diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..3649a88
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,52 @@
+import BigNumber from "bignumber.js";
+
+export interface Transaction {
+  date: Date;
+  amount: BigNumber;
+  isReversal: boolean;
+  currency: string;
+  detailSegments: string[];
+  details: string;
+  structuredDetails: Record<string, string>;
+  transactionType: string;
+  reference: string;
+  entryDate: Date;
+  fundsCode: string;
+  bankReference: string;
+  extraDetails: string;
+  nonSwift: string;
+}
+
+export interface StatementNumber {
+  statement: string;
+  sequence: string;
+  section: string;
+}
+
+export interface Statement {
+  transactionReference: string;
+  relatedReference: string;
+  accountIdentification: string;
+  number: StatementNumber;
+  statementDate: Date;
+  openingBalanceDate: Date;
+  closingBalanceDate: Date;
+  closingAvailableBalanceDate: Date;
+  forwardAvailableBalanceDate: Date;
+  currency: string;
+  openingBalance: BigNumber;
+  closingBalance: BigNumber;
+  closingAvailableBalance: BigNumber;
+  forwardAvailableBalance: BigNumber;
+  informationToAccountOwner: string;
+  messageBlocks: Record<string, unknown>;
+  transactions: Transaction[];
+}
+
+export interface ParseOptions {
+  data: string;
+  type: "mt940" | "mt942";
+  validate?: boolean;
+}
+
+export function parse(opts: ParseOptions): Statement[];
diff --git a/package.json b/package.json
index ac272db..6c3dada 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "1.0.1",
   "description": "Swift financial message parser (MT940, MT942)",
   "main": "index.js",
+  "types": "index.d.ts",
   "bin": {
     "swift-parse": "scripts/cli.js"
   },