows().default)(bundleRootGraph.getNode(nodeId))];
    let bundleGroupId = (0, _nullthrows().default)(bundleRoots.get(bundleRoot))[1];

    // At a BundleRoot, we access it's available assets (via ancestorAssets),
    // and add to that all assets within the bundles in that BundleGroup.

    // This set is available to all bundles in a particular bundleGroup because
    // bundleGroups are just bundles loaded at the same time. However it is
    // not true that a bundle's available assets = all assets of all the bundleGroups
    // it belongs to. It's the intersection of those sets.
    let available;
    if (bundleRoot.bundleBehavior === 'isolated') {
      available = new (_graph().BitSet)(assets.length);
    } else {
      available = (0, _nullthrows().default)(ancestorAssets[nodeId]).clone();
      for (let bundleIdInGroup of [bundleGroupId, ...bundleGraph.getNodeIdsConnectedFrom(bundleGroupId)]) {
        let bundleInGroup = (0, _nullthrows().default)(bundleGraph.getNode(bundleIdInGroup));
        (0, _assert().default)(bundleInGroup !== 'root');
        if (bundleInGroup.bundleBehavior != null) {
          continue;
        }
        for (let bundleRoot of bundleInGroup.assets) {
          // Assets directly connected to current bundleRoot
          available.add((0, _nullthrows().default)(assetToIndex.get(bundleRoot)));
          available.union(reachableAssets[(0, _nullthrows().default)(assetToBundleRootNodeId.get(bundleRoot))]);
        }
      }
    }

    //  Now that we have bundleGroup availability, we will propagate that down to all the children
    //  of this bundleGroup. For a child, we also must maintain parallel availability. If it has
    //  parallel siblings that come before it, those, too, are available to it. Add those parallel
    //  available assets to the set of available assets for this child as well.
    let children = bundleRootGraph.getNodeIdsConnectedFrom(nodeId, _graph().ALL_EDGE_TYPES);
    let parallelAvailability = new (_graph().BitSet)(assets.length);
    for (let childId of children) {
      let assetId = (0, _nullthrows().default)(bundleRootGraph.getNode(childId));
      let child = assets[assetId];
      let bundleBehavior = getBundleFromBundleRoot(child).bundleBehavior;
      if (bundleBehavior != null) {
        continue;
      }
      let isParallel = bundleRootGraph.hasEdge(nodeId, childId, bundleRootEdgeTypes.parallel);

      // Most of the time, a child will have many parent bundleGroups,
      // so the next time we peek at a child from another parent, we will
      // intersect the availability built there with the previously computed
      // availability. this ensures no matter which bundleGroup loads a particular bundle,
      // it will only assume availability of assets it has under any circumstance
      const childAvailableAssets = ancestorAssets[childId];
      let currentChildAvailable = isParallel ? _graph().BitSet.union(parallelAvailability, available) : available;
      if (childAvailableAssets != null) {
        childAvailableAssets.intersect(currentChildAvailable);
      } else {
        ancestorAssets[childId] = currentChildAvailable.clone();
      }
      if (isParallel) {
        parallelAvailability.union(reachableAssets[childId]);
        parallelAvailability.add(assetId); //The next sibling should have older sibling available via parallel
      }
    }
  }
  // Step Internalize async bundles - internalize Async bundles if and only if,
  // the bundle is synchronously available elsewhere.
  // We can query sync assets available via reachableRoots. If the parent has
  // the bundleRoot by reachableRoots AND ancestorAssets, internalize it.
  for (let [id, bundleRootId] of bundleRootGraph.nodes.entries()) {
    if (bundleRootId == null || id === rootNodeId) continue;
    let bundleRoot = assets[bundleRootId];
    if (manualAssetToConfig.has(bundleRoot)) {
      // We internalize for MSBs later, we should never delete MSBs
      continue;
    }
    let parentRoots = bundleRootGraph.getNodeIdsConnectedTo(id, _graph().ALL_EDGE_TYPES);
    let canDelete = getBundleFromBundleRoot(bundleRoot).bundleBehavior !== 'isolated';
    if (parentRoots.length === 0) continue;
    for (let parentId of parentRoots) {
      var _ancestorAssets$paren;
      if (parentId === rootNodeId) {
        // connected to root.
        canDelete = false;
        continue;
      }
      if (reachableAssets[parentId].has(bundleRootId) || (_ancestorAssets$paren = ancestorAssets[parentId]) !== null && _ancestorAssets$paren !== void 0 && _ancestorAssets$paren.has(bundleRootId)) {
        let parentAssetId = (0, _nullthrows().default)(bundleRootGraph.getNode(parentId));
        let parent = assets[parentAssetId];
        let parentBundle = bundleGraph.getNode((0, _nullthrows().default)(bundles.get(parent.id)));
        (0, _assert().default)(parentBundle != null && parentBundle !== 'root');
        if (!parentBundle.internalizedAssets) {
          parentBundle.internalizedAssets = new (_graph().BitSet)(assets.length);
        }
        parentBundle.internalizedAssets.add(bundleRootId);
      } else {
        canDelete = false;
      }
    }
    if (canDelete) {
      deleteBundle(bundleRoot);
    }
  }
  function assignInlineConstants(parentAsset, bundle) {
    for (let inlineConstant of inlineConstantDeps.get(parentAsset)) {
      if (!bundle.assets.has(inlineConstant)) {
        bundle.assets.add(inlineConstant);
        bundle.size += inlineConstant.stats.size;
      }
    }
  }

  // Step Insert Or Share: Place all assets into bundles or create shared bundles. Each asset
  // is placed into a single bundle based on the bundle entries it is reachable from.
  // This creates a maximally code split bundle graph with no duplication.
  let reachable = new (_graph().BitSet)(assets.length);
  let reachableNonEntries = new (_graph().BitSet)(assets.length);
  let reachableIntersection = new (_graph().BitSet)(assets.length);
  for (let i = 0; i < assets.length; i++) {
    let asset = assets[i];
    let manualSharedObject = manualAssetToConfig.get(asset);
    if (bundleRoots.has(asset) && inlineConstantDeps.get(asset).size > 0) {
      let entryBundleId = (0, _nullthrows().default)(bundleRoots.get(asset))[0];
      let entryBundle = (0, _nullthrows().default)(bundleGraph.getNode(entryBundleId));
      (0, _assert().default)(entryBundle !== 'root');
      assignInlineConstants(asset, entryBundle);
    }
    if (asset.meta.isConstantModule === true) {
      // Ignore constant modules as they are placed with their direct parents
      continue;
    }

    // Unreliable bundleRoot assets which need to pulled in by shared bundles or other means.
    // Filter out entries, since they can't have shared bundles.
    // Neither can non-splittable, isolated, or needing of stable name bundles.
    // Reserve those filtered out bundles since we add the asset back into them.
    reachableNonEntries.clear();
    reachableRoots[i].forEach(nodeId => {
      var _ancestorAssets$nodeI;
      let assetId = bundleRootGraph.getNode(nodeId);
      if (assetId == null) return; // deleted
      let a = assets[assetId];
      if (entries.has(a) || !a.isBundleSplittable || bundleRoots.get(a) && (getBundleFromBundleRoot(a).needsStableName || getBundleFromBundleRoot(a).bundleBehavior === 'isolated')) {
        // Add asset to non-splittable bundles.
        addAssetToBundleRoot(asset, a);
      } else if (!((_ancestorAssets$nodeI = ancestorAssets[nodeId]) !== null && _ancestorAssets$nodeI !== void 0 && _ancestorAssets$nodeI.has(i))) {
        // Filter out bundles from this asset's reachable array if
        // bundle does not contain the asset in its ancestry
        reachableNonEntries.add(assetId);
      }
    });
    reachable.bits.set(reachableNonEntries.bits);

    // If we encounter a "manual" asset, draw an edge from reachable to its MSB
    if (manualSharedObject && !reachable.empty()) {
      let bundle;
      let bundleId;
      let manualSharedBundleKey = manualSharedObject.name + ',' + asset.type;
      let sourceBundles = [];
      reachable.forEach(id => {
        sourceBundles.push((0, _nullthrows().default)(bundleRoots.get(assets[id]))[0]);
      });
      if (!manualSharedMap.has(manualSharedBundleKey)) {
        let firstSourceBundle = (0, _nullthrows().default)(bundleGraph.getNode(sourceBundles[0]));
        (0, _assert().default)(firstSourceBundle !== 'root');
        bundle = createBundle({
          uniqueKey: manualSharedBundleKey,
          target: firstSourceBundle.target,
          type: asset.type,
          env: firstSourceBundle.env,
          manualSharedBundle: manualSharedObject === null || manualSharedObject === void 0 ? void 0 : manualSharedObject.name
        });
        bundle.sourceBundles = new Set(sourceBundles);
        bundle.assets.add(asset);
        bundleId = bundleGraph.addNode(bundle);
        manualSharedMap.set(manualSharedBundleKey, bundleId);
      } else {
        bundleId = (0, _nullthrows().default)(manualSharedMap.get(manualSharedBundleKey));
        bundle = (0, _nullthrows().default)(bundleGraph.getNode(bundleId));
        (0, _assert().default)(bundle != null && bundle !== 'root', 'We tried to use the root incorrectly');
        if (!bundle.assets.has(asset)) {
          bundle.assets.add(asset);
          bundle.size += asset.stats.size;
        }
        for (let s of sourceBundles) {
          if (s != bundleId) {
            bundle.sourceBundles.add(s);
          }
        }
      }
      for (let sourceBundleId of sourceBundles) {
        if (bundleId !== sourceBundleId) {
          bundleGraph.addEdge(sourceBundleId, bundleId);
        }
      }
      dependencyBundleGraph.addNodeByContentKeyIfNeeded(String(bundleId), {
        value: bundle,
        type: 'bundle'
      });
      continue;
    }

    // Finally, filter out bundleRoots (bundles) from this assets
    // reachable if they are subgraphs, and reuse that subgraph bundle
    // by drawing an edge. Essentially, if two bundles within an asset's
    // reachable array, have an ancestor-subgraph relationship, draw that edge.
    // This allows for us to reuse a bundle instead of making a shared bundle if
    // a bundle represents the exact set of assets a set of bundles would share

    // if a bundle b is a subgraph of another bundle f, reuse it, drawing an edge between the two
    if (config.disableSharedBundles === false) {
      reachableNonEntries.forEach(candidateId => {
        let candidateSourceBundleRoot = assets[candidateId];
        let candidateSourceBundleId = (0, _nullthrows().default)(bundleRoots.get(candidateSourceBundleRoot))[0];
        if (candidateSourceBundleRoot.env.isIsolated()) {
          return;
        }
        let reuseableBundleId = bundles.get(asset.id);
        if (reuseableBundleId != null) {
          reachable.delete(candidateId);
          bundleGraph.addEdge(candidateSourceBundleId, reuseableBundleId);
          let reusableBundle = bundleGraph.getNode(reuseableBundleId);
          (0, _assert().default)(reusableBundle !== 'root' && reusableBundle != null);
          reusableBundle.sourceBundles.add(candidateSourceBundleId);
        } else {
          // Asset is not a bundleRoot, but if its ancestor bundle (in the asset's reachable) can be
          // reused as a subgraph of another bundleRoot in its reachable, reuse it
          reachableIntersection.bits.set(reachableNonEntries.bits);
          reachableIntersection.intersect(reachableAssets[(0, _nullthrows().default)(assetToBundleRootNodeId.get(candidateSourceBundleRoot))]);
          reachableIntersection.forEach(otherCandidateId => {
            let otherReuseCandidate = assets[otherCandidateId];
            if (candidateSourceBundleRoot === otherReuseCandidate) return;
            let reusableBundleId = (0, _nullthrows().default)(bundles.get(otherReuseCandidate.id));
            reachable.delete(candidateId);
            bundleGraph.addEdge((0, _nullthrows().default)(bundles.get(candidateSourceBundleRoot.id)), reusableBundleId);
            let reusableBundle = bundleGraph.getNode(reusableBundleId);
            (0, _assert().default)(reusableBundle !== 'root' && reusableBundle != null);
            reusableBundle.sourceBundles.add(candidateSourceBundleId);
          });
        }
      });
    }
    let reachableArray = [];
    reachable.forEach(id => {
      reachableArray.push(assets[id]);
    });

    // Create shared bundles for splittable bundles.
    if (config.disableSharedBundles === false && reachableArray.length > config.minBundles) {
      let sourceBundles = reachableArray.map(a => (0, _nullthrows().default)(bundleRoots.get(a))[0]);
      let key = reachableArray.map(a => a.id).join(',') + '.' + asset.type;
      let bundleId = bundles.get(key);
      let bundle;
      if (bundleId == null) {
        let firstSourceBundle = (0, _nullthrows().default)(bundleGraph.getNode(sourceBundles[0]));
        (0, _assert().default)(firstSourceBundle !== 'root');
        bundle = createBundle({
          target: firstSourceBundle.target,
          type: asset.type,
          env: firstSourceBundle.env
        });
        bundle.sourceBundles = new Set(sourceBundles);
        let sharedInternalizedAssets = firstSourceBundle.internalizedAssets ? firstSourceBundle.internalizedAssets.clone() : new (_graph().BitSet)(assets.length);
        for (let p of sourceBundles) {
          let parentBundle = (0, _nullthrows().default)(bundleGraph.getNode(p));
          (0, _assert().default)(parentBundle !== 'root');
          if (parentBundle === firstSourceBundle) continue;
          if (parentBundle.internalizedAssets) {
            sharedInternalizedAssets.intersect(parentBundle.internalizedAssets);
          } else {
            sharedInternalizedAssets.clear();
          }
        }
        bundle.internalizedAssets = sharedInternalizedAssets;
        bundleId = bundleGraph.addNode(bundle);
        bundles.set(key, bundleId);
      } else {
        bundle = (0, _nullthrows().default)(bundleGraph.getNode(bundleId));
        (0, _assert().default)(bundle !== 'root');
      }
      bundle.assets.add(asset);
      bundle.size += asset.stats.size;
      assignInlineConstants(asset, bundle);
      for (let sourceBundleId of sourceBundles) {
        if (bundleId !== sourceBundleId) {
          bundleGraph.addEdge(sourceBundleId, bundleId);
        }
      }
      dependencyBundleGraph.addNodeByContentKeyIfNeeded(String(bundleId), {
        value: bundle,
        type: 'bundle'
      });
    } else if (config.disableSharedBundles === true || reachableArray.length <= config.minBundles) {
      for (let root of reachableArray) {
        addAssetToBundleRoot(asset, root);
      }
    }
  }
  let manualSharedBundleIds = new Set([...manualSharedMap.values()]);
  // Step split manual shared bundles for those that have the "split" property set
  let remainderMap = new (_utils().DefaultMap)(() => []);
  for (let id of manualSharedMap.values()) {
    let manualBundle = bundleGraph.getNode(id);
    (0, _assert().default)(manualBundle !== 'root' && manualBundle != null);
    if (manualBundle.sourceBundles.size > 0) {
      var _manualAssetToConfig$;
      let firstSourceBundle = (0, _nullthrows().default)(bundleGraph.getNode([...manualBundle.sourceBundles][0]));
      (0, _assert().default)(firstSourceBundle !== 'root');
      let firstAsset = [...manualBundle.assets][0];
      let manualSharedObject = manualAssetToConfig.get(firstAsset);
      (0, _assert().default)(manualSharedObject != null);
      let modNum = (_manualAssetToConfig$ = manualAssetToConfig.get(firstAsset)) === null || _manualAssetToConfig$ === void 0 ? void 0 : _manualAssetToConfig$.split;
      if (modNum != null) {
        for (let a of [...manualBundle.assets]) {
          let numRep = getBigIntFromContentKey(a.id);
          // $FlowFixMe Flow doesn't know about BigInt
          let r = Number(numRep % BigInt(modNum));
          remainderMap.get(r).push(a);
        }
        for (let i = 1; i < [...remainderMap.keys()].length; i++) {
          let bundle = createBundle({
            uniqueKey: manualSharedObject.name + firstSourceBundle.type + i,
            target: firstSourceBundle.target,
            type: firstSourceBundle.type,
            env: firstSourceBundle.env,
            manualSharedBundle: manualSharedObject.name
          });
          bundle.sourceBundles = manualBundle.sourceBundles;
          bundle.internalizedAssets = manualBundle.internalizedAssets;
          let bundleId = bundleGraph.addNode(bundle);
          manualSharedBundleIds.add(bundleId);
          for (let sourceBundleId of manualBundle.sourceBundles) {
            if (bundleId !== sourceBundleId) {
              bundleGraph.addEdge(sourceBundleId, bundleId);
            }
          }
          for (let sp of remainderMap.get(i)) {
            bundle.assets.add(sp);
            bundle.size += sp.stats.size;
            manualBundle.assets.delete(sp);
            manualBundle.size -= sp.stats.size;
          }
        }
      }
    }
  }

  // Step insert constant modules into manual shared bundles.
  // We have to do this separately as they're the only case where a single asset can
  // match multiple MSB's
  for (let [asset, msbs] of constantModuleToMSB.entries()) {
    for (let manualSharedObject of msbs) {
      let bundleId = manualSharedMap.get(manualSharedObject.name + ',js');
      if (bundleId == null) continue;
      let bundle = (0, _nullthrows().default)(bundleGraph.getNode(bundleId));
      (0, _assert().default)(bundle != null && bundle !== 'root', 'We tried to use the root incorrectly');
      if (!bundle.assets.has(asset)) {
        bundle.assets.add(asset);
        bundle.size += asset.stats.size;
      }
    }
  }

  // Step Merge Share Bundles: Merge any shared bundles under the minimum bundle size back into
  // their source bundles, and remove the bundle.
  // We should include "bundle reuse" as shared bundles that may be removed but the bundle itself would have to be retained
  for (let [bundleNodeId, bundle] of bundleGraph.nodes.entries()) {
    if (!bundle || bundle === 'root') continue;
    if (bundle.sourceBundles.size > 0 && bundle.mainEntryAsset == null && bundle.size < config.minBundleSize && !manualSharedBundleIds.has(bundleNodeId)) {
      removeBundle(bundleGraph, bundleNodeId, assetReference);
    }
  }
  let modifiedSourceBundles = new Set();

  // Step Remove Shared Bundles: Remove shared bundles from bundle groups that hit the parallel request limit.
  if (config.disableSharedBundles === false) {
    for (let bundleGroupId of bundleGraph.getNodeIdsConnectedFrom(rootNodeId)) {
      // Find shared bundles in this bundle group.
      let bundleId = bundleGroupId;

      // We should include "bundle reuse" as shared bundles that may be removed but the bundle itself would have to be retained
      let bundleIdsInGroup = getBundlesForBundleGroup(bundleId); //get all bundlegrups this bundle is an ancestor of

      // Filter out inline assests as they should not contribute to PRL
      let numBundlesContributingToPRL = bundleIdsInGroup.reduce((count, b) => {
        let bundle = (0, _nullthrows().default)(bundleGraph.getNode(b));
        (0, _assert().default)(bundle !== 'root');
        return count + (bundle.bundleBehavior !== 'inline');
      }, 0);
      if (numBundlesContributingToPRL > config.maxParallelRequests) {
        let sharedBundleIdsInBundleGroup = bundleIdsInGroup.filter(b => {
          let bundle = (0, _nullthrows().default)(bundleGraph.getNode(b));
          // shared bundles must have source bundles, we could have a bundle
          // connected to another bundle that isnt a shared bundle, so check
          return bundle !== 'root' && bundle.sourceBundles.size > 0 && bundleId != b && !manualSharedBundleIds.has(b);
        });

        // Sort the bundles so the smallest ones are removed first.
        let sharedBundlesInGroup = sharedBundleIdsInBundleGroup.map(id => ({
          id,
          bundle: (0, _nullthrows().default)(bundleGraph.getNode(id))
        })).map(({
          id,
          bundle
        }) => {
          // For Flow
          (0, _assert().default)(bundle !== 'root');
          return {
            id,
            bundle
          };
        }).sort((a, b) => b.bundle.size - a.bundle.size);

        // Remove bundles until the bundle group is within the parallel request limit.
        while (sharedBundlesInGroup.length > 0 && numBundlesContributingToPRL > config.maxParallelRequests) {
          let bundleTuple = sharedBundlesInGroup.pop();
          let bundleToRemove = bundleTuple.bundle;
          let bundleIdToRemove = bundleTuple.id;
          //TODO add integration test where bundles in bunlde group > max parallel request limit & only remove a couple shared bundles
          // but total # bundles still exceeds limit due to non shared bundles

          // Add all assets in the shared bundle into the source bundles that are within this bundle group.
          let sourceBundles = [...bundleToRemove.sourceBundles].filter(b => bundleIdsInGroup.includes(b));
          for (let sourceBundleId of sourceBundles) {
            let sourceBundle = (0, _nullthrows().default)(bundleGraph.getNode(sourceBundleId));
            (0, _assert().default)(sourceBundle !== 'root');
            modifiedSourceBundles.add(sourceBundle);
            bundleToRemove.sourceBundles.delete(sourceBundleId);
            for (let asset of bundleToRemove.assets) {
              addAssetToBundleRoot(asset, (0, _nullthrows().default)(sourceBundle.mainEntryAsset));
            }
            //This case is specific to reused bundles, which can have shared bundles attached to it
            for (let childId of bundleGraph.getNodeIdsConnectedFrom(bundleIdToRemove)) {
              let child = bundleGraph.getNode(childId);
              (0, _assert().default)(child !== 'root' && child != null);
              child.sourceBundles.add(sourceBundleId);
              bundleGraph.addEdge(sourceBundleId, childId);
            }
            // needs to add test case where shared bundle is removed from ONE bundlegroup but not from the whole graph!
            // Remove the edge from this bundle group to the shared bundle.
            // If there is now only a single bundle group that contains this bundle,
            // merge it into the remaining source bundles. If it is orphaned entirely, remove it.
            let incomingNodeCount = bundleGraph.getNodeIdsConnectedTo(bundleIdToRemove).length;
            if (incomingNodeCount <= 2 &&
            //Never fully remove reused bundles
            bundleToRemove.mainEntryAsset == null) {
              // If one bundle group removes a shared bundle, but the other *can* keep it, still remove because that shared bundle is pointless (only one source bundle)
              removeBundle(bundleGraph, bundleIdToRemove, assetReference);
              // Stop iterating through bundleToRemove's sourceBundles as the bundle has been removed.
              break;
            } else {
              bundleGraph.removeEdge(sourceBundleId, bundleIdToRemove);
            }
          }
          numBundlesContributingToPRL--;
        }
      }
    }
  }
  function getBigIntFromContentKey(contentKey) {
    let b = Buffer.alloc(64);
    b.write(contentKey);
    // $FlowFixMe Flow doesn't have BigInt types in this version
    return b.readBigInt64BE();
  }
  // Fix asset order in source bundles as they are likely now incorrect after shared bundle deletion
  if (modifiedSourceBundles.size > 0) {
    let assetOrderMap = new Map(assets.map((a, index) => [a, index]));
    for (let bundle of modifiedSourceBundles) {
      bundle.assets = new Set([...bundle.assets].sort((a, b) => {
        let aIndex = (0, _nullthrows().default)(assetOrderMap.get(a));
        let bIndex = (0, _nullthrows().default)(assetOrderMap.get(b));
        return aIndex - bIndex;
      }));
    }
  }
  function deleteBundle(bundleRoot) {
    bundleGraph.removeNode((0, _nullthrows().default)(bundles.get(bundleRoot.id)));
    bundleRoots.delete(bundleRoot);
    bundles.delete(bundleRoot.id);
    let bundleRootId = assetToBundleRootNodeId.get(bundleRoot);
    if (bundleRootId != null && bundleRootGraph.hasNode(bundleRootId)) {
      bundleRootGraph.removeNode(bundleRootId);
    }
  }
  function getBundlesForBundleGroup(bundleGroupId) {
    let bundlesInABundleGroup = [];
    bundleGraph.traverse(nodeId => {
      bundlesInABundleGroup.push(nodeId);
    }, bundleGroupId);
    return bundlesInABundleGroup;
  }
  function getBundleFromBundleRoot(bundleRoot) {
    let bundle = bundleGraph.getNode((0, _nullthrows().default)(bundleRoots.get(bundleRoot))[0]);
    (0, _assert().default)(bundle !== 'root' && bundle != null);
    return bundle;
  }
  function addAssetToBundleRoot(asset, bundleRoot) {
    let [bundleId, bundleGroupId] = (0, _nullthrows().default)(bundleRoots.get(bundleRoot));
    let bundle = (0, _nullthrows().default)(bundleGraph.getNode(bundleId));
    (0, _assert().default)(bundle !== 'root');
    if (asset.type !== bundle.type) {
      let bundleGroup = (0, _nullthrows().default)(bundleGraph.getNode(bundleGroupId));
      (0, _assert().default)(bundleGroup !== 'root');
      let key = (0, _nullthrows().default)(bundleGroup.mainEntryAsset).id + '.' + asset.type;
      let typeChangeBundleId = bundles.get(key);
      if (typeChangeBundleId == null) {
        let typeChangeBundle = createBundle({
          uniqueKey: key,
          needsStableName: bundle.needsStableName,
          bundleBehavior: bundle.bundleBehavior,
          type: asset.type,
          target: bundle.target,
          env: bundle.env
        });
        typeChangeBundleId = bundleGraph.addNode(typeChangeBundle);
        bundleGraph.addEdge(bundleId, typeChangeBundleId);
        bundles.set(key, typeChangeBundleId);
        bundle = typeChangeBundle;
      } else {
        bundle = (0, _nullthrows().default)(bundleGraph.getNode(typeChangeBundleId));
        (0, _assert().default)(bundle !== 'root');
      }
    }
    bundle.assets.add(asset);
    bundle.size += asset.stats.size;
    assignInlineConstants(asset, bundle);
  }
  function removeBundle(bundleGraph, bundleId, assetReference) {
    let bundle = (0, _nullthrows().default)(bundleGraph.getNode(bundleId));
    (0, _assert().default)(bundle !== 'root');
    for (let asset of bundle.assets) {
      assetReference.set(asset, assetReference.get(asset).filter(t => !t.includes(bundle)));
      for (let sourceBundleId of bundle.sourceBundles) {
        let sourceBundle = (0, _nullthrows().default)(bundleGraph.getNode(sourceBundleId));
        (0, _assert().default)(sourceBundle !== 'root');
        addAssetToBundleRoot(asset, (0, _nullthrows().default)(sourceBundle.mainEntryAsset));
      }
    }
    bundleGraph.removeNode(bundleId);
  }
  return {
    assets,
    bundleGraph,
    dependencyBundleGraph,
    bundleGroupBundleIds,
    assetReference,
    manualAssetToBundle
  };
}
const CONFIG_SCHEMA = {
  type: 'object',
  properties: {
    http: {
      type: 'number',
      enum: Object.keys(HTTP_OPTIONS).map(k => Number(k))
    },
    manualSharedBundles: {
      type: 'array',
      items: {
        type: 'object',
        properties: {
          name: {
            type: 'string'
          },
          assets: {
            type: 'array',
            items: {
              type: 'string'
            }
          },
          types: {
            type: 'array',
            items: {
              type: 'string'
            }
          },
          root: {
            type: 'string'
          },
          split: {
            type: 'number'
          }
        },
        required: ['name', 'assets'],
        additionalProperties: false
      }
    },
    minBundles: {
      type: 'number'
    },
    minBundleSize: {
      type: 'number'
    },
    maxParallelRequests: {
      type: 'number'
    },
    disableSharedBundles: {
      type: 'boolean'
    }
  },
  additionalProperties: false
};
function createBundle(opts) {
  var _opts$type, _opts$env, _opts$bundleBehavior;
  if (opts.asset == null) {
    return {
      uniqueKey: opts.uniqueKey,
      assets: new Set(),
      mainEntryAsset: null,
      size: 0,
      sourceBundles: new Set(),
      target: opts.target,
      type: (0, _nullthrows().default)(opts.type),
      env: (0, _nullthrows().default)(opts.env),
      needsStableName: Boolean(opts.needsStableName),
      bundleBehavior: opts.bundleBehavior,
      manualSharedBundle: opts.manualSharedBundle
    };
  }
  let asset = (0, _nullthrows().default)(opts.asset);
  return {
    uniqueKey: opts.uniqueKey,
    assets: new Set([asset]),
    mainEntryAsset: asset,
    size: asset.stats.size,
    sourceBundles: new Set(),
    target: opts.target,
    type: (_opts$type = opts.type) !== null && _opts$type !== void 0 ? _opts$type : asset.type,
    env: (_opts$env = opts.env) !== null && _opts$env !== void 0 ? _opts$env : asset.env,
    needsStableName: Boolean(opts.needsStableName),
    bundleBehavior: (_opts$bundleBehavior = opts.bundleBehavior) !== null && _opts$bundleBehavior !== void 0 ? _opts$bundleBehavior : asset.bundleBehavior,
    manualSharedBundle: opts.manualSharedBundle
  };
}
function resolveModeConfig(config, mode) {
  let generalConfig = {};
  let modeConfig = {};
  for (const key of Object.keys(config)) {
    if (key === 'development' || key === 'production') {
      if (key === mode) {
        modeConfig = config[key];
      }
    } else {
      generalConfig[key] = config[key];
    }
  }

  // $FlowFixMe Not sure how to convince flow here...
  return {
    ...generalConfig,
    ...modeConfig
  };
}
async function loadBundlerConfig(config, options, logger) {
  var _modeConfig$http, _modeConfig$minBundle, _modeConfig$minBundle2, _modeConfig$maxParall, _modeConfig$disableSh, _modeConfig$manualSha;
  let conf = await config.getConfig([], {
    packageKey: '@parcel/bundler-default'
  });
  if (!conf) {
    const modDefault = {
      ...HTTP_OPTIONS['2'],
      projectRoot: options.projectRoot
    };
    return modDefault;
  }
  (0, _assert().default)((conf === null || conf === void 0 ? void 0 : conf.contents) != null);
  let modeConfig = resolveModeConfig(conf.contents, options.mode);

  // minBundles will be ignored if shared bundles are disabled
  if (modeConfig.minBundles != null && modeConfig.disableSharedBundles === true) {
    logger.warn({
      origin: '@parcel/bundler-default',
      message: `The value of "${modeConfig.minBundles}" set for minBundles will not be used as shared bundles have been disabled`
    });
  }

  // minBundleSize will be ignored if shared bundles are disabled
  if (modeConfig.minBundleSize != null && modeConfig.disableSharedBundles === true) {
    logger.warn({
      origin: '@parcel/bundler-default',
      message: `The value of "${modeConfig.minBundleSize}" set for minBundleSize will not be used as shared bundles have been disabled`
    });
  }

  // maxParallelRequests will be ignored if shared bundles are disabled
  if (modeConfig.maxParallelRequests != null && modeConfig.disableSharedBundles === true) {
    logger.warn({
      origin: '@parcel/bundler-default',
      message: `The value of "${modeConfig.maxParallelRequests}" set for maxParallelRequests will not be used as shared bundles have been disabled`
    });
  }
  if (modeConfig.manualSharedBundles) {
    let nameArray = modeConfig.manualSharedBundles.map(a => a.name);
    let nameSet = new Set(nameArray);
    (0, _assert().default)(nameSet.size == nameArray.length, 'The name field must be unique for property manualSharedBundles');
  }
  _utils().validateSchema.diagnostic(CONFIG_SCHEMA, {
    data: modeConfig,
    source: await options.inputFS.readFile(conf.filePath, 'utf8'),
    filePath: conf.filePath,
    prependKey: `/${(0, _diagnostic().encodeJSONKeyComponent)('@parcel/bundler-default')}`
  }, '@parcel/bundler-default', 'Invalid config for @parcel/bundler-default');
  let http = (_modeConfig$http = modeConfig.http) !== null && _modeConfig$http !== void 0 ? _modeConfig$http : 2;
  let defaults = HTTP_OPTIONS[http];
  return {
    minBundles: (_modeConfig$minBundle = modeConfig.minBundles) !== null && _modeConfig$minBundle !== void 0 ? _modeConfig$minBundle : defaults.minBundles,
    minBundleSize: (_modeConfig$minBundle2 = modeConfig.minBundleSize) !== null && _modeConfig$minBundle2 !== void 0 ? _modeConfig$minBundle2 : defaults.minBundleSize,
    maxParallelRequests: (_modeConfig$maxParall = modeConfig.maxParallelRequests) !== null && _modeConfig$maxParall !== void 0 ? _modeConfig$maxParall : defaults.maxParallelRequests,
    projectRoot: options.projectRoot,
    disableSharedBundles: (_modeConfig$disableSh = modeConfig.disableSharedBundles) !== null && _modeConfig$disableSh !== void 0 ? _modeConfig$disableSh : defaults.disableSharedBundles,
    manualSharedBundles: (_modeConfig$manualSha = modeConfig.manualSharedBundles) !== null && _modeConfig$manualSha !== void 0 ? _modeConfig$manualSha : defaults.manualSharedBundles
  };
}
function getEntryByTarget(bundleGraph) {
  // Find entries from assetGraph per target
  let targets = new (_utils().DefaultMap)(() => new Map());
  bundleGraph.traverse({
    enter(node, context, actions) {
      if (node.type !== 'asset') {
        return node;
      }
      (0, _assert().default)(context != null && context.type === 'dependency' && context.value.isEntry && context.value.target != null);
      targets.get(context.value.target.distDir).set(node.value, context.value);
      actions.skipChildren();
      return node;
    }
  });
  return targets;
}