[cherry-picked from 2.x.x] change signature in typings for loadDatabase

CHANGELOG.md

@@ -57,6 +57,12 @@ to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 - The option for passing `options.nodeWebkitAppName` to the Datastore and the Persistence constructors has been removed, subsequently, the static method `Persistence.getNWAppFilename` has been removed as well;
 - Compatibility with node < 10.1.0 (we use `fs.promises`).
 
+## Fixed 
+- \[cherry picked from 2.2.2\] [#21](https://github.com/seald/nedb/issues/21) Typings for loadDatabase now support a callback.
+
+## [2.2.2] - 2022-03-10
+### Fixed
+- [#21](https://github.com/seald/nedb/issues/21) Typings for loadDatabase now support a callback.
 
 ## [2.2.1] - 2022-01-18
 ### Changed

index.d.ts

@@ -20,7 +20,7 @@ declare class Nedb<G = any> extends EventEmitter {
 
   autoloadPromise: Promise<void>|null;
 
-  loadDatabase(): void;
+  loadDatabase(callback?: (err: Error | null) => void): void;
 
   loadDatabaseAsync(): Promise<void>;
 

typings-tests.ts

@@ -16,6 +16,12 @@ let db = new Datastore()
 db = new Datastore({ filename: 'path/to/datafile' })
 db.loadDatabase()
 
+// Type 2 bis: Persistent datastore with manual loading with a callback
+db = new Datastore({ filename: 'path/to/datafile' })
+db.loadDatabase((err: Error | null) => {
+  // should not fail
+})
+
 // Type 3: Persistent datastore with automatic loading
 db = new Datastore({ filename: 'path/to/datafile_2', autoload: true })
 // You can issue commands right away