diff --git a/.flowconfig b/.flowconfig
index b3be8830312..0d4a2f081f7 100644
--- a/.flowconfig
+++ b/.flowconfig
@@ -2,9 +2,37 @@
 .*/coverage/.*
 .*/resources/.*
 .*/node_modules/.*
+!<PROJECT_ROOT>/node_modules/chai
+!<PROJECT_ROOT>/node_modules/mocha
+!<PROJECT_ROOT>/node_modules/graphql
+!<PROJECT_ROOT>/node_modules/iterall
+!<PROJECT_ROOT>/node_modules/codemirror
 
 [include]
 
 [libs]
 
 [options]
+include_warnings=true
+module.use_strict=true
+
+[lints]
+sketchy-null-bool=off
+sketchy-null-string=off
+sketchy-null-number=error
+sketchy-null-mixed=error
+sketchy-number=error
+untyped-type-import=error
+nonstrict-import=off
+untyped-import=off
+unclear-type=off
+deprecated-type=off
+deprecated-utility=error
+dynamic-export=off
+unsafe-getters-setters=error
+inexact-spread=error
+unnecessary-optional-chain=error
+unnecessary-invariant=off
+
+[version]
+^0.98.0
diff --git a/.gitignore b/.gitignore
index 87596e74645..b025b17e81d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ coverage/
 /utils
 /variables
 /results
+/__tests__
diff --git a/package.json b/package.json
index e594bfc6753..8c923f2dc84 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "mocha_tdd": "--full-trace --watch --require resources/mocha-bootload src/**/__tests__/**/*-test.js"
   },
   "scripts": {
-    "test": "npm run lint && npm run pretty-check && npm run testonly",
+    "test": "yarn run check && yarn run lint && yarn run pretty-check && yarn run testonly",
     "testonly": "babel-node ./node_modules/.bin/_mocha $npm_package_options_mocha",
     "testwatch": "babel-node --inspect ./node_modules/.bin/_mocha $npm_package_options_mocha_tdd",
     "lint": "eslint src",
@@ -42,7 +42,7 @@
     "watch": "babel --optional runtime resources/watch.js | node",
     "pretty": "node resources/pretty.js",
     "pretty-check": "node resources/pretty.js --check",
-    "preversion": ". ./resources/checkgit.sh && npm test",
+    "preversion": ". ./resources/checkgit.sh && yarn test",
     "prepublish": ". ./resources/prepublish.sh"
   },
   "peerDependencies": {
@@ -67,7 +67,7 @@
     "eslint": "^5.16.0",
     "eslint-plugin-babel": "5.3.0",
     "eslint-plugin-flowtype": "3.9.1",
-    "flow-bin": "^0.56.0",
+    "flow-bin": "^0.98.1",
     "graphql": "^14.0.2",
     "jsdom": "^11.2.0",
     "mocha": "3.5.0",
diff --git a/src/info.js b/src/info.js
index ffe862d9153..53576c10c76 100644
--- a/src/info.js
+++ b/src/info.js
@@ -179,17 +179,21 @@ function renderDeprecation(into, options, def) {
   }
 }
 
-function text(into, content, className, options, ref) {
+function text(into, content, className, options = {onClick: null}, ref) {
   if (className) {
     const onClick = options.onClick;
-    const node = document.createElement(onClick ? 'a' : 'span');
+    let node;
     if (onClick) {
+      node = document.createElement('a');
+
       // Providing a href forces proper a tag behavior, though we don't actually
       // want clicking the node to navigate anywhere.
       node.href = 'javascript:void 0'; // eslint-disable-line no-script-url
-      node.addEventListener('click', function(e) {
+      node.addEventListener('click', function(e: MouseEvent) {
         onClick(ref, e);
       });
+    } else {
+      node = document.createElement('span');
     }
     node.className = className;
     node.appendChild(document.createTextNode(content));
diff --git a/src/utils/SchemaReference.js b/src/utils/SchemaReference.js
index 67c7bb5fe12..1c2a91c9e91 100644
--- a/src/utils/SchemaReference.js
+++ b/src/utils/SchemaReference.js
@@ -14,6 +14,7 @@ import type {
   GraphQLArgument,
   GraphQLDirective,
   GraphQLEnumValue,
+  GraphQLEnumType,
   GraphQLField,
   GraphQLNamedType,
 } from 'graphql';
@@ -27,7 +28,7 @@ export type SchemaReference =
 
 export type FieldReference = {
   kind: 'Field',
-  field: GraphQLField,
+  field: GraphQLField<any, any>,
   type: ?GraphQLNamedType,
 };
 
@@ -39,7 +40,7 @@ export type DirectiveReference = {
 export type ArgumentReference = {
   kind: 'Argument',
   argument: GraphQLArgument,
-  field?: GraphQLField,
+  field?: GraphQLField<any, any>,
   type?: ?GraphQLNamedType,
   directive?: GraphQLDirective,
 };
@@ -93,6 +94,7 @@ export function getEnumValueReference(typeInfo: any): EnumValueReference {
   return {
     kind: 'EnumValue',
     value: typeInfo.enumValue,
+    // $FlowFixMe
     type: getNamedType(typeInfo.inputType),
   };
 }
diff --git a/yarn.lock b/yarn.lock
index ce65c70700b..4432c53f222 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1704,9 +1704,10 @@ flatted@^2.0.0:
   resolved "https://registry.yarnpkg.com/flatted/-/flatted-2.0.0.tgz#55122b6536ea496b4b44893ee2608141d10d9916"
   integrity sha512-R+H8IZclI8AAkSBRQJLVOsxwAoHd6WC40b4QTNWIjzAa6BXOBfQcM587MXDTVPeYaopFNWHUFLx7eNmHDSxMWg==
 
-flow-bin@^0.56.0:
-  version "0.56.0"
-  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.56.0.tgz#ce43092203a344ba9bf63c0cabe95d95145f6cad"
+flow-bin@^0.98.1:
+  version "0.98.1"
+  resolved "https://registry.yarnpkg.com/flow-bin/-/flow-bin-0.98.1.tgz#a8d781621c91703df69928acc83c9777e2fcbb49"
+  integrity sha512-y1YzQgbFUX4EG6h2EO8PhyJeS0VxNgER8XsTwU8IXw4KozfneSmGVgw8y3TwAOza7rVhTlHEoli1xNuNW1rhPw==
 
 for-in@^1.0.1, for-in@^1.0.2:
   version "1.0.2"
@@ -1943,8 +1944,9 @@ graphql-request@^1.5.0:
     cross-fetch "2.2.2"
 
 graphql@^14.0.2:
-  version "14.0.2"
-  resolved "https://registry.yarnpkg.com/graphql/-/graphql-14.0.2.tgz#7dded337a4c3fd2d075692323384034b357f5650"
+  version "14.3.1"
+  resolved "https://registry.yarnpkg.com/graphql/-/graphql-14.3.1.tgz#b3aa50e61a841ada3c1f9ccda101c483f8e8c807"
+  integrity sha512-FZm7kAa3FqKdXy8YSSpAoTtyDFMIYSpCDOr+3EqlI1bxmtHu+Vv/I2vrSeT1sBOEnEniX3uo4wFhFdS/8XN6gA==
   dependencies:
     iterall "^1.2.2"
 
@@ -2308,6 +2310,7 @@ isstream@~0.1.2:
 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-levenshtein@^1.1.3:
   version "1.1.6"