add support for disabling adapters (#38542)

docs/docs/how-to/previews-deploys-hosting/adapters.md

@@ -30,6 +30,13 @@ Can't find an adapter for your platform? Consider [creating an adapter](/docs/ho
 
 ## Using adapters
 
+If you use one of the [supported deployment platforms](/docs/how-to/previews-deploys-hosting/zero-configuration-deployments/#supported-deployment-platforms), Gatsby's [zero-configuration deployments](/docs/how-to/previews-deploys-hosting/zero-configuration-deployments/) will automatically install and use the correct adapter when you deploy your project.
+
+If would like to use a custom adapter, specify adapter options or disable adapters, you can do so via the [Gatsby Config API](/docs/reference/config-files/gatsby-config/#adapter).
+
+> [!NOTE]
+> If you plan on staying on a specific deployment platform, it is recommended to install the platform adapter to your `dependencies` as it will give you faster and more robust installs.
+
 Use the `adapter` option inside `gatsby-config`:
 
 ```js:title=gatsby-config.js
@@ -52,6 +59,19 @@ module.exports = {
 }
 ```
 
+## Disabling Adapters
+
+> [!NOTE}
+> Support for disabling adapters was added in `gatsby@5.12.5`.
+
+Use the `adapter` option inside `gatsby-config`:
+
+```js:title=gatsby-config.js
+module.exports = {
+  adapter: false
+}
+```
+
 ## Additional resources
 
 - [Zero-Configuration Deployments](/docs/how-to/previews-deploys-hosting/zero-configuration-deployments/)

docs/docs/how-to/previews-deploys-hosting/zero-configuration-deployments.md

@@ -16,12 +16,14 @@ Gatsby currently supports these platforms for zero-configuration deployments:
 
 ### Manually installing the adapter
 
-If you plan on staying on a specific deployment platform, consider installing the adapter to your `dependencies`. This will give you faster and more robust installs.
-
 If your adapter provides options that you can set, you must manually install the adapter to your `dependencies` to change any of the values. Read the [adapters guide](/docs/how-to/previews-deploys-hosting/adapters/) to learn how to use an adapter.
 
 If you plan on using a specific deployment platform for a long period of time, you may also want to install the adapter to your `dependencies`. This will give you faster and more robust installs.
 
+### Disabling adapters
+
+Zero-configuration deployments are intended to simplify and improve the build and deploy experience. However, if you find that you need more control over your process, you can [disable adapters](/docs/how-to/previews-deploys-hosting/adapters/#disabling-adapters).
+
 ## Adding additional adapters
 
 Gatsby's zero-configuration deployment setup is controlled through an [`adapters.js`](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby/adapters.js) file. If you followed the [Creating an Adapter guide](/docs/how-to/previews-deploys-hosting/creating-an-adapter/) and want to add your adapter to this manifest, you can open a pull request.

docs/docs/reference/config-files/gatsby-config.md

@@ -230,7 +230,7 @@ By default, `graphqlTypegen` is only run during `gatsby develop`. Set this optio
 
 > Support added in `gatsby@5.12.0`
 
-You can set an [adapter](/docs/how-to/previews-deploys-hosting/adapters/) or configure [zero-configuration deployments](/docs/how-to/previews-deploys-hosting/zero-configuration-deployments/) through the `adapter` setting.
+You can set an [adapter](/docs/how-to/previews-deploys-hosting/adapters/), [disable adapters](/docs/how-to/previews-deploys-hosting/adapters/#disabling-adapters), or configure [zero-configuration deployments](/docs/how-to/previews-deploys-hosting/zero-configuration-deployments/) through the `adapter` setting.
 
 ```js:title=gatsby-config.js
 const adapter = require("gatsby-adapter-foo")
@@ -242,6 +242,14 @@ module.exports = {
 }
 ```
 
+> Support added in `gatsby@5.12.5`
+
+```js:title=gatsby-config.js
+module.exports = {
+  adapter: false // disable adapters
+}
+```
+
 Read the [adapters guide](/docs/how-to/previews-deploys-hosting/adapters/) to learn more.
 
 ## headers

packages/gatsby/index.d.ts

@@ -391,7 +391,7 @@ export interface GatsbyConfig {
    * Adapters are responsible for taking the production output from Gatsby and turning it into something your deployment platform understands. They make it easier to build and deploy Gatsby on any deployment platform.
    * @see http://www.gatsbyjs.com/docs/how-to/previews-deploys-hosting/adapters/
    */
-  adapter?: IAdapter
+  adapter?: IAdapter | false
 }
 
 /**

packages/gatsby/src/joi-schemas/__tests__/joi.ts

@@ -344,14 +344,24 @@ describe(`gatsby config`, () => {
     expect(result.value?.adapter).toEqual(config.adapter)
   })
 
+  it(`lets you disable adapters`, () => {
+    const config = {
+      adapter: false,
+    }
+
+    const result = gatsbyConfigSchema.validate(config)
+    expect(result.error).toBeNil()
+    expect(result.value?.adapter).toEqual(config.adapter)
+  })
+
   it(`throws on incorrect adapter setting`, () => {
     const configOne = {
       adapter: `gatsby-adapter-name`,
     }
 
     const resultOne = gatsbyConfigSchema.validate(configOne)
     expect(resultOne.error).toMatchInlineSnapshot(
-      `[ValidationError: "adapter" must be of type object]`
+      `[ValidationError: "adapter" must be one of [false, object]]`
     )
 
     const configTwo = {
@@ -364,6 +374,15 @@ describe(`gatsby config`, () => {
     expect(resultTwo.error).toMatchInlineSnapshot(
       `[ValidationError: "adapter.adapt" is required]`
     )
+
+    const configThree = {
+      adapter: true,
+    }
+
+    const resultThree = gatsbyConfigSchema.validate(configThree)
+    expect(resultThree.error).toMatchInlineSnapshot(
+      `[ValidationError: "adapter" must be one of [false, object]]`
+    )
   })
 })
 

packages/gatsby/src/joi-schemas/joi.ts

@@ -103,19 +103,22 @@ export const gatsbyConfigSchema: Joi.ObjectSchema<IGatsbyConfig> = Joi.object()
           .unknown(false)
       )
       .default([]),
-    adapter: Joi.object()
-      .keys({
-        name: Joi.string().required(),
-        cache: Joi.object()
-          .keys({
-            restore: Joi.func(),
-            store: Joi.func(),
-          })
-          .unknown(false),
-        adapt: Joi.func().required(),
-        config: Joi.func(),
-      })
-      .unknown(false),
+    adapter: Joi.alternatives(
+      Joi.boolean().valid(false),
+      Joi.object()
+        .keys({
+          name: Joi.string().required(),
+          cache: Joi.object()
+            .keys({
+              restore: Joi.func(),
+              store: Joi.func(),
+            })
+            .unknown(false),
+          adapt: Joi.func().required(),
+          config: Joi.func(),
+        })
+        .unknown(false)
+    ),
   })
   // throws when both assetPrefix and pathPrefix are defined
   .when(

packages/gatsby/src/redux/types.ts

@@ -141,7 +141,7 @@ export interface IGatsbyConfig {
   trailingSlash?: TrailingSlash
   graphqlTypegen?: IGraphQLTypegenOptions
   headers?: Array<IHeader>
-  adapter?: IAdapter
+  adapter?: IAdapter | false
 }
 
 export interface IGatsbyNode {

packages/gatsby/src/utils/adapter/__tests__/manager.ts

@@ -3,9 +3,12 @@ import {
   getRoutesManifest,
   getFunctionsManifest,
   setWebpackAssets,
+  initAdapterManager,
 } from "../manager"
 import { state as stateDefault } from "./fixtures/state"
 import { IGatsbyState } from "../../../internal"
+import { IAdapterManager, IAdapter } from "../types"
+import { getAdapterInit } from "../init"
 
 jest.mock(`../../../redux`, () => {
   return {
@@ -14,6 +17,7 @@ jest.mock(`../../../redux`, () => {
     },
     store: {
       getState: jest.fn(),
+      dispatch: jest.fn(),
     },
   }
 })
@@ -25,6 +29,34 @@ jest.mock(`../../engines-helpers`, () => {
   }
 })
 
+jest.mock(`../init`)
+
+const createAdapterMock = (): IAdapter => {
+  return {
+    name: `gatsby-adapter-mock`,
+    adapt: jest.fn(),
+    config: jest.fn().mockReturnValue({}),
+  }
+}
+
+const mockNoOpAdapterManager: IAdapterManager = {
+  adapt: jest.fn(),
+  restoreCache: jest.fn(),
+  storeCache: jest.fn(),
+  config: jest.fn().mockResolvedValue({
+    excludeDatastoreFromEngineFunction: false,
+    pluginsToDisable: [],
+  }),
+}
+
+jest.mock(`../no-op-manager`, () => {
+  return {
+    noOpAdapterManager: jest
+      .fn()
+      .mockImplementation(() => mockNoOpAdapterManager),
+  }
+})
+
 function mockStoreState(
   state: IGatsbyState,
   additionalState: Partial<IGatsbyState> = {}
@@ -33,6 +65,12 @@ function mockStoreState(
   ;(store.getState as jest.Mock).mockReturnValue(mergedState)
 }
 
+function mockGetAdapterInit(adapter: IAdapter | undefined): void {
+  const mocked = getAdapterInit as jest.MockedFunction<typeof getAdapterInit>
+  mocked.mockClear()
+  mocked.mockResolvedValue(adapter ? (): IAdapter => adapter : undefined)
+}
+
 const fixturesDir = `${__dirname}/fixtures`
 
 let cwdToRestore
@@ -127,3 +165,61 @@ describe(`getFunctionsManifest`, () => {
     `)
   })
 })
+
+describe(`initAdapterManager`, () => {
+  beforeEach(() => {
+    ;(mockNoOpAdapterManager.config as jest.Mock).mockClear()
+  })
+
+  it(`should use noop manager when adapter config is false`, async () => {
+    const initAdapter = createAdapterMock()
+    mockStoreState(stateDefault, {
+      config: { ...stateDefault.config, adapter: false },
+    })
+    mockGetAdapterInit(initAdapter)
+    const mgr = await initAdapterManager()
+
+    expect(mgr).not.toBeNull()
+    expect(mockNoOpAdapterManager.config).toHaveBeenCalledTimes(1)
+    expect(initAdapter.config).not.toHaveBeenCalled()
+  })
+
+  it(`should use noop manager when adapter config is undefined and no adapter resolved`, async () => {
+    mockStoreState(stateDefault, {
+      config: { ...stateDefault.config, adapter: undefined },
+    })
+    mockGetAdapterInit(undefined)
+    const mgr = await initAdapterManager()
+
+    expect(mgr).not.toBeNull()
+    expect(mockNoOpAdapterManager.config).toHaveBeenCalledTimes(1)
+  })
+
+  it(`should use configured adapter`, async () => {
+    const configuredAdapter = createAdapterMock()
+    const initAdapter = createAdapterMock()
+    mockStoreState(stateDefault, {
+      config: { ...stateDefault.config, adapter: configuredAdapter },
+    })
+    mockGetAdapterInit(initAdapter)
+    const mgr = await initAdapterManager()
+
+    expect(mgr).not.toBeNull()
+    expect(mockNoOpAdapterManager.config).not.toHaveBeenCalled()
+    expect(initAdapter.config).not.toHaveBeenCalled()
+    expect(configuredAdapter.config).toHaveBeenCalledTimes(1)
+  })
+
+  it(`should use resolved adapter when adapter config is undefined`, async () => {
+    const initAdapter = createAdapterMock()
+    mockStoreState(stateDefault, {
+      config: { ...stateDefault.config, adapter: undefined },
+    })
+    mockGetAdapterInit(initAdapter)
+    const mgr = await initAdapterManager()
+
+    expect(mgr).not.toBeNull()
+    expect(mockNoOpAdapterManager.config).not.toHaveBeenCalled()
+    expect(initAdapter.config).toBeCalled()
+  })
+})

packages/gatsby/src/utils/adapter/manager.ts

@@ -129,7 +129,8 @@ export async function initAdapterManager(): Promise<IAdapterManager> {
 
     reporter.verbose(`Using adapter ${adapter.name} from gatsby-config`)
   } else {
-    const adapterInit = await getAdapterInit()
+    const adapterInit =
+      adapterFromGatsbyConfig === false ? false : await getAdapterInit()
 
     // If we don't have adapter, use no-op adapter manager
     if (!adapterInit) {