diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..fa87e48
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,5 @@
+export function decode(querystring : string, separator? : string, equal? : string, options? : { maxKeys : number }) : {[ index : string] : string};
+export function parse(querystring : string, separator? : string, equal? : string, options? : { maxKeys : number }) : {[ index : string] : string};
+
+export function encode(object : any, separator? : string, equal? : string, name? : string) : string;
+export function stringify(object : any, separator? : string, equal? : string, name? : string) : string;
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