WIP: Allow passing ParseOptions to parse() with GraphQL Language Server

I want to pass some ParseOptions. The obvious way to do this is to specify it in `.graphqlconfig` and make graphql-language-service pick this up and respect it.

This is only a start. I haven't figured out the cleanest way to pass this to `GraphQLCache`. That will come next.

Author: adamjernst

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.projectName,
     );
     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.
@@ -205,7 +206,7 @@ export class GraphQLLanguageService {
 
     let ast;
     try {
-      ast = parse(query);
+      ast = parse(query, projectConfig.parseOptions);
     } catch (error) {
       return null;
     }

packages/server/src/GraphQLCache.js

@@ -83,7 +83,13 @@ export class GraphQLCache implements GraphQLCacheInterface {
   getFragmentDependencies = async (
     query: string,
     fragmentDefinitions: ?Map<string, FragmentInfo>,
+    projectName: ?string,
   ): Promise<Array<FragmentInfo>> => {
+    const projectConfig = this._graphQLConfig.getProjectConfig(projectName);
+    if (projectConfig == null) {
+      return [];
+    }
+
     // If there isn't context for fragment references,
     // return an empty array.
     if (!fragmentDefinitions) {
@@ -93,7 +99,7 @@ export class GraphQLCache implements GraphQLCacheInterface {
     // Return an empty array.
     let parsedQuery;
     try {
-      parsedQuery = parse(query);
+      parsedQuery = parse(query, projectConfig.parseOptions);
     } catch (error) {
       return [];
     }

packages/types/src/index.js

@@ -113,6 +113,7 @@ export interface GraphQLCache {
   getFragmentDependencies: (
     query: string,
     fragmentDefinitions: ?Map<string, FragmentInfo>,
+    projectName: ?string,
   ) => Promise<Array<FragmentInfo>>;
 
   getFragmentDependenciesForAST: (