diff --git a/.gitignore b/.gitignore
index a3c258e..60585f2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@ node_modules
 lib/
 .nyc_output/
 coverage/
+tags
diff --git a/src/index.d.ts b/src/index.d.ts
new file mode 100644
index 0000000..9df0b88
--- /dev/null
+++ b/src/index.d.ts
@@ -0,0 +1,60 @@
+declare module 'searchjs' {
+  interface Defaults {
+    negator?: boolean;
+    join?: string;
+    text?: boolean;
+    word?: boolean;
+    separator?: string;
+    propertySearch?: boolean;
+    propertySearchDepth?: number;
+    start?: boolean;
+    end?: boolean;
+  }
+
+  type SingleField = null | undefined | boolean | number | Date | string;
+  type Field = SingleField | SingleField[];
+
+  interface SearchPrimitiveRange {
+    from?: number | string;
+    gte?: number | string;
+    gt?: number | string;
+    to?: number | string;
+    lte?: number | string;
+    lt?: number | string;
+  }
+  type SearchPrimitiveValues = null | undefined | string | number | Date | boolean | SearchPrimitiveRange;
+
+  export type JoinValue = "OR" | "AND";
+
+  type SearchPrimitive = {
+    [key: string]: SearchPrimitiveValues | SearchPrimitiveValues[] | SearchPrimitive | SearchPrimitive[]
+    terms?: SearchPrimitive[];
+    _propertySearch?: boolean;
+    _propertySearchDepth?: number;
+    _not?: boolean | null;
+    _join?: JoinValue;
+    _text?: boolean;
+    _word?: boolean;
+    _start?: boolean;
+    _end?: boolean;
+    _separator?: string;
+  }
+
+  interface SearchObject  {
+    [key: string]: Field | SearchObject
+  }
+
+  type SearchArray = SearchObject[] | undefined[];
+  type SearchData = SearchObject;
+
+  export function setDefaults(defaults: Defaults): void;
+  export function resetDefaults(): void;
+  export function singleMatch(field: Field, 
+                       s: SearchPrimitive, 
+                       text: Defaults["text"], 
+                       word: Defaults["word"], 
+                       start: Defaults["start"], 
+                       end: Defaults["end"]): boolean;
+  export function matchArray<T>(ary: T[], search: SearchPrimitive): T[];
+  export function matchObject<T>(object: T, search: SearchPrimitive): T;
+}