fix: add dataLoaderOptions to gatsby-source-graphql

Author: Matthew Rumery

packages/gatsby-source-graphql/src/gatsby-node.js

@@ -27,6 +27,19 @@ exports.pluginOptionsSchema = ({ Joi }) =>
     createSchema: Joi.function(),
     batch: Joi.boolean(),
     transformSchema: Joi.function(),
+    dataLoaderOptions: Joi.object({
+      batch: Joi.boolean(),
+      maxBatchSize: Joi.number(),
+      batchScheduleFn: Joi.function(),
+      cache: Joi.boolean(),
+      cacheKeyFn: Joi.function(),
+      cacheMap: Joi.object({
+        get: Joi.function(),
+        set: Joi.function(),
+        delete: Joi.function(),
+        clear: Joi.function(),
+      }),
+    })
   }).or(`url`, `createLink`)
 
 exports.createSchemaCustomization = async (
@@ -101,17 +114,17 @@ exports.createSchemaCustomization = async (
 
   const schema = transformSchema
     ? transformSchema({
-        schema: introspectionSchema,
-        link,
-        resolver,
-        defaultTransforms,
-        options,
-      })
+      schema: introspectionSchema,
+      link,
+      resolver,
+      defaultTransforms,
+      options,
+    })
     : wrapSchema({
-        schema: introspectionSchema,
-        executor: linkToExecutor(link),
-        transforms: defaultTransforms,
-      })
+      schema: introspectionSchema,
+      executor: linkToExecutor(link),
+      transforms: defaultTransforms,
+    })
 
   addThirdPartySchema({ schema })
 }