add includeFalsyKeys option

Author: Bret Hubbard

src/__tests__/jsonToGraphQLQuery.tests.ts

@@ -405,6 +405,27 @@ describe('jsonToGraphQL()', () => {
         );
     });
 
+    it('includes fields with falsy values if includeFalsyKeys is true', () => {
+        const query = {
+            query: {
+                Posts: {
+                    __args: {
+                        a: false
+                    },
+                    id: '',
+                    name: ''
+                },
+                Lorem: {
+                    id: ''
+                },
+                Ipsum: false
+            }
+        };
+        expect(jsonToGraphQLQuery(query, { includeFalsyKeys: true })).to.equal(
+            'query { Posts (a: false) { id name } Lorem { id } Ipsum }'
+        );
+    });
+
     it('ignores a field that exists in the initial object', () => {
         const query = {
             query: {

src/jsonToGraphQLQuery.ts

@@ -142,7 +142,7 @@ function convertQuery(node: any, level: number, output: Array<[string, number]>,
                     output.push(['}', level]);
                 }
 
-            } else if (node[key]) {
+            } else if (options.includeFalsyKeys === true || node[key]) {
                 output.push([`${key}`, level]);
             }
         });
@@ -151,6 +151,7 @@ function convertQuery(node: any, level: number, output: Array<[string, number]>,
 export interface IJsonToGraphQLOptions {
     pretty?: boolean;
     ignoreFields?: string[];
+    includeFalsyKeys?: boolean;
 }
 
 export function jsonToGraphQLQuery(query: any, options: IJsonToGraphQLOptions = {}) {