diff --git a/packages/interface/src/GraphQLLanguageService.js b/packages/interface/src/GraphQLLanguageService.js
index b262db30..4f9628ec 100644
--- a/packages/interface/src/GraphQLLanguageService.js
+++ b/packages/interface/src/GraphQLLanguageService.js
@@ -79,7 +79,7 @@ export class GraphQLLanguageService {
     const projectConfig = this._graphQLConfig.getConfigForFile(uri);
     const schemaPath = projectConfig.schemaPath;
     try {
-      const queryAST = parse(query);
+      const queryAST = parse(query, projectConfig.parseOptions);
       if (!schemaPath || uri !== schemaPath) {
         queryHasExtensions = queryAST.definitions.some(definition => {
           switch (definition.kind) {
@@ -121,6 +121,7 @@ export class GraphQLLanguageService {
     const fragmentDependencies = await this._graphQLCache.getFragmentDependencies(
       query,
       fragmentDefinitions,
+      projectConfig,
     );
     const dependenciesSource = fragmentDependencies.reduce(
       (prev, cur) => `${prev} ${print(cur.definition)}`,
@@ -131,7 +132,7 @@ export class GraphQLLanguageService {
 
     let validationAst = null;
     try {
-      validationAst = parse(source);
+      validationAst = parse(source, projectConfig.parseOptions);
     } catch (error) {
       // the query string is already checked to be parsed properly - errors
       // from this parse must be from corrupted fragment dependencies.
@@ -154,7 +155,7 @@ export class GraphQLLanguageService {
     }
 
     const schema = await this._graphQLCache
-      .getSchema(projectConfig.projectName, queryHasExtensions)
+      .getSchema(projectConfig, queryHasExtensions)
       .catch(() => null);
 
     if (!schema) {
@@ -171,7 +172,7 @@ export class GraphQLLanguageService {
   ): Promise<Array<CompletionItem>> {
     const projectConfig = this._graphQLConfig.getConfigForFile(filePath);
     const schema = await this._graphQLCache
-      .getSchema(projectConfig.projectName)
+      .getSchema(projectConfig)
       .catch(() => null);
 
     if (schema) {
@@ -187,7 +188,7 @@ export class GraphQLLanguageService {
   ): Promise<Hover.contents> {
     const projectConfig = this._graphQLConfig.getConfigForFile(filePath);
     const schema = await this._graphQLCache
-      .getSchema(projectConfig.projectName)
+      .getSchema(projectConfig)
       .catch(() => null);
 
     if (schema) {
@@ -205,7 +206,7 @@ export class GraphQLLanguageService {
 
     let ast;
     try {
-      ast = parse(query);
+      ast = parse(query, projectConfig.parseOptions);
     } catch (error) {
       return null;
     }
diff --git a/packages/server/src/GraphQLCache.js b/packages/server/src/GraphQLCache.js
index 111ca97f..ebf892cf 100644
--- a/packages/server/src/GraphQLCache.js
+++ b/packages/server/src/GraphQLCache.js
@@ -83,6 +83,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
   getFragmentDependencies = async (
     query: string,
     fragmentDefinitions: ?Map<string, FragmentInfo>,
+    projectConfig: GraphQLProjectConfig,
   ): Promise<Array<FragmentInfo>> => {
     // If there isn't context for fragment references,
     // return an empty array.
@@ -93,7 +94,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
     // Return an empty array.
     let parsedQuery;
     try {
-      parsedQuery = parse(query);
+      parsedQuery = parse(query, projectConfig.parseOptions);
     } catch (error) {
       return [];
     }
@@ -183,6 +184,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
   getObjectTypeDependencies = async (
     query: string,
     objectTypeDefinitions: ?Map<string, ObjectTypeInfo>,
+    projectConfig: GraphQLProjectConfig,
   ): Promise<Array<ObjectTypeInfo>> => {
     // If there isn't context for object type references,
     // return an empty array.
@@ -193,7 +195,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
     // Return an empty array.
     let parsedQuery;
     try {
-      parsedQuery = parse(query);
+      parsedQuery = parse(query, projectConfig.parseOptions);
     } catch (error) {
       return [];
     }
@@ -320,7 +322,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
             return;
           }
 
-          const fileAndContent = await this.promiseToReadGraphQLFile(filePath);
+          const fileAndContent = await this.promiseToReadGraphQLFile(filePath, projectConfig);
           graphQLFileMap.set(filePath, {
             ...fileAndContent,
             size,
@@ -337,6 +339,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
                 {size, mtime},
                 filePath,
                 exists,
+                projectConfig,
               ),
             );
           }
@@ -413,9 +416,10 @@ export class GraphQLCache implements GraphQLCacheInterface {
     metrics: {size: number, mtime: number},
     filePath: Uri,
     exists: boolean,
+    projectConfig: GraphQLProjectConfig,
   ): Promise<Map<Uri, GraphQLFileInfo>> {
     const fileAndContent = exists
-      ? await this.promiseToReadGraphQLFile(filePath)
+      ? await this.promiseToReadGraphQLFile(filePath, projectConfig)
       : null;
     const graphQLFileInfo = {...fileAndContent, ...metrics};
 
@@ -438,11 +442,12 @@ export class GraphQLCache implements GraphQLCacheInterface {
     rootDir: Uri,
     filePath: Uri,
     contents: Array<CachedContent>,
+    projectConfig: GraphQLProjectConfig,
   ): Promise<void> {
     const cache = this._fragmentDefinitionsCache.get(rootDir);
     const asts = contents.map(({query}) => {
       try {
-        return {ast: parse(query), query};
+        return {ast: parse(query, projectConfig.parseOptions), query};
       } catch (error) {
         return {ast: null, query};
       }
@@ -475,9 +480,10 @@ export class GraphQLCache implements GraphQLCacheInterface {
     rootDir: Uri,
     filePath: Uri,
     exists: boolean,
+    projectConfig: GraphQLProjectConfig,
   ): Promise<void> {
     const fileAndContent = exists
-      ? await this.promiseToReadGraphQLFile(filePath)
+      ? await this.promiseToReadGraphQLFile(filePath, projectConfig)
       : null;
     // In the case of fragment definitions, the cache could just map the
     // definition name to the parsed ast, whether or not it existed
@@ -489,7 +495,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
         cache.delete(filePath);
       }
     } else if (fileAndContent && fileAndContent.queries) {
-      this.updateFragmentDefinition(rootDir, filePath, fileAndContent.queries);
+      this.updateFragmentDefinition(rootDir, filePath, fileAndContent.queries, projectConfig);
     }
   }
 
@@ -497,11 +503,12 @@ export class GraphQLCache implements GraphQLCacheInterface {
     rootDir: Uri,
     filePath: Uri,
     contents: Array<CachedContent>,
+    projectConfig: GraphQLProjectConfig,
   ): Promise<void> {
     const cache = this._typeDefinitionsCache.get(rootDir);
     const asts = contents.map(({query}) => {
       try {
-        return {ast: parse(query), query};
+        return {ast: parse(query, projectConfig.parseOptions), query};
       } catch (error) {
         return {ast: null, query};
       }
@@ -538,6 +545,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
     rootDir: Uri,
     filePath: Uri,
     exists: boolean,
+    projectConfig: GraphQLProjectConfig,
   ): Promise<void> {
     const fileAndContent = exists
       ? await this.promiseToReadGraphQLFile(filePath)
@@ -623,16 +631,10 @@ export class GraphQLCache implements GraphQLCacheInterface {
   }
 
   getSchema = async (
-    appName: ?string,
+    projectConfig: GraphQLProjectConfig,
     queryHasExtensions?: ?boolean = false,
   ): Promise<?GraphQLSchema> => {
-    const projectConfig = this._graphQLConfig.getProjectConfig(appName);
-
-    if (!projectConfig) {
-      return null;
-    }
-
-    const projectName = appName || 'undefinedName';
+    const projectName = projectConfig.projectName || 'undefinedName';
     const schemaPath = projectConfig.schemaPath;
     const endpointInfo = this._getDefaultEndpoint(projectConfig);
 
@@ -678,7 +680,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
     const customDirectives = projectConfig.extensions.customDirectives;
     if (customDirectives && schema) {
       const directivesSDL = customDirectives.join('\n\n');
-      schema = extendSchema(schema, parse(directivesSDL));
+      schema = extendSchema(schema, parse(directivesSDL, projectConfig.parseOptions));
     }
 
     if (!schema) {
@@ -826,6 +828,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
    */
   promiseToReadGraphQLFile = (
     filePath: Uri,
+    projectConfig: GraphQLProjectConfig,
   ): Promise<{
     filePath: Uri,
     content: string,
@@ -850,7 +853,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
               return;
             }
 
-            queries.forEach(({query}) => asts.push(parse(query)));
+            queries.forEach(({query}) => asts.push(parse(query, projectConfig.parseOptions)));
           } catch (_) {
             // If query has syntax errors, go ahead and still resolve
             // the filePath and the content, but leave ast empty.
diff --git a/packages/types/src/index.js b/packages/types/src/index.js
index d136cf9d..c676f3fb 100644
--- a/packages/types/src/index.js
+++ b/packages/types/src/index.js
@@ -87,6 +87,7 @@ export interface GraphQLCache {
   getObjectTypeDependencies: (
     query: string,
     fragmentDefinitions: ?Map<string, ObjectTypeInfo>,
+    projectConfig: GraphQLProjectConfig,
   ) => Promise<Array<ObjectTypeInfo>>;
 
   getObjectTypeDependenciesForAST: (
@@ -95,24 +96,27 @@ export interface GraphQLCache {
   ) => Promise<Array<ObjectTypeInfo>>;
 
   getObjectTypeDefinitions: (
-    graphQLConfig: GraphQLProjectConfig,
+    projectConfig: GraphQLProjectConfig,
   ) => Promise<Map<string, ObjectTypeInfo>>;
 
   +updateObjectTypeDefinition: (
     rootDir: Uri,
     filePath: Uri,
     contents: Array<CachedContent>,
+    projectConfig: GraphQLProjectConfig,
   ) => Promise<void>;
 
   +updateObjectTypeDefinitionCache: (
     rootDir: Uri,
     filePath: Uri,
     exists: boolean,
+    projectConfig: GraphQLProjectConfig,
   ) => Promise<void>;
 
   getFragmentDependencies: (
     query: string,
     fragmentDefinitions: ?Map<string, FragmentInfo>,
+    projectConfig: GraphQLProjectConfig,
   ) => Promise<Array<FragmentInfo>>;
 
   getFragmentDependenciesForAST: (
@@ -121,23 +125,25 @@ export interface GraphQLCache {
   ) => Promise<Array<FragmentInfo>>;
 
   getFragmentDefinitions: (
-    graphQLConfig: GraphQLProjectConfig,
+    projectConfig: GraphQLProjectConfig,
   ) => Promise<Map<string, FragmentInfo>>;
 
   +updateFragmentDefinition: (
     rootDir: Uri,
     filePath: Uri,
     contents: Array<CachedContent>,
+    projectConfig: GraphQLProjectConfig,
   ) => Promise<void>;
 
   +updateFragmentDefinitionCache: (
     rootDir: Uri,
     filePath: Uri,
     exists: boolean,
+    projectConfig: GraphQLProjectConfig,
   ) => Promise<void>;
 
   getSchema: (
-    appName: ?string,
+    projectConfig: GraphQLProjectConfig,
     queryHasExtensions?: ?boolean,
   ) => Promise<?GraphQLSchema>;