diff --git a/examples/swapi/.flowconfig b/examples/swapi/.flowconfig
index 8f2197a..d43fb0c 100644
--- a/examples/swapi/.flowconfig
+++ b/examples/swapi/.flowconfig
@@ -4,3 +4,9 @@ unclear-type
 unsafe-getters-setters
 untyped-import
 untyped-type-import
+
+[lints]
+uninitialized-instance-property=error
+
+[options]
+esproposal.optional_chaining=enable
diff --git a/examples/swapi/package.json b/examples/swapi/package.json
index 87048e6..ac0f4a2 100644
--- a/examples/swapi/package.json
+++ b/examples/swapi/package.json
@@ -3,11 +3,12 @@
         "@babel/cli": "^7.8.4",
         "@babel/node": "^7.7.0",
         "@babel/preset-flow": "^7.0.0",
-        "flow-bin": "0.111.3",
+        "flow-bin": "0.122.0",
         "flow-typed": "^2.6.2"
     },
     "dependencies": {
-        "graphql": "15.0.0-alpha.1",
+        "dataloader": "^2.0.0",
+        "graphql": "15.0.0",
         "node-fetch": "^2.6.0"
     }
 }
diff --git a/examples/swapi/swapi-loaders.js b/examples/swapi/swapi-loaders.js
index 7d878e5..214c20a 100644
--- a/examples/swapi/swapi-loaders.js
+++ b/examples/swapi/swapi-loaders.js
@@ -37,7 +37,11 @@ type ExtractArg = <Arg, Ret>([(Arg) => Ret]) => Arg;
 type ExtractPromisedReturnValue<A> = <R>((...A) => Promise<R>) => R;
 
 export type DataLoaderCodegenOptions = {|
-    errorHandler?: (resourcePath: $ReadOnlyArray<string>, error: any) => Promise<Error>,
+    errorHandler?: (
+        resourcePath: $ReadOnlyArray<string>,
+        // $FlowFixMe: We don't know what type the resource might throw, so we have to type error to "any" :(
+        error: any,
+    ) => Promise<Error>,
     resourceMiddleware?: {|
         before?: <T>(resourcePath: $ReadOnlyArray<string>, resourceArgs: T) => Promise<T>,
         after?: <T>(resourcePath: $ReadOnlyArray<string>, response: T) => Promise<T>,
diff --git a/examples/swapi/yarn.lock b/examples/swapi/yarn.lock
index a4d0d7b..28e14d0 100644
--- a/examples/swapi/yarn.lock
+++ b/examples/swapi/yarn.lock
@@ -546,6 +546,11 @@ crypt@~0.0.1:
   resolved "https://registry.yarnpkg.com/crypt/-/crypt-0.0.2.tgz#88d7ff7ec0dfb86f713dc87bbb42d044d3e6c41b"
   integrity sha1-iNf/fsDfuG9xPch7u0LQRNPmxBs=
 
+dataloader@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/dataloader/-/dataloader-2.0.0.tgz#41eaf123db115987e21ca93c005cd7753c55fe6f"
+  integrity sha512-YzhyDAwA4TaQIhM5go+vCLmU0UikghC/t9DTQYZR2M/UvZ1MdOhPezSDZcjj9uqQJOMqjLcpWtyW2iNINdlatQ==
+
 debug@^2.2.0, debug@^2.3.3:
   version "2.6.9"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
@@ -759,10 +764,10 @@ find-up@^3.0.0:
   dependencies:
     locate-path "^3.0.0"
 
-flow-bin@0.111.3:
-  version "0.111.3"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.111.3.tgz#8653a413400ebc966097a47c81fb4e6b722a5921"
-  integrity sha512-Gn27aRTjSFicukZ/pq3raRERmSk9UWszhIK9eNtj6843L54YtK+jk2OkQWV70+VKi9LmWyfItCkhwoIVy7L2lA==
+flow-bin@0.122.0:
+  version "0.122.0"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.122.0.tgz#c723a2b33b1a70bd10204704ae1dc776d5d89d79"
+  integrity sha512-my8N5jgl/A+UVby9E7NDppHdhLgRbWgKbmFZSx2MSYMRh3d9YGnM2MM+wexpUpl0ftY1IM6ZcUwaAhrypLyvlA==
 
 flow-typed@^2.6.2:
   version "2.6.2"
@@ -934,12 +939,10 @@ graceful-fs@^4.1.11, graceful-fs@^4.1.2, graceful-fs@^4.1.6:
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.3.tgz#4a12ff1b60376ef09862c2093edd908328be8423"
   integrity sha512-a30VEBm4PEdx1dRB7MFK7BejejvCvBronbLjht+sHuGYj8PHs7M/5Z+rt5lw551vZ7yfTCj4Vuyy3mSJytDWRQ==
 
-graphql@15.0.0-alpha.1:
-  version "15.0.0-alpha.1"
-  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.0.0-alpha.1.tgz#87b9a6b8825a8863e57ea1b1f261b1d406e88c63"
-  integrity sha512-TB/CnOxBPo7+mqtYX0cuKcLYWLiwy9VgCWad9XcsrwfoGMuijiQH1CMsGKEhCirMN8FmRjm1o4C3MPn8PcOxxg==
-  dependencies:
-    iterall "^1.2.2"
+graphql@15.0.0:
+  version "15.0.0"
+  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.0.0.tgz#042a5eb5e2506a2e2111ce41eb446a8e570b8be9"
+  integrity sha512-ZyVO1xIF9F+4cxfkdhOJINM+51B06Friuv4M66W7HzUOeFd+vNzUn4vtswYINPi6sysjf1M2Ri/rwZALqgwbaQ==
 
 has-flag@^3.0.0:
   version "3.0.0"
@@ -1250,11 +1253,6 @@ isurl@^1.0.0-alpha5:
     has-to-string-tag-x "^1.2.0"
     is-object "^1.0.1"
 
-iterall@^1.2.2:
-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/iterall/-/iterall-1.2.2.tgz#92d70deb8028e0c39ff3164fdbf4d8b088130cd7"
-  integrity sha512-yynBb1g+RFUPY64fTrFv7nsjRrENBQJaX2UL+2Szc9REFrSNm1rpSXHGzhmAy7a9uv3vlvgBlXnf9RqmPH1/DA==
-
 js-tokens@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/js-tokens/-/js-tokens-4.0.0.tgz#19203fb59991df98e3a287050d4647cdeaf32499"
diff --git a/src/codegen.ts b/src/codegen.ts
index ccdc6b8..9f2f554 100644
--- a/src/codegen.ts
+++ b/src/codegen.ts
@@ -85,7 +85,11 @@ export default function codegen(
         type ExtractPromisedReturnValue<A> = <R>((...A) => Promise<R>) => R;
 
         export type DataLoaderCodegenOptions = {|
-            errorHandler?: (resourcePath: $ReadOnlyArray<string>, error: any) => Promise<Error>,
+            errorHandler?: (
+                resourcePath: $ReadOnlyArray<string>,
+                // $FlowFixMe: We don't know what type the resource might throw, so we have to type error to "any" :(
+                error: any,
+            ) => Promise<Error>,
             resourceMiddleware?: {|
                 before?: <T>(resourcePath: $ReadOnlyArray<string>, resourceArgs: T) => Promise<T>,
                 after?: <T>(resourcePath: $ReadOnlyArray<string>, response: T) => Promise<T>,