Add resolveQueryFromOperation and JSDoc comments

index.js

@@ -4,7 +4,14 @@ const { makeExecutableSchema, addMockFunctionsToSchema } = require('graphql-tool
 const { graphql, printSchema, buildClientSchema } = require('graphql');
 const RelayMockNetworkLayerError = require('./RelayMockNetworkLayerError');
 
-module.exports = function getNetworkLayer({ schema, mocks, resolvers }) {
+/**
+ * @param {Object} networkConfig - The configuration for the mock network layer.
+ * @param {(string|Object)} networkConfig.schema - If string, the graphql schema SDL. If object, the JSON introspection query.
+ * @param {Object} networkConfig.mocks - Mock primative resolvers, passed directly to addMockFunctionsToSchema.
+ * @param {Object} networkConfig.resolvers - Default resolvers for a schema.
+ * @param {Object} [networkConfig.resolveQueryFromOperation] - If relay operation query text does not exist, used to resolve the query from the operation. Useful for persisted query support.
+ */
+function getNetworkLayer({ schema, mocks, resolvers, resolveQueryFromOperation }) {
     return function fetchQuery(operation, variableValues) {
         if (typeof schema === 'object' && schema.data) {
             schema = printSchema(buildClientSchema(schema.data));
@@ -15,7 +22,16 @@ module.exports = function getNetworkLayer({ schema, mocks, resolvers }) {
         // Add mocks, modifies schema in place
         addMockFunctionsToSchema({ schema: executableSchema, mocks });
 
-        return graphql(executableSchema, operation.text, null, null, variableValues).then(
+        const query =
+            (resolveQueryFromOperation && resolveQueryFromOperation(operation)) || operation.text;
+
+        if (!query) {
+            throw new Error(
+                'Could not find query, ensure operation.text exists or pass resolveQueryFromOperation.'
+            );
+        }
+
+        return graphql(executableSchema, query, null, null, variableValues).then(
             // Trigger Relay error in case of GraphQL errors (or errors in mutation response)
             // See https://github.com/facebook/relay/issues/1816
 
@@ -27,4 +43,6 @@ module.exports = function getNetworkLayer({ schema, mocks, resolvers }) {
             }
         );
     };
-};
+}
+
+module.exports = getNetworkLayer;