fix: resolves bug where middleware was being mistakenly duplicated

src/configuration.ts

@@ -29,6 +29,10 @@ export class Configuration implements IConfiguration {
     this.glblCfg = globalThis.$adzeGlobal?.configuration;
   }
 
+  public updateConfiguration(cfg: UserConfiguration): void {
+    this.logCfg = cfg;
+  }
+
   public get activeLevel(): Level | number {
     return this.glblCfg?.activeLevel ?? this.logCfg.activeLevel ?? dfltCfg.activeLevel;
   }
@@ -147,20 +151,20 @@ export class Configuration implements IConfiguration {
 
   public exportValues(): UserConfiguration {
     return {
-      activeLevel: this.activeLevel,
-      cache: this.cache,
-      cacheSize: this.cacheSize,
-      dump: this.dump,
-      meta: this.meta,
-      silent: this.silent,
-      showTimestamp: this.showTimestamp,
-      withEmoji: this.withEmoji,
-      format: this.format,
-      levels: this.levels,
-      middleware: this.middleware,
-      filters: this.filters,
-      timestampFormatter: this.timestampFormatter,
-      formatters: this.formatters,
+      activeLevel: this.logCfg.activeLevel,
+      cache: this.logCfg.cache,
+      cacheSize: this.logCfg.cacheSize,
+      dump: this.logCfg.dump,
+      meta: this.logCfg.meta,
+      silent: this.logCfg.silent,
+      showTimestamp: this.logCfg.showTimestamp,
+      withEmoji: this.logCfg.withEmoji,
+      format: this.logCfg.format,
+      levels: this.logCfg.levels,
+      middleware: this.logCfg.middleware,
+      filters: this.logCfg.filters,
+      timestampFormatter: this.logCfg.timestampFormatter,
+      formatters: this.logCfg.formatters,
     };
   }
 }

src/log.ts

@@ -435,8 +435,8 @@ export default class Log<N extends string = string, Msg = unknown> {
    * sealed.log('Another log.'); // -> prints "#sealed [sealed-label] Another log."
    * ```
    */
-  public seal<N extends string = string, M = unknown>(cfg?: UserConfiguration) {
-    this._cfg = new Configuration({ ...this._cfg.exportValues(), ...cfg });
+  public seal<N extends string = string, M = unknown>(_cfg?: UserConfiguration) {
+    if (_cfg) this._cfg.updateConfiguration(_cfg);
     return SealedLog<N, M>(Log<N, M>, this._cfg, this.modifierData, this.modifierQueue);
   }
 

test/seal.test.ts

@@ -1,5 +1,6 @@
 import { afterEach, describe, expect, test, vi } from 'vitest';
-import adze, { teardown } from '../src';
+import adze, { Middleware, setup, teardown } from '../src';
+import Log from '../src/log';
 
 /**
  * @vitest-environment happy-dom
@@ -28,4 +29,24 @@ describe('Configuration', () => {
       'This is a log from a twice sealed logger.'
     );
   });
+
+  test('the same number of middlewares are inherited after sealing', () => {
+    console.log = vi.fn();
+
+    const store = setup({
+      middleware: [{} as Middleware],
+    });
+
+    store.addListener('*', (log: Log) => {
+      expect(log.configuration.middleware?.length).toBe(2);
+    });
+
+    const logger1 = adze.ns('l1').seal();
+    const logger2 = logger1.ns('l2').seal({
+      middleware: [{} as Middleware],
+    });
+    const logger3 = logger2.ns('l3').seal();
+
+    logger3.log('This is a log from a sealed logger.');
+  });
 });