diff --git a/src/index.ts b/src/index.ts
index 66c53cf..2432880 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -12,13 +12,13 @@ export * from './config.js';
 export * from './dialog.js';
 export * from './electronicStatement.js';
 export * from './httpClient.js';
-export { AccountBalanceResponse } from './interactions/balanceInteraction.js';
-export { ClientResponse, StatementResponse } from './interactions/customerInteraction.js';
-export {
+export type { AccountBalanceResponse } from './interactions/balanceInteraction.js';
+export type { ClientResponse, StatementResponse } from './interactions/customerInteraction.js';
+export type {
 	ElectronicStatementOptions,
 	ElectronicStatementResponse,
 } from './interactions/electronicStatementInteraction.js';
-export { PortfolioResponse } from './interactions/portfolioInteraction.js';
+export type { PortfolioResponse } from './interactions/portfolioInteraction.js';
 export * from './message.js';
 export * from './mt535parser.js';
 export * from './mt940parser.js';
diff --git a/src/mt940parser.ts b/src/mt940parser.ts
index 9020321..0405fe9 100644
--- a/src/mt940parser.ts
+++ b/src/mt940parser.ts
@@ -1,6 +1,6 @@
-import { Balance, Statement, Transaction } from './statement.js';
+import type { Balance, Statement, Transaction } from './statement.js';
 
-export { Statement, Transaction, Balance };
+export type { Statement, Transaction, Balance };
 
 export enum TokenType {
 	Tag = 'Tag',
diff --git a/tsconfig.json b/tsconfig.json
index 6ccab66..848c333 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -70,7 +70,7 @@
 		"declarationDir": "./dist/types" /* Specify the output directory for generated declaration files. */,
 		// "preserveValueImports": true,                     /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
 		/* Interop Constraints */
-		// "isolatedModules": true,                          /* Ensure that each file can be safely transpiled without relying on other imports. */
+		"isolatedModules": true /* Ensure that each file can be safely transpiled without relying on other imports. */,
 		// "verbatimModuleSyntax": true,                     /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */
 		// "allowSyntheticDefaultImports": true,             /* Allow 'import x from y' when a module doesn't have a default export. */
 		"esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */,