[core] Expose dbPromise in StateStore

spec/state-store-spec.js

@@ -50,6 +50,12 @@ describe('StateStore', () => {
         });
     });
 
+    it('returns a database instance via dbPromise', async () => {
+      const store = new StateStore(databaseName, version);
+      const instance = await store.dbPromise;
+      expect(instance instanceof IDBDatabase).toBe(true);
+    });
+
     describe('when there is an error reading from the database', () => {
       it('rejects the promise returned by load', () => {
         const store = new StateStore(databaseName, version);
@@ -119,5 +125,12 @@ describe('StateStore', () => {
           expect(count).toBe(0);
         });
     });
+
+    it('returns a database instance via dbPromise', async () => {
+      const store = new StateStore(databaseName, version);
+      const instance = await store.dbPromise;
+      const Database = require("better-sqlite3");
+      expect(instance instanceof Database).toBe(true);
+    });
   });
 });

src/state-store.js

@@ -44,6 +44,11 @@ module.exports = class StateStore {
     return this._getCorrectImplementation().then(i => i.count());
   }
 
+  get dbPromise() {
+    // Exposed due to usage in [`project-plus`](https://web.pulsar-edit.dev/packages/project-plus)
+    return this._getCorrectImplementation().then(i => i.dbPromise);
+  }
+
   _getCorrectImplementation() {
     return awaitForAtomGlobal().then(() => {
       if(atom.config.get('core.useLegacySessionStore')) {