diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..f10b2d2
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,28 @@
+declare class ExpectHelper {
+    expectEqual(actualValue: any, expectedValue: any, customErrorMsg?: string): void;
+    expectNotEqual(actualValue: any, expectedValue: any, customErrorMsg?: string): void;
+    expectDeepEqual(actualValue: any, expectedValue: any, customErrorMsg?: string): void;
+    expectNotDeepEqual(actualValue: any, expectedValue: any, customErrorMsg?: string): void;
+    expectContain(actualValue: any, expectedValueToContain: any, customErrorMsg?: string): void;
+    expectNotContain(actualValue: any, expectedValueToNotContain: any, customErrorMsg?: string): void;
+    expectStartsWith(actualValue: string, expectedValueToStartWith: string, customErrorMsg?: string): void;
+    expectNotStartsWith(actualValue: string, expectedValueToNotStartWith: string, customErrorMsg?: string): void;
+    expectEndsWith(actualValue: string, expectedValueToEndWith: string, customErrorMsg?: string): void;
+    expectNotEndsWith(actualValue: string, expectedValueToNotEndWith: string, customErrorMsg?: string): void;
+    expectJsonSchema(targetData: any, jsonSchema: any, customErrorMsg?: string): void;
+    expectJsonSchemaUsingAJV(targetData: any, jsonSchema: any, customErrorMsg?: string, ajvOptions?: any): void;
+    expectHasProperty(targetData: any, propertyName: string, customErrorMsg?: string): void;
+    expectToBeA(targetData: any, type: string, customErrorMsg?: string): void;
+    expectToBeAn(targetData: any, type: string, customErrorMsg?: string): void;
+    expectMatchRegex(targetData: string, regex: RegExp, customErrorMsg?: string): void;
+    expectLengthOf(targetData: any, length: number, customErrorMsg?: string): void;
+    expectEmpty(targetData: any, customErrorMsg?: string): void;
+    expectTrue(targetData: any, customErrorMsg?: string): void;
+    expectFalse(targetData: any, customErrorMsg?: string): void;
+    expectAbove(targetData: number, aboveThan: number, customErrorMsg?: string): void;
+    expectBelow(targetData: number, belowThan: number, customErrorMsg?: string): void;
+    expectDeepMembers(actualValue: any[], expectedValue: any[], customErrorMsg?: string): void;
+    expectDeepIncludeMembers(superset: any[], set: any[], customErrorMsg?: string): void;
+    expectDeepEqualExcluding(actualValue: any, expectedValue: any, fieldsToExclude: string | string[], customErrorMsg?: string): void;
+    expectMatchesPattern(actualValue: object, expectedPattern: object, customErrorMsg?: string): void;
+  }  
\ No newline at end of file
diff --git a/package.json b/package.json
index 5f93721..87f9deb 100644
--- a/package.json
+++ b/package.json
@@ -3,6 +3,7 @@
   "version": "0.2.1",
   "description": "Expect helper for CodeceptJS",
   "type": "module",
+  "types": "index.d.ts",
   "main": "index.js",
   "scripts": {
     "test": "mocha index_test.js"