Make singleton

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@mifi/breakerbox-db",
-  "version": "1.0.0",
+  "version": "1.0.3",
   "author": "mifi (Mike Fitzpatrick)",
   "license": "MIT",
   "scripts": {

src/index.ts

@@ -8,15 +8,22 @@ import { Fuses, Panel } from './types/Panel';
 import { ValidValues } from './types/ValidValues';
 import { SettingsMeta } from './types/SettingsMeta';
 
+interface BreakerboxProps {
+    filename?: string;
+    path?: string;
+    defaultStore?: Panel;
+    storageType: 'json' | 'yaml';
+}
 export class Breakerbox {
+    private static instance: Breakerbox;
     protected db;
     public static defaultStore = { fuses: {} as Fuses } as Panel;
 
     constructor(
-        filename = 'settings.json',
+        filename: BreakerboxProps['filename'] = 'settings.json',
-        path = fileURLToPath(import.meta.url),
+        path: BreakerboxProps['path'] = fileURLToPath(import.meta.url),
-        defaultStore = Breakerbox.defaultStore,
+        defaultStore: BreakerboxProps['defaultStore'] = Breakerbox.defaultStore,
-        storageType: 'json' | 'yaml' = 'json',
+        storageType: BreakerboxProps['storageType'] = 'json',
     ) {
         const __dirname = dirname(path);
         const file = join(__dirname, filename);
@@ -39,18 +46,25 @@ export class Breakerbox {
         return this.db.data.fuses;
     }
 
-    public getValue(key: string, defaultValue?: ValidValues, insert = false) {
+    public static getInstance(props = {} as BreakerboxProps) {
+        if (!Breakerbox.instance) {
+            Breakerbox.instance = new Breakerbox(props.filename, props.path, props.defaultStore, props.storageType);
+        }
+        return Breakerbox.instance;
+    }
+
+    public getValue<T = ValidValues>(key: string, defaultValue?: T, insert = false) {
         const fuse = this.get(key);
 
         if (fuse) {
-            return fuse.value;
+            return fuse.value as T;
         }
 
         if (insert && defaultValue) {
             this.set(key, defaultValue);
         }
 
-        return defaultValue;
+        return defaultValue as T;
     }
 
     public async set(key: string, value: ValidValues, meta = { type: typeof value }) {