Remove maybe types

src/connection/arrayconnection.d.ts

@@ -70,7 +70,7 @@ export function cursorToOffset(cursor: ConnectionCursor): number;
 export function cursorForObjectInConnection<T>(
   data: ReadonlyArray<T>,
   object: T,
-): ConnectionCursor | null | undefined;
+): ConnectionCursor | null;
 
 /**
  * Given an optional cursor and a default offset, returns the offset

src/connection/arrayconnection.js

@@ -139,7 +139,7 @@ export function cursorToOffset(cursor: ConnectionCursor): number {
 export function cursorForObjectInConnection<T>(
   data: $ReadOnlyArray<T>,
   object: T,
-): ?ConnectionCursor {
+): ConnectionCursor | null {
   const offset = data.indexOf(object);
   if (offset === -1) {
     return null;

src/connection/connection.d.ts

@@ -42,12 +42,12 @@ export const connectionArgs: GraphQLFieldConfigArgumentMap &
   BackwardConnectionArgs;
 
 export interface ConnectionConfig {
-  name?: string | null;
+  name?: string;
   nodeType: GraphQLObjectType;
-  resolveNode?: GraphQLFieldResolver<any, any> | null;
-  resolveCursor?: GraphQLFieldResolver<any, any> | null;
-  edgeFields?: Thunk<GraphQLFieldConfigMap<any, any>> | null;
-  connectionFields?: Thunk<GraphQLFieldConfigMap<any, any>> | null;
+  resolveNode?: GraphQLFieldResolver<any, any>;
+  resolveCursor?: GraphQLFieldResolver<any, any>;
+  edgeFields?: Thunk<GraphQLFieldConfigMap<any, any>>;
+  connectionFields?: Thunk<GraphQLFieldConfigMap<any, any>>;
 }
 
 export interface GraphQLConnectionDefinitions {

src/connection/connection.js

@@ -52,12 +52,12 @@ export const connectionArgs: GraphQLFieldConfigArgumentMap = {
 };
 
 type ConnectionConfig = {
-  name?: ?string,
+  name?: string,
   nodeType: GraphQLObjectType,
-  resolveNode?: ?GraphQLFieldResolver<any, any>,
-  resolveCursor?: ?GraphQLFieldResolver<any, any>,
-  edgeFields?: ?Thunk<GraphQLFieldConfigMap<any, any>>,
-  connectionFields?: ?Thunk<GraphQLFieldConfigMap<any, any>>,
+  resolveNode?: GraphQLFieldResolver<any, any>,
+  resolveCursor?: GraphQLFieldResolver<any, any>,
+  edgeFields?: Thunk<GraphQLFieldConfigMap<any, any>>,
+  connectionFields?: Thunk<GraphQLFieldConfigMap<any, any>>,
 };
 
 type GraphQLConnectionDefinitions = {

src/connection/connectiontypes.d.ts

@@ -7,10 +7,10 @@ export type ConnectionCursor = string;
  * A flow type designed to be exposed as `PageInfo` over GraphQL.
  */
 export interface PageInfo {
-  startCursor?: ConnectionCursor | null;
-  endCursor?: ConnectionCursor | null;
-  hasPreviousPage?: boolean | null;
-  hasNextPage?: boolean | null;
+  startCursor: ConnectionCursor | null;
+  endCursor: ConnectionCursor | null;
+  hasPreviousPage: boolean;
+  hasNextPage: boolean;
 }
 
 /**

src/connection/connectiontypes.js

@@ -9,10 +9,10 @@ export type ConnectionCursor = string;
  * A flow type designed to be exposed as `PageInfo` over GraphQL.
  */
 export type PageInfo = {
-  startCursor: ?ConnectionCursor,
-  endCursor: ?ConnectionCursor,
-  hasPreviousPage: ?boolean,
-  hasNextPage: ?boolean,
+  startCursor: ConnectionCursor | null,
+  endCursor: ConnectionCursor | null,
+  hasPreviousPage: boolean,
+  hasNextPage: boolean,
 };
 
 /**
@@ -35,9 +35,9 @@ export type Edge<T> = {
  * A flow type describing the arguments a connection field receives in GraphQL.
  */
 export type ConnectionArguments = {
-  before?: ?ConnectionCursor,
-  after?: ?ConnectionCursor,
-  first?: ?number,
-  last?: ?number,
+  before?: ConnectionCursor | null,
+  after?: ConnectionCursor | null,
+  first?: number | null,
+  last?: number | null,
   ...
 };

src/node/node.d.ts

@@ -24,7 +24,7 @@ export interface GraphQLNodeDefinitions<TContext> {
  */
 export function nodeDefinitions<TContext>(
   idFetcher: (id: string, context: TContext, info: GraphQLResolveInfo) => any,
-  typeResolver?: GraphQLTypeResolver<any, TContext> | null,
+  typeResolver?: GraphQLTypeResolver<any, TContext>,
 ): GraphQLNodeDefinitions<TContext>;
 
 // TS_SPECIFIC: This type is only exported by TypeScript
@@ -52,6 +52,6 @@ export function fromGlobalId(globalId: string): ResolvedGlobalId;
  * property on the object.
  */
 export function globalIdField(
-  typeName?: string | null,
+  typeName?: string,
   idFetcher?: (object: any, context: any, info: GraphQLResolveInfo) => string,
 ): GraphQLFieldConfig<any, any>;

src/node/node.js

@@ -33,7 +33,7 @@ type GraphQLNodeDefinitions<TContext> = {
  */
 export function nodeDefinitions<TContext>(
   idFetcher: (id: string, context: TContext, info: GraphQLResolveInfo) => any,
-  typeResolver?: ?GraphQLTypeResolver<any, TContext>,
+  typeResolver?: GraphQLTypeResolver<any, TContext>,
 ): GraphQLNodeDefinitions<TContext> {
   const nodeInterface = new GraphQLInterfaceType({
     name: 'Node',
@@ -110,7 +110,7 @@ export function fromGlobalId(globalId: string): ResolvedGlobalId {
  * property on the object.
  */
 export function globalIdField(
-  typeName?: ?string,
+  typeName?: string,
   idFetcher?: (object: any, context: any, info: GraphQLResolveInfo) => string,
 ): GraphQLFieldConfig<any, mixed> {
   return {

src/node/plural.js

@@ -18,7 +18,7 @@ type PluralIdentifyingRootFieldConfig = {
     context: any,
     info: GraphQLResolveInfo,
   ) => ?any,
-  description?: ?string,
+  description?: string,
 };
 
 export function pluralIdentifyingRootField(