diff --git a/mysql/index.d.ts b/mysql/index.d.ts
new file mode 100644
index 0000000..cbfd75d
--- /dev/null
+++ b/mysql/index.d.ts
@@ -0,0 +1,19 @@
+declare module 'sqlutils/mysql' {
+    type Transformation = {
+        key: string | [string, string],
+        columns?: Array<string | [string, string]>,
+        children?: Array<Transformation & ChildTransformation> 
+    }
+
+    type ChildTransformation = {
+        rename: string,
+        single?: boolean,
+        flat?: boolean
+    }
+
+    export function format(statement: string, obj: object|object[]): string
+    export function escape(value: any): string
+    export function buildWhereFromQuery(query: object): string
+    export function groupColumnsToObjects(rows: object[], primary_key: string, groups: object[]): object[]
+    export function transformer(rows: any[], transformation: Transformation): object[]
+};
\ No newline at end of file
diff --git a/pg/index.d.ts b/pg/index.d.ts
new file mode 100644
index 0000000..d47edb3
--- /dev/null
+++ b/pg/index.d.ts
@@ -0,0 +1,19 @@
+declare module 'sqlutils/pg' {
+    type Transformation = {
+        key: string | [string, string],
+        columns?: Array<string | [string, string]>,
+        children?: Array<Transformation & ChildTransformation> 
+    }
+
+    type ChildTransformation = {
+        rename: string,
+        single?: boolean,
+        flat?: boolean
+    }
+
+    export function format(statement: string, obj: object|object[]): string
+    export function escape(value: any): string
+    export function buildWhereFromQuery(query: object): string
+    export function groupColumnsToObjects(rows: object[], primary_key: string, groups: object[]): object[]
+    export function transformer(rows: any[], transformation: Transformation): object[]
+};
\ No newline at end of file