perf(gatsby): reuse rootNode & trackedRootNodes caches across instanc…

…es of graphqlRunner (#33695)

Co-authored-by: gatsbybot <mathews.kyle+gatsbybot@gmail.com>
Co-authored-by: Ward Peeters <ward@coding-tech.com>
Co-authored-by: Khaled Garbaya <kgarbaya@gmail.com>

packages/gatsby/src/query/graphql-runner.ts

@@ -23,6 +23,10 @@ import { IGraphQLRunnerStatResults, IGraphQLRunnerStats } from "./types"
 import { IGraphQLTelemetryRecord } from "../schema/type-definitions"
 import GraphQLSpanTracer from "./graphql-span-tracer"
 
+// Preserve these caches across graphql instances.
+const _rootNodeMap = new WeakMap()
+const _trackedRootNodes = new WeakSet()
+
 type Query = string | Source
 
 export interface IQueryOptions {
@@ -62,6 +66,8 @@ export class GraphQLRunner {
       schema,
       schemaComposer: schemaCustomization.composer,
       createPageDependency,
+      _rootNodeMap,
+      _trackedRootNodes,
     })
     this.schema = schema
     this.parseCache = new Map()

packages/gatsby/src/schema/node-model.js

@@ -71,13 +71,18 @@ export interface NodeModel {
 }
 
 class LocalNodeModel {
-  constructor({ schema, schemaComposer, createPageDependency }) {
+  constructor({
+    schema,
+    schemaComposer,
+    createPageDependency,
+    _rootNodeMap,
+    _trackedRootNodes,
+  }) {
     this.schema = schema
     this.schemaComposer = schemaComposer
     this.createPageDependencyActionCreator = createPageDependency
-
-    this._rootNodeMap = new WeakMap()
-    this._trackedRootNodes = new WeakSet()
+    this._rootNodeMap = _rootNodeMap || new WeakMap()
+    this._trackedRootNodes = _trackedRootNodes || new WeakSet()
     this._prepareNodesQueues = {}
     this._prepareNodesPromises = {}
     this._preparedNodesCache = new Map()