diff --git a/.npmignore b/.npmignore
index bb74c51..dd61efe 100644
--- a/.npmignore
+++ b/.npmignore
@@ -6,6 +6,5 @@
 .yarnrc.yml
 babel.config.*
 jest.config.*
-src
 tsconfig*.json
 tslint.json
diff --git a/src/utils/responseJson.ts b/src/utils/responseJson.ts
index 5e5a6be..d7ae5bb 100644
--- a/src/utils/responseJson.ts
+++ b/src/utils/responseJson.ts
@@ -1 +1 @@
-export const responseJson = (response: Response) => response.json();
+export const responseJson = (response: Response | undefined) => (response && response.json()) || {};
diff --git a/tsconfig.production.json b/tsconfig.production.json
index 460610c..e221502 100644
--- a/tsconfig.production.json
+++ b/tsconfig.production.json
@@ -13,9 +13,9 @@
         "noImplicitReturns": true,
         "noImplicitThis": true,
         "outDir": "lib/",
-        "removeComments": true,
+        "removeComments": false,
         "rootDirs": ["./", "src/"],
-        "sourceMap": false,
+        "sourceMap": true,
         "strict": true,
         "strictNullChecks": true,
         "target": "es2017"