diff --git a/packages/idb-bridge/src/backend-interface.ts b/packages/idb-bridge/src/backend-interface.ts
index a9e3e960e..14b5da64a 100644
--- a/packages/idb-bridge/src/backend-interface.ts
+++ b/packages/idb-bridge/src/backend-interface.ts
@@ -17,7 +17,6 @@
 import { BridgeIDBDatabaseInfo, BridgeIDBKeyRange } from "./bridge-idb";
 import {
   IDBCursorDirection,
-  IDBKeyPath,
   IDBTransactionMode,
   IDBValidKey,
 } from "./idbtypes";
diff --git a/packages/idb-bridge/src/bridge-idb.ts b/packages/idb-bridge/src/bridge-idb.ts
index ce09fcb8e..c4c589790 100644
--- a/packages/idb-bridge/src/bridge-idb.ts
+++ b/packages/idb-bridge/src/bridge-idb.ts
@@ -61,7 +61,11 @@ import FakeEventTarget from "./util/FakeEventTarget";
 import { normalizeKeyPath } from "./util/normalizeKeyPath";
 import openPromise from "./util/openPromise";
 import queueTask from "./util/queueTask";
-import { structuredClone, structuredEncapsulate, structuredRevive } from "./util/structuredClone";
+import {
+  structuredClone,
+  structuredEncapsulate,
+  structuredRevive,
+} from "./util/structuredClone";
 import validateKeyPath from "./util/validateKeyPath";
 import valueToKey from "./util/valueToKey";
 
@@ -266,7 +270,7 @@ export class BridgeIDBCursor implements IDBCursor {
 
     const transaction = this._effectiveObjectStore._transaction;
 
-    if (transaction._state !== "active") {
+    if (!transaction._active) {
       throw new TransactionInactiveError();
     }
 
@@ -322,7 +326,7 @@ export class BridgeIDBCursor implements IDBCursor {
   public continue(key?: IDBValidKey) {
     const transaction = this._effectiveObjectStore._transaction;
 
-    if (transaction._state !== "active") {
+    if (!transaction._active) {
       throw new TransactionInactiveError();
     }
 
@@ -384,7 +388,7 @@ export class BridgeIDBCursor implements IDBCursor {
   public delete() {
     const transaction = this._effectiveObjectStore._transaction;
 
-    if (transaction._state !== "active") {
+    if (!transaction._active) {
       throw new TransactionInactiveError();
     }
 
@@ -455,7 +459,7 @@ export class BridgeIDBCursorWithValue extends BridgeIDBCursor {
  * Ensure that an active version change transaction is currently running.
  */
 const confirmActiveVersionchangeTransaction = (database: BridgeIDBDatabase) => {
-  if (!database._runningVersionchangeTransaction) {
+  if (!database._upgradeTransaction) {
     throw new InvalidStateError();
   }
 
@@ -467,11 +471,11 @@ const confirmActiveVersionchangeTransaction = (database: BridgeIDBDatabase) => {
   );
   const transaction = transactions[transactions.length - 1];
 
-  if (!transaction || transaction._state === "finished") {
+  if (!transaction || transaction._finished) {
     throw new InvalidStateError();
   }
 
-  if (transaction._state !== "active") {
+  if (!transaction._active) {
     throw new TransactionInactiveError();
   }
 
@@ -480,12 +484,13 @@ const confirmActiveVersionchangeTransaction = (database: BridgeIDBDatabase) => {
 
 // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#database-interface
 /** @public */
-export class BridgeIDBDatabase extends FakeEventTarget {
+export class BridgeIDBDatabase extends FakeEventTarget implements IDBDatabase {
   _closePending = false;
   _closed = false;
-  _runningVersionchangeTransaction = false;
   _transactions: Array<BridgeIDBTransaction> = [];
 
+  _upgradeTransaction: BridgeIDBTransaction | null = null;
+
   _backendConnection: DatabaseConnection;
   _backend: Backend;
 
@@ -499,8 +504,10 @@ export class BridgeIDBDatabase extends FakeEventTarget {
     return this._schema.databaseVersion;
   }
 
-  get objectStoreNames(): FakeDOMStringList {
-    return fakeDOMStringList(Object.keys(this._schema.objectStores)).sort();
+  get objectStoreNames(): DOMStringList {
+    return fakeDOMStringList(
+      Object.keys(this._schema.objectStores),
+    ).sort() as DOMStringList;
   }
 
   /**
@@ -509,9 +516,11 @@ export class BridgeIDBDatabase extends FakeEventTarget {
   _closeConnection() {
     this._closePending = true;
 
+    // Spec is unclear what "complete" means, we assume it's
+    // the same as "finished".
     const transactionsComplete = this._transactions.every(
       (transaction: BridgeIDBTransaction) => {
-        return transaction._state === "finished";
+        return transaction._finished;
       },
     );
 
@@ -525,6 +534,13 @@ export class BridgeIDBDatabase extends FakeEventTarget {
     }
   }
 
+  /**
+   * Refresh the schema by querying it from the backend.
+   */
+  _refreshSchema() {
+    this._schema = this._backend.getSchema(this._backendConnection);
+  }
+
   constructor(backend: Backend, backendConnection: DatabaseConnection) {
     super();
 
@@ -537,7 +553,10 @@ export class BridgeIDBDatabase extends FakeEventTarget {
   // http://w3c.github.io/IndexedDB/#dom-idbdatabase-createobjectstore
   public createObjectStore(
     name: string,
-    options: { autoIncrement?: boolean; keyPath?: IDBKeyPath } | null = {},
+    options: {
+      autoIncrement?: boolean;
+      keyPath?: null | IDBKeyPath | IDBKeyPath[];
+    } | null = {},
   ): BridgeIDBObjectStore {
     if (name === undefined) {
       throw new TypeError();
@@ -572,7 +591,7 @@ export class BridgeIDBDatabase extends FakeEventTarget {
     transaction._backend.createObjectStore(
       backendTx,
       name,
-      (keyPath !== null) ? normalizeKeyPath(keyPath) : null,
+      keyPath !== null ? normalizeKeyPath(keyPath) : null,
       autoIncrement,
     );
 
@@ -593,6 +612,7 @@ export class BridgeIDBDatabase extends FakeEventTarget {
     storeNames: string | string[],
     mode?: IDBTransactionMode,
     backendTransaction?: DatabaseTransaction,
+    openRequest?: BridgeIDBOpenDBRequest,
   ): BridgeIDBTransaction {
     mode = mode !== undefined ? mode : "readonly";
     if (
@@ -603,16 +623,7 @@ export class BridgeIDBDatabase extends FakeEventTarget {
       throw new TypeError("Invalid mode: " + mode);
     }
 
-    const hasActiveVersionchange = this._transactions.some(
-      (transaction: BridgeIDBTransaction) => {
-        return (
-          transaction._state === "active" &&
-          transaction.mode === "versionchange" &&
-          transaction._db === this
-        );
-      },
-    );
-    if (hasActiveVersionchange) {
+    if (this._upgradeTransaction) {
       throw new InvalidStateError();
     }
 
@@ -627,7 +638,7 @@ export class BridgeIDBDatabase extends FakeEventTarget {
       throw new InvalidAccessError();
     }
     for (const storeName of storeNames) {
-      if (this.objectStoreNames.indexOf(storeName) < 0) {
+      if (!this.objectStoreNames.contains(storeName)) {
         throw new NotFoundError(
           "No objectStore named " + storeName + " in this database",
         );
@@ -639,9 +650,12 @@ export class BridgeIDBDatabase extends FakeEventTarget {
       mode,
       this,
       backendTransaction,
+      openRequest,
     );
     this._transactions.push(tx);
     queueTask(() => tx._start());
+    // "When a transaction is created its active flag is initially set."
+    tx._active = true;
     return tx;
   }
 
@@ -809,20 +823,25 @@ export class BridgeIDBFactory {
           dbconn,
           requestedVersion,
         );
-        db._runningVersionchangeTransaction = true;
 
         const transaction = db._internalTransaction(
           [],
           "versionchange",
           backendTransaction,
+          request,
         );
+
+        db._upgradeTransaction = transaction;
+
         const event = new BridgeIDBVersionChangeEvent("upgradeneeded", {
           newVersion: version,
           oldVersion: existingVersion,
         });
 
-        request.result = db;
+        transaction._active = true;
+
         request.readyState = "done";
+        request.result = db;
         request.transaction = transaction;
         request.dispatchEvent(event);
 
@@ -832,15 +851,30 @@ export class BridgeIDBFactory {
 
         // We don't explicitly exit the versionchange transaction,
         // since this is already done by the BridgeIDBTransaction.
-        db._runningVersionchangeTransaction = false;
+        db._upgradeTransaction = null;
 
-        const event2 = new FakeEvent("success", {
-          bubbles: false,
-          cancelable: false,
-        });
-        event2.eventPath = [request];
+        // We re-use the same transaction (as per spec) here.
+        transaction._active = true;
+        if (transaction._aborted) {
+          request.result = undefined;
+          request.error = new AbortError();
+          request.readyState = "done";
+          const event2 = new FakeEvent("error", {
+            bubbles: false,
+            cancelable: false,
+          });
+          event2.eventPath = [request];
+          request.dispatchEvent(event2);
+        } else {
+          console.log(`dispatching success event, _active=${transaction._active}`);
+          const event2 = new FakeEvent("success", {
+            bubbles: false,
+            cancelable: false,
+          });
+          event2.eventPath = [request];
 
-        request.dispatchEvent(event2);
+          request.dispatchEvent(event2);
+        }
       }
 
       this.connections.push(db);
@@ -871,7 +905,7 @@ const confirmActiveTransaction = (
     throw new InvalidStateError();
   }
 
-  if (index._objectStore._transaction._state !== "active") {
+  if (!index._objectStore._transaction._active) {
     throw new TransactionInactiveError();
   }
 
@@ -931,11 +965,11 @@ export class BridgeIDBIndex implements IDBIndex {
   set name(name: any) {
     const transaction = this._objectStore._transaction;
 
-    if (!transaction._db._runningVersionchangeTransaction) {
+    if (!transaction._db._upgradeTransaction) {
       throw new InvalidStateError();
     }
 
-    if (transaction._state !== "active") {
+    if (!transaction._active) {
       throw new TransactionInactiveError();
     }
 
@@ -1282,7 +1316,7 @@ export class BridgeIDBObjectStore implements IDBObjectStore {
   get _indexNames(): FakeDOMStringList {
     return fakeDOMStringList(
       Object.keys(this._schema.objectStores[this._name].indexes),
-    ).sort()
+    ).sort();
   }
 
   get indexNames(): DOMStringList {
@@ -1330,7 +1364,7 @@ export class BridgeIDBObjectStore implements IDBObjectStore {
   set name(newName: any) {
     const transaction = this._transaction;
 
-    if (!transaction._db._runningVersionchangeTransaction) {
+    if (!transaction._db._upgradeTransaction) {
       throw new InvalidStateError();
     }
 
@@ -1581,7 +1615,7 @@ export class BridgeIDBObjectStore implements IDBObjectStore {
       throw new TypeError();
     }
 
-    if (!this._transaction._db._runningVersionchangeTransaction) {
+    if (!this._transaction._db._upgradeTransaction) {
       throw new InvalidStateError();
     }
 
@@ -1628,7 +1662,7 @@ export class BridgeIDBObjectStore implements IDBObjectStore {
       throw new TypeError();
     }
 
-    if (this._transaction._state === "finished") {
+    if (this._transaction._finished) {
       throw new InvalidStateError();
     }
 
@@ -1649,7 +1683,7 @@ export class BridgeIDBObjectStore implements IDBObjectStore {
       throw new InvalidStateError();
     }
 
-    if (!this._transaction._db._runningVersionchangeTransaction) {
+    if (!this._transaction._db._upgradeTransaction) {
       throw new InvalidStateError();
     }
 
@@ -1755,6 +1789,7 @@ export class BridgeIDBRequest extends FakeEventTarget implements IDBRequest {
       cancelable: true,
     });
     event.eventPath = [];
+
     this.dispatchEvent(event);
   }
 
@@ -1791,24 +1826,41 @@ export class BridgeIDBOpenDBRequest
 export class BridgeIDBTransaction
   extends FakeEventTarget
   implements IDBTransaction {
-  public _state: "active" | "inactive" | "committing" | "finished" = "active";
-  public _started = false;
-  public _objectStoresCache: Map<string, BridgeIDBObjectStore> = new Map();
+  _committed: boolean = false;
+  /**
+   * A transaction is active as long as new operations can be
+   * placed against it.
+   */
+  _active: boolean = false;
+  _started: boolean = false;
+  _aborted: boolean = false;
+  _objectStoresCache: Map<string, BridgeIDBObjectStore> = new Map();
 
-  public _backendTransaction?: DatabaseTransaction;
+  /**
+   * https://www.w3.org/TR/IndexedDB-2/#transaction-lifetime-concept
+   *
+   * When a transaction is committed or aborted, it is said to be finished.
+   */
+  get _finished(): boolean {
+    return this._committed || this._aborted;
+  }
 
-  public _objectStoreNames: FakeDOMStringList;
+  _openRequest: BridgeIDBOpenDBRequest | null = null;
+
+  _backendTransaction?: DatabaseTransaction;
+
+  _objectStoreNames: FakeDOMStringList;
   get objectStoreNames(): DOMStringList {
     return this._objectStoreNames as DOMStringList;
   }
-  public mode: IDBTransactionMode;
-  public _db: BridgeIDBDatabase;
+  mode: IDBTransactionMode;
+  _db: BridgeIDBDatabase;
 
   get db(): IDBDatabase {
-    return this.db;
+    return this._db;
   }
 
-  public _error: Error | null = null;
+  _error: Error | null = null;
 
   get error(): DOMException {
     return this._error as DOMException;
@@ -1823,7 +1875,7 @@ export class BridgeIDBTransaction
 
   public _scope: Set<string>;
   private _requests: Array<{
-    operation: () => void;
+    operation: () => Promise<void>;
     request: BridgeIDBRequest;
   }> = [];
 
@@ -1836,6 +1888,7 @@ export class BridgeIDBTransaction
     mode: IDBTransactionMode,
     db: BridgeIDBDatabase,
     backendTransaction?: DatabaseTransaction,
+    openRequest?: BridgeIDBOpenDBRequest,
   ) {
     super();
 
@@ -1850,11 +1903,17 @@ export class BridgeIDBTransaction
     this._objectStoreNames = fakeDOMStringList(Array.from(this._scope).sort());
 
     this._db._transactions.push(this);
+
+    this._openRequest = openRequest ?? null;
   }
 
   // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-steps-for-aborting-a-transaction
   async _abort(errName: string | null) {
-    this._state = "finished";
+    if (BridgeIDBFactory.enableTracing) {
+      console.log("TRACE: aborting transaction");
+    }
+
+    this._aborted = true;
 
     if (errName !== null) {
       const e = new Error();
@@ -1862,30 +1921,45 @@ export class BridgeIDBTransaction
       this._error = e;
     }
 
+    if (BridgeIDBFactory.enableTracing) {
+      console.log(`TRACE: aborting ${this._requests.length} requests`);
+    }
+
     // Should this directly remove from _requests?
     for (const { request } of this._requests) {
+      console.log("ready state:", request.readyState);
       if (request.readyState !== "done") {
-        request.readyState = "done"; // This will cancel execution of this request's operation
-        if (request._source) {
-          request.result = undefined;
-          request.error = new AbortError();
-
-          const event = new FakeEvent("error", {
-            bubbles: true,
-            cancelable: true,
-          });
-          event.eventPath = [this._db, this];
-          request.dispatchEvent(event);
+        // This will cancel execution of this request's operation
+        request.readyState = "done";
+        if (BridgeIDBFactory.enableTracing) {
+          console.log("dispatching error event");
         }
+        request.result = undefined;
+        request.error = new AbortError();
+
+        const event = new FakeEvent("error", {
+          bubbles: true,
+          cancelable: true,
+        });
+        event.eventPath = [request, this, this._db];
+        console.log("dispatching error event for request after abort");
+        request.dispatchEvent(event);
       }
     }
 
+    // ("abort a transaction", step 5.1)
+    if (this._openRequest) {
+      this._db._upgradeTransaction = null;
+    }
+
     // Only roll back if we actually executed the scheduled operations.
     const maybeBtx = this._backendTransaction;
     if (maybeBtx) {
       await this._backend.rollback(maybeBtx);
     }
 
+    this._db._refreshSchema();
+
     queueTask(() => {
       const event = new FakeEvent("abort", {
         bubbles: true,
@@ -1894,20 +1968,24 @@ export class BridgeIDBTransaction
       event.eventPath = [this._db];
       this.dispatchEvent(event);
     });
+
+    if (this._openRequest) {
+      this._openRequest.transaction = null;
+      this._openRequest.result = undefined;
+      this._openRequest.readyState = "pending";
+    }
   }
 
   public abort() {
-    if (this._state === "committing" || this._state === "finished") {
+    if (this._finished) {
       throw new InvalidStateError();
     }
-    this._state = "active";
-
     this._abort(null);
   }
 
   // http://w3c.github.io/IndexedDB/#dom-idbtransaction-objectstore
   public objectStore(name: string): BridgeIDBObjectStore {
-    if (this._state !== "active") {
+    if (!this._active) {
       throw new InvalidStateError();
     }
 
@@ -1925,7 +2003,7 @@ export class BridgeIDBTransaction
     const operation = obj.operation;
     let request = obj.hasOwnProperty("request") ? obj.request : null;
 
-    if (this._state !== "active") {
+    if (!this._active) {
       throw new TransactionInactiveError();
     }
 
@@ -2001,10 +2079,8 @@ export class BridgeIDBTransaction
           request.result = result;
           request.error = undefined;
 
-          // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-fire-a-success-event
-          if (this._state === "inactive") {
-            this._state = "active";
-          }
+          // https://www.w3.org/TR/IndexedDB-2/#fire-error-event
+          this._active = true;
           event = new FakeEvent("success", {
             bubbles: false,
             cancelable: false,
@@ -2014,9 +2090,11 @@ export class BridgeIDBTransaction
             event.eventPath = [request, this, this._db];
             request.dispatchEvent(event);
           } catch (err) {
-            if (this._state !== "committing") {
-              this._abort("AbortError");
+            if (BridgeIDBFactory.enableTracing) {
+              console.log("TRACING: caught error in transaction success event handler");
             }
+            this._abort("AbortError");
+            this._active = false;
             throw err;
           }
         } catch (err) {
@@ -2028,9 +2106,7 @@ export class BridgeIDBTransaction
           request.error = err;
 
           // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-fire-an-error-event
-          if (this._state === "inactive") {
-            this._state = "active";
-          }
+          this._active = true;
           event = new FakeEvent("error", {
             bubbles: true,
             cancelable: true,
@@ -2040,9 +2116,7 @@ export class BridgeIDBTransaction
             event.eventPath = [this._db, this];
             request.dispatchEvent(event);
           } catch (err) {
-            if (this._state !== "committing") {
-              this._abort("AbortError");
-            }
+            this._abort("AbortError");
             throw err;
           }
           if (!event.canceled) {
@@ -2061,17 +2135,13 @@ export class BridgeIDBTransaction
       return;
     }
 
-    if (this._state !== "finished" && this._state !== "committing") {
+    if (!this._finished && !this._committed) {
       if (BridgeIDBFactory.enableTracing) {
         console.log("finishing transaction");
       }
 
-      this._state = "committing";
-
       await this._backend.commit(this._backendTransaction);
-
-      this._state = "finished";
-
+      this._committed = true;
       if (!this._error) {
         if (BridgeIDBFactory.enableTracing) {
           console.log("dispatching 'complete' event on transaction");
@@ -2089,15 +2159,19 @@ export class BridgeIDBTransaction
 
       this._resolveWait();
     }
+    if (this._aborted) {
+      this._resolveWait();
+    }
   }
 
   public commit() {
-    if (this._state !== "active") {
+    // The current spec doesn't even have an explicit commit method.
+    // We still support it, effectively as a "no-operation" that
+    // prevents new operations from being scheduled.
+    if (!this._active) {
       throw new InvalidStateError();
     }
-
-    this._state = "committing";
-    // We now just wait for auto-commit ...
+    this._active = false;
   }
 
   public toString() {
diff --git a/packages/idb-bridge/src/idb-wpt-ported/abort-in-initial-upgradeneeded.test.ts b/packages/idb-bridge/src/idb-wpt-ported/abort-in-initial-upgradeneeded.test.ts
new file mode 100644
index 000000000..da9ed2632
--- /dev/null
+++ b/packages/idb-bridge/src/idb-wpt-ported/abort-in-initial-upgradeneeded.test.ts
@@ -0,0 +1,34 @@
+import test from "ava";
+import { createdb } from "./wptsupport";
+
+test("WPT test abort-in-initial-upgradeneeded.htm", async (t) => {
+  await new Promise<void>((resolve, reject) => {
+    var db: any;
+    var open_rq = createdb(t, undefined, 2);
+
+    open_rq.onupgradeneeded = function (e) {
+      const tgt = e.target as any;
+      db = tgt.result;
+      t.assert(db.version === 2);
+      var transaction = tgt.transaction;
+      transaction.oncomplete = () => t.fail("unexpected transaction.complete");
+      transaction.onabort = function (e: any) {
+        console.log(`version: ${e.target.db.version}`);
+        t.deepEqual(e.target.db.version, 0);
+      };
+      db.onabort = function () {};
+      transaction.abort();
+    };
+
+    open_rq.onerror = function (e) {
+      const tgt = e.target as any;
+      t.deepEqual(open_rq, e.target);
+      t.deepEqual(tgt.result, undefined);
+      t.deepEqual(tgt.error.name, "AbortError");
+      console.log(`version (onerror): ${db.version}`);
+      t.deepEqual(db.version, 0);
+      t.deepEqual(open_rq.transaction, null);
+      resolve();
+    };
+  });
+});
diff --git a/packages/idb-bridge/src/idb-wpt-ported/value.test.ts b/packages/idb-bridge/src/idb-wpt-ported/value.test.ts
index c4a8315c6..b1c2b3bee 100644
--- a/packages/idb-bridge/src/idb-wpt-ported/value.test.ts
+++ b/packages/idb-bridge/src/idb-wpt-ported/value.test.ts
@@ -24,23 +24,24 @@ test.cb("WPT test value.htm, array", (t) => {
 });
 
 test.cb("WPT test value.htm, date", (t) => {
-    const value = new Date();
-    const _instanceof = Date;
-  
-    t.plan(1);
-  
-    createdb(t).onupgradeneeded = function (e: IDBVersionChangeEvent) {
-      (e.target as any).result.createObjectStore("store").add(value, 1);
-      (e.target as any).onsuccess = (e: any) => {
-        console.log("in first onsuccess");
-        e.target.result
-          .transaction("store")
-          .objectStore("store")
-          .get(1).onsuccess = (e: any) => {
-          t.assert(e.target.result instanceof _instanceof, "instanceof");
-          t.end();
-        };
+  const value = new Date();
+  const _instanceof = Date;
+
+  t.plan(1);
+
+  createdb(t).onupgradeneeded = function (e: IDBVersionChangeEvent) {
+    (e.target as any).result.createObjectStore("store").add(value, 1);
+    (e.target as any).onsuccess = (e: any) => {
+      console.log("in first onsuccess");
+      e.target.result
+        .transaction("store")
+        .objectStore("store")
+        .get(1).onsuccess = (e: any) => {
+          console.log("target", e.target);
+          console.log("result", e.target.result);
+        t.assert(e.target.result instanceof _instanceof, "instanceof");
+        t.end();
       };
     };
-  });
-  
\ No newline at end of file
+  };
+});
diff --git a/packages/idb-bridge/src/idb-wpt-ported/wptsupport.ts b/packages/idb-bridge/src/idb-wpt-ported/wptsupport.ts
index 10c11b7a6..f7b065f23 100644
--- a/packages/idb-bridge/src/idb-wpt-ported/wptsupport.ts
+++ b/packages/idb-bridge/src/idb-wpt-ported/wptsupport.ts
@@ -23,8 +23,18 @@ export function createdb(
   return rq_open;
 }
 
-export function assert_key_equals(actual: any, expected: any, description?: string) {
+export function assert_key_equals(
+  actual: any,
+  expected: any,
+  description?: string,
+) {
   if (0 != compareKeys(actual, expected)) {
     throw Error("expected keys to be the same");
   }
 }
+
+export function assert_equals(actual: any, expected: any) {
+  if (actual !== expected) {
+    throw Error("assert_equals failed");
+  }
+}
diff --git a/packages/idb-bridge/src/util/FakeEventTarget.ts b/packages/idb-bridge/src/util/FakeEventTarget.ts
index d2f46c98f..95489b4ac 100644
--- a/packages/idb-bridge/src/util/FakeEventTarget.ts
+++ b/packages/idb-bridge/src/util/FakeEventTarget.ts
@@ -97,13 +97,14 @@ abstract class FakeEventTarget implements EventTarget {
   public readonly listeners: Listener[] = [];
 
   // These will be overridden in individual subclasses and made not readonly
-  public readonly onabort: EventListener | null | undefined;
-  public readonly onblocked: EventListener | null | undefined;
-  public readonly oncomplete: EventListener | null | undefined;
-  public readonly onerror: EventListener | null | undefined;
-  public readonly onsuccess: EventListener | null | undefined;
-  public readonly onupgradeneeded: EventListener | null | undefined;
-  public readonly onversionchange: EventListener | null | undefined;
+  public readonly onabort: EventListener | null = null;
+  public readonly onblocked: EventListener | null = null;
+  public readonly oncomplete: EventListener | null = null;
+  public readonly onerror: EventListener | null = null;
+  public readonly onsuccess: EventListener | null = null;
+  public readonly onclose: EventListener | null = null;
+  public readonly onupgradeneeded: EventListener | null = null;
+  public readonly onversionchange: EventListener | null = null;
 
   static enableTracing: boolean = false;
 
diff --git a/packages/idb-bridge/src/util/validateKeyPath.ts b/packages/idb-bridge/src/util/validateKeyPath.ts
index 8057172df..2beb3c468 100644
--- a/packages/idb-bridge/src/util/validateKeyPath.ts
+++ b/packages/idb-bridge/src/util/validateKeyPath.ts
@@ -17,7 +17,7 @@
 import { IDBKeyPath } from "../idbtypes";
 
 // http://www.w3.org/TR/2015/REC-IndexedDB-20150108/#dfn-valid-key-path
-const validateKeyPath = (keyPath: IDBKeyPath, parent?: "array" | "string") => {
+const validateKeyPath = (keyPath: IDBKeyPath | IDBKeyPath[], parent?: "array" | "string") => {
   // This doesn't make sense to me based on the spec, but it is needed to pass the W3C KeyPath tests (see same
   // comment in extractKey)
   let myKeyPath: IDBKeyPath | IDBKeyPath[] = keyPath;
diff --git a/packages/idb-bridge/tsconfig.json b/packages/idb-bridge/tsconfig.json
index 99c5e6e3c..4f730e1c5 100644
--- a/packages/idb-bridge/tsconfig.json
+++ b/packages/idb-bridge/tsconfig.json
@@ -5,6 +5,7 @@
         "module": "ESNext",
         "moduleResolution": "node",
         "target": "ES6",
+        "allowJs": true,
         "noImplicitAny": true,
         "outDir": "lib",
         "declaration": true,