GraphQL Mesh will now be in read-only mode by default, so only a sing…

…le instance is created globally

.changeset/strange-turkeys-sort.md

@@ -0,0 +1,5 @@
+---
+'@graphcommerce/graphql-mesh': patch
+---
+
+GraphQL Mesh will now be in read-only mode by default, so only a single instance is created globally. This means it doesn't get recreated on each page compilation and fast refresh. Creating the instance is an expensive operation and can take multiple seconds and during development (and this can happen multiple times during a single change). Now only a single instance is created during development. To make sure changes are picked up during development set the config value `graphqlMeshEditMode: true` in your graphcommerce.config.js or set the env variable `GC_GRAPHQL_MESH_EDIT_MODE=1`. This _will_ make the frontend considerably slower.

docs/framework/config.md

@@ -251,6 +251,11 @@ The Google Tagmanager ID to be used on the site.
 
 This value is required even if you are configuring different values for each locale.
 
+#### graphqlMeshEditMode: boolean = `false`
+
+The GraphQL Mesh will be loaded once and any modifications to resolvers will be ignored. When developing
+new resolvers this should be set to true.
+
 #### hygraphManagementApi: string
 
 Hygraph Management API. **Only used for migrations.**

docs/framework/mesh.md

@@ -27,7 +27,8 @@ To make modifications to the Mesh configuration, you can:
 ### Modify the meshrc.yaml:
 
 You can always modify the base configuration of the Mesh by modifying the
-`meshrc.yaml` file.
+`meshrc.yaml` file. After making always run `yarn codegen` (this can be in a
+separate terminal and nextjs will reload it).
 
 ### Write a plugin:
 
@@ -61,6 +62,33 @@ export const meshConfig: FunctionPlugin<typeof meshConfigBase> = (
         },
       },
     ],
+    additionalResolvers: [
+      ...(baseConfig.additionalResolvers ?? []),
+      'lib/resolvers/my-feature.ts',
+    ],
   })
 }
 ```
+
+### Creating additional schema's
+
+During development it might come in handy to write schema extensions even before
+any backend work has been done. `AnyFile.graphqls` in the graphql directory will
+automatically be picked up and merged with the rest of the schema.
+
+### Creating additional resolvers
+
+In the plugin add additionalResolvers and point to your ts file where the
+resolver is.
+
+```tsx
+// This MUST be a type import, else there will be a circular dependency.
+import type { Resolvers } from '@graphcommerce/graphql-mesh'
+
+const resolvers: Resolvers = {}
+```
+
+To make sure changes are picked up during development set the config value
+`graphqlMeshEditMode: true` in your graphcommerce.config.js or set the env
+variable `GC_GRAPHQL_MESH_EDIT_MODE=1`. This _will_ make the frontend
+considerably slower.

packages/cli/dist/bin/mesh.js

@@ -9,8 +9,8 @@ import dotenv from 'dotenv';
 import 'tsx/cjs';
 import 'tsx/esm';
 import yaml from 'yaml';
-import { cosmiconfig, defaultLoaders } from 'cosmiconfig';
 import path from 'path';
+import { cosmiconfig, defaultLoaders } from 'cosmiconfig';
 
 function customLoader(ext, importFn = defaultImportFn, initialLoggerPrefix = "\u{1F578}\uFE0F  Mesh") {
   const logger = new DefaultLogger(initialLoggerPrefix).child("config");
@@ -40,7 +40,7 @@ function customLoader(ext, importFn = defaultImportFn, initialLoggerPrefix = "\u
   return loader;
 }
 async function findConfig(options) {
-  const { configName = "mesh", dir: configDir = "", initialLoggerPrefix } = options || {};
+  const { configName = "mesh", dir: configDir = "", initialLoggerPrefix } = options;
   const dir = path.isAbsolute(configDir) ? configDir : path.join(process.cwd(), configDir);
   const explorer = cosmiconfig(configName, {
     searchPlaces: [
@@ -169,7 +169,14 @@ const main = async () => {
   await promises.writeFile(tmpMeshLocation, yamlString);
   await promises.writeFile(
     `${meshDir}/.mesh.ts`,
-    `export * from '${relativePath.split(path$1.sep).join("/")}.mesh'`,
+    `export type * from '${relativePath.split(path$1.sep).join("/")}.mesh'
+export {
+  getBuiltMesh as getBuiltMeshBase,
+  execute,
+  subscribe,
+  createBuiltMeshHTTPHandler as createBuiltMeshHTTPHandlerBase,
+  rawServeConfig,
+} from '${relativePath.split(path$1.sep).join("/")}.mesh'`,
     { encoding: "utf8" }
   );
   await graphqlMesh({ ...cliParams, configName: tmpMesh });

packages/cli/src/bin/mesh.ts

@@ -165,7 +165,14 @@ const main = async () => {
   // Reexport the mesh to is can be used by packages
   await fs.writeFile(
     `${meshDir}/.mesh.ts`,
-    `export * from '${relativePath.split(path.sep).join('/')}.mesh'`,
+    `export type * from '${relativePath.split(path.sep).join('/')}.mesh'
+export {
+  getBuiltMesh as getBuiltMeshBase,
+  execute,
+  subscribe,
+  createBuiltMeshHTTPHandler as createBuiltMeshHTTPHandlerBase,
+  rawServeConfig,
+} from '${relativePath.split(path.sep).join('/')}.mesh'`,
     { encoding: 'utf8' },
   )
 

packages/graphql-mesh/Config.graphqls

@@ -0,0 +1,7 @@
+extend input GraphCommerceConfig {
+  """
+  The GraphQL Mesh will be loaded once and any modifications to resolvers will be ignored. When developing
+  new resolvers this should be set to true.
+  """
+  graphqlMeshEditMode: Boolean = false
+}

packages/graphql-mesh/api/createEnvelop.ts

@@ -1,13 +1,13 @@
 import type { NextApiRequest, NextApiResponse } from 'next'
-import { createBuiltMeshHTTPHandler } from '../.mesh'
-
-const handler = createBuiltMeshHTTPHandler()
+import { createBuiltMeshHTTPHandler } from './globalThisMesh'
 
 // eslint-disable-next-line @typescript-eslint/require-await
 export const createServer = async (endpoint: string) => {
   if (endpoint !== '/api/graphql')
     throw Error('Moving the GraphQL Endpoint is not supported at the moment')
-  return (req: NextApiRequest, res: NextApiResponse) => {
+
+  const handler = createBuiltMeshHTTPHandler()
+  return async (req: NextApiRequest, res: NextApiResponse) => {
     res.setHeader('Access-Control-Allow-Origin', req.headers.origin || '*')
     const requestedHeaders = req.headers['access-control-request-headers']
     if (requestedHeaders) {
@@ -20,6 +20,6 @@ export const createServer = async (endpoint: string) => {
       return
     }
 
-    handler(req, res)
+    await handler(req, res)
   }
 }

packages/graphql-mesh/api/globalThisMesh.ts

@@ -0,0 +1,55 @@
+import type { MeshInstance } from '@graphql-mesh/runtime'
+import type {
+  ServerAdapter,
+  ServerAdapterBaseObject,
+  ServerAdapterRequestHandler,
+} from '@whatwg-node/server'
+import { createBuiltMeshHTTPHandlerBase, getBuiltMeshBase } from '../.mesh'
+
+type MeshHTTPHandler<TServerContext = Record<string, unknown>> = ServerAdapter<
+  TServerContext,
+  ServerAdapterBaseObject<TServerContext, ServerAdapterRequestHandler<TServerContext>>
+>
+
+declare global {
+  // eslint-disable-next-line vars-on-top, no-var
+  var buildMesh: Promise<MeshInstance> | undefined
+
+  // eslint-disable-next-line vars-on-top, no-var
+  var builtMeshHandler: MeshHTTPHandler | undefined
+}
+
+const shouldGlobalThisMeshBeCreated =
+  process.env.NODE_ENV === 'development' && import.meta.graphCommerce.graphqlMeshEditMode !== true
+
+/**
+ * We are creating a global instance of the mesh so it doesn't get recreated on every change.
+ * Creating the instance is a very long operation and with sufficiently complex schema's it can take
+ * multiple seconds. During development it can happen multiple times during a single change.
+ *
+ * During development this creates a big advantage as we do not recreate the mesh on every reload.
+ * This makes development a lot faster.
+ *
+ * The disadvantage of this is that the mesh and any resolvers custom resolver will not be refreshed
+ * whenever code changes are made, to enable this set the config value `graphqlMeshEditMode: true`
+ * in your graphcommerce.config.js or set the env variable `GC_GRAPHQL_MESH_EDIT_MODE=1`.
+ */
+export function getBuiltMesh() {
+  if (shouldGlobalThisMeshBeCreated) {
+    globalThis.buildMesh ??= getBuiltMeshBase()
+    return globalThis.buildMesh
+  }
+  return getBuiltMeshBase()
+}
+
+/**
+ * Same as globalThisGetBuiltMesh but for the mesh handler. As the handler uses additional logic so
+ * we can't re-use globalThisGetBuiltMesh.
+ */
+export function createBuiltMeshHTTPHandler(): MeshHTTPHandler {
+  if (shouldGlobalThisMeshBeCreated) {
+    globalThis.builtMeshHandler ??= createBuiltMeshHTTPHandlerBase() as MeshHTTPHandler
+    return globalThis.builtMeshHandler
+  }
+  return createBuiltMeshHTTPHandlerBase() as MeshHTTPHandler
+}

packages/graphql-mesh/index.ts

@@ -1,4 +1,5 @@
 export * from './api/createEnvelop'
 export * from './api/apolloLink'
 export * from './.mesh'
+export * from './api/globalThisMesh'
 export * from './utils/traverseSelectionSet'

packages/graphql-mesh/tsconfig.json

@@ -1,5 +1,5 @@
 {
   "exclude": ["**/node_modules", "**/.*/"],
   "include": ["**/*.ts", "**/*.tsx"],
-  "extends": "@graphcommerce/typescript-config-pwa/node.json"
+  "extends": "@graphcommerce/typescript-config-pwa/nextjs.json"
 }

packagesDev/next-config/dist/generated/config.js

@@ -133,6 +133,7 @@ function GraphCommerceConfigSchema() {
         googlePlaystore: GraphCommerceGooglePlaystoreConfigSchema().nullish(),
         googleRecaptchaKey: _zod.z.string().nullish(),
         googleTagmanagerId: _zod.z.string().nullish(),
+        graphqlMeshEditMode: _zod.z.boolean().default(false).nullish(),
         hygraphEndpoint: _zod.z.string().min(1),
         hygraphManagementApi: _zod.z.string().nullish(),
         hygraphProjectId: _zod.z.string().nullish(),

packagesDev/next-config/src/generated/config.ts

@@ -253,6 +253,11 @@ export type GraphCommerceConfig = {
    * This value is required even if you are configuring different values for each locale.
    */
   googleTagmanagerId?: InputMaybe<Scalars['String']['input']>
+  /**
+   * The GraphQL Mesh will be loaded once and any modifications to resolvers will be ignored. When
+   * developing new resolvers this should be set to true.
+   */
+  graphqlMeshEditMode?: InputMaybe<Scalars['Boolean']['input']>
   /**
    * The HyGraph endpoint.> Read-only endpoint that allows low latency and high read-throughput content delivery.
    *
@@ -610,6 +615,7 @@ export function GraphCommerceConfigSchema(): z.ZodObject<Properties<GraphCommerc
     googlePlaystore: GraphCommerceGooglePlaystoreConfigSchema().nullish(),
     googleRecaptchaKey: z.string().nullish(),
     googleTagmanagerId: z.string().nullish(),
+    graphqlMeshEditMode: z.boolean().default(false).nullish(),
     hygraphEndpoint: z.string().min(1),
     hygraphManagementApi: z.string().nullish(),
     hygraphProjectId: z.string().nullish(),