fix(exports): stabilize published types and compatibility with updated dependencies

ts/skr.classes.chartofaccounts.ts

@@ -262,6 +262,9 @@ export class ChartOfAccounts {
    * Search accounts
    */
   public async searchAccounts(searchTerm: string): Promise<Account[]> {
+    if (!this.skrType) {
+      throw new Error('SKR type not set. Initialize SKR03 or SKR04 first.');
+    }
     return await Account.searchAccounts(searchTerm, this.skrType);
   }
 
@@ -287,10 +290,11 @@ export class ChartOfAccounts {
 
     // Apply text search if provided
     if (filter?.searchTerm) {
-      const lowerSearchTerm = filter.searchTerm.toLowerCase();
+      const searchTerm = filter.searchTerm;
+      const lowerSearchTerm = searchTerm.toLowerCase();
       return accounts.filter(
         (account) =>
-          account.accountNumber.includes(filter.searchTerm) ||
+          account.accountNumber.includes(searchTerm) ||
           account.accountName.toLowerCase().includes(lowerSearchTerm) ||
           account.description.toLowerCase().includes(lowerSearchTerm),
       );
@@ -468,9 +472,10 @@ export class ChartOfAccounts {
           await this.createCustomAccount(accountData);
           importedCount++;
         } catch (error) {
+          const errorMessage = error instanceof Error ? error.message : String(error);
           this.logger.log(
             'warn',
-            `Failed to import account ${parts[0]}: ${error.message}`,
+            `Failed to import account ${parts[0]}: ${errorMessage}`,
           );
         }
       }