fix ts error

src/classes/accounts/amber-account.ts

@@ -3,7 +3,14 @@ import { Account } from "./account";
 
 export default class AmberAccount extends Account {
   readonly type = "amber";
-  signer: AmberSigner;
+
+  protected declare _signer?: AmberSigner | undefined;
+  public get signer(): AmberSigner | undefined {
+    return this._signer;
+  }
+  public set signer(value: AmberSigner | undefined) {
+    this._signer = value;
+  }
 
   constructor(pubkey: string) {
     super(pubkey);

src/classes/accounts/nostr-connect-account.ts

@@ -5,7 +5,14 @@ import { Account } from "./account";
 
 export default class NostrConnectAccount extends Account {
   readonly type = "nostr-connect";
-  signer: NostrConnectSigner;
+
+  protected declare _signer: NostrConnectSigner;
+  public get signer(): NostrConnectSigner {
+    return this._signer;
+  }
+  public set signer(value: NostrConnectSigner) {
+    this._signer = value;
+  }
 
   constructor(pubkey: string, signer?: NostrConnectSigner) {
     super(pubkey);

src/classes/accounts/password-account.ts

@@ -3,7 +3,14 @@ import { Account } from "./account";
 
 export default class PasswordAccount extends Account {
   readonly type = "local";
-  declare signer: PasswordSigner;
+
+  protected declare _signer: PasswordSigner;
+  public get signer(): PasswordSigner {
+    return this._signer;
+  }
+  public set signer(value: PasswordSigner) {
+    this._signer = value;
+  }
 
   constructor(pubkey: string) {
     super(pubkey);

src/classes/accounts/serial-port-account.ts

@@ -3,7 +3,13 @@ import { Account } from "./account";
 
 export default class SerialPortAccount extends Account {
   readonly type = "serial";
-  signer: SerialPortSigner;
+  protected declare _signer: SerialPortSigner;
+  public get signer(): SerialPortSigner {
+    return this._signer;
+  }
+  public set signer(value: SerialPortSigner) {
+    this._signer = value;
+  }
 
   constructor(pubkey: string) {
     super(pubkey);