allow undefined dict values

Author: dustin deus

src/http-data-source.ts

@@ -24,7 +24,7 @@ export type CacheTTLOptions = {
 }
 
 interface Dictionary<T> {
-  [Key: string]: T
+  [Key: string]: T | undefined
 }
 
 export type RequestOptions = {

test/rest-data-source.test.ts

@@ -180,7 +180,8 @@ test('Should be able to pass query params', async (t) => {
       return this.get(path, {
         query: {
           a: 1,
-          b: '2'
+          b: '2',
+          c: undefined
         }
       })
     }