prototype easy stateless preview

packages/cli/oclif.manifest.json

@@ -7979,6 +7979,71 @@
       "strict": true,
       "summary": "Renames an existing theme."
     },
+    "theme:sandbox-preview": {
+      "aliases": [
+      ],
+      "args": {
+      },
+      "customPluginName": "@shopify/theme",
+      "description": "Starts an authless, one-shot sandbox preview using \"mock.shop\" (https://mock.shop/).\n\nThis prototype writes a local launcher page and opens it in your browser. The launcher then POSTs the override payload directly to the target storefront to render an initial preview.\n\n- No store authentication is required\n- No preview is persisted\n- Navigation after the first page load will not preserve overrides",
+      "descriptionWithMarkdown": "Starts an authless, one-shot sandbox preview using [mock.shop](https://mock.shop/).\n\nThis prototype writes a local launcher page and opens it in your browser. The launcher then POSTs the override payload directly to the target storefront to render an initial preview.\n\n- No store authentication is required\n- No preview is persisted\n- Navigation after the first page load will not preserve overrides",
+      "enableJsonFlag": false,
+      "flags": {
+        "no-color": {
+          "allowNo": false,
+          "description": "Disable color output.",
+          "env": "SHOPIFY_FLAG_NO_COLOR",
+          "hidden": false,
+          "name": "no-color",
+          "type": "boolean"
+        },
+        "no-open": {
+          "allowNo": false,
+          "description": "Do not automatically launch the local storefront preview launcher in your default web browser.",
+          "env": "SHOPIFY_FLAG_NO_OPEN",
+          "name": "no-open",
+          "type": "boolean"
+        },
+        "overrides": {
+          "description": "Path to a JSON overrides file.",
+          "env": "SHOPIFY_FLAG_OVERRIDES",
+          "hasDynamicHelp": false,
+          "multiple": false,
+          "name": "overrides",
+          "required": true,
+          "type": "option"
+        },
+        "storefront-url": {
+          "description": "Override the storefront preview target. Useful for local SFR testing.",
+          "env": "SHOPIFY_FLAG_STOREFRONT_URL",
+          "hasDynamicHelp": false,
+          "multiple": false,
+          "name": "storefront-url",
+          "required": false,
+          "type": "option"
+        },
+        "verbose": {
+          "allowNo": false,
+          "description": "Increase the verbosity of the output.",
+          "env": "SHOPIFY_FLAG_VERBOSE",
+          "hidden": false,
+          "name": "verbose",
+          "type": "boolean"
+        }
+      },
+      "hasDynamicHelp": false,
+      "hiddenAliases": [
+      ],
+      "id": "theme:sandbox-preview",
+      "pluginAlias": "@shopify/cli",
+      "pluginName": "@shopify/cli",
+      "pluginType": "core",
+      "strict": true,
+      "summary": "Opens a one-shot authless mock.shop sandbox preview from a JSON overrides file.",
+      "usage": [
+        "theme sandbox-preview --overrides path/to/overrides.json"
+      ]
+    },
     "theme:serve": {
       "aliases": [
       ],

packages/theme/src/cli/commands/theme/preview/mock.ts

@@ -0,0 +1,50 @@
+import {devWithOverrideFile} from '../../../services/dev-override.js'
+import {Flags} from '@oclif/core'
+import Command from '@shopify/cli-kit/node/base-command'
+import {globalFlags} from '@shopify/cli-kit/node/cli'
+
+export default class PreviewMock extends Command {
+  static summary = 'Opens a one-shot authless mock.shop sandbox preview from a JSON overrides file.'
+
+  static usage = ['theme preview mock --overrides path/to/overrides.json']
+
+  static descriptionWithMarkdown = `Starts an authless, one-shot sandbox preview using [mock.shop](https://mock.shop/).
+
+This prototype writes a local launcher page and opens it in your browser. The launcher then POSTs the override payload directly to the target storefront to render an initial preview.
+
+- No store authentication is required
+- No preview is persisted
+- Navigation after the first page load will not preserve overrides`
+
+  static description = this.descriptionWithoutMarkdown()
+
+  static flags = {
+    ...globalFlags,
+    overrides: Flags.string({
+      description: 'Path to a JSON overrides file.',
+      env: 'SHOPIFY_FLAG_OVERRIDES',
+      required: true,
+    }),
+    open: Flags.boolean({
+      description: 'Automatically launch the local storefront preview launcher in your default web browser.',
+      env: 'SHOPIFY_FLAG_OPEN',
+      default: true,
+    }),
+    'storefront-url': Flags.string({
+      description: 'Override the storefront preview target. Useful for local SFR testing.',
+      env: 'SHOPIFY_FLAG_STOREFRONT_URL',
+      required: false,
+    }),
+  }
+
+  async run(): Promise<void> {
+    const {flags} = await this.parse(PreviewMock)
+
+    await devWithOverrideFile({
+      overrideJson: flags.overrides,
+      open: flags.open,
+      mockShop: true,
+      mockShopStorefrontUrl: flags['storefront-url'],
+    })
+  }
+}

packages/theme/src/cli/commands/theme/sandbox-preview.test.ts

@@ -0,0 +1,53 @@
+import SandboxPreview from './sandbox-preview.js'
+import {devWithOverrideFile} from '../../services/dev-override.js'
+import {Config} from '@oclif/core'
+import {describe, vi, expect, test, beforeEach} from 'vitest'
+
+vi.mock('../../services/dev-override.js')
+
+const CommandConfig = new Config({root: __dirname})
+
+describe('SandboxPreview', () => {
+  beforeEach(() => {
+    vi.mocked(devWithOverrideFile).mockResolvedValue(undefined)
+  })
+
+  async function run(argv: string[]) {
+    await CommandConfig.load()
+    const command = new SandboxPreview(argv, CommandConfig)
+    await command.run()
+  }
+
+  test('calls devWithOverrideFile in authless mock.shop mode', async () => {
+    await run(['--overrides=/path/to/overrides.json'])
+
+    expect(devWithOverrideFile).toHaveBeenCalledWith({
+      overrideJson: '/path/to/overrides.json',
+      open: true,
+      mockShop: true,
+      mockShopStorefrontUrl: undefined,
+    })
+  })
+
+  test('passes through --no-open when provided', async () => {
+    await run(['--overrides=/path/to/overrides.json', '--no-open'])
+
+    expect(devWithOverrideFile).toHaveBeenCalledWith({
+      overrideJson: '/path/to/overrides.json',
+      open: false,
+      mockShop: true,
+      mockShopStorefrontUrl: undefined,
+    })
+  })
+
+  test('passes through a custom storefront URL when provided', async () => {
+    await run(['--overrides=/path/to/overrides.json', '--storefront-url=http://localhost:3000'])
+
+    expect(devWithOverrideFile).toHaveBeenCalledWith({
+      overrideJson: '/path/to/overrides.json',
+      open: true,
+      mockShop: true,
+      mockShopStorefrontUrl: 'http://localhost:3000',
+    })
+  })
+})

packages/theme/src/cli/commands/theme/sandbox-preview.ts

@@ -0,0 +1,50 @@
+import {devWithOverrideFile} from '../../services/dev-override.js'
+import {Flags} from '@oclif/core'
+import Command from '@shopify/cli-kit/node/base-command'
+import {globalFlags} from '@shopify/cli-kit/node/cli'
+
+export default class SandboxPreview extends Command {
+  static summary = 'Opens a one-shot authless mock.shop sandbox preview from a JSON overrides file.'
+
+  static usage = ['theme sandbox-preview --overrides path/to/overrides.json']
+
+  static descriptionWithMarkdown = `Starts an authless, one-shot sandbox preview using [mock.shop](https://mock.shop/).
+
+This prototype writes a local launcher page and opens it in your browser. The launcher then POSTs the override payload directly to the target storefront to render an initial preview.
+
+- No store authentication is required
+- No preview is persisted
+- Navigation after the first page load will not preserve overrides`
+
+  static description = this.descriptionWithoutMarkdown()
+
+  static flags = {
+    ...globalFlags,
+    overrides: Flags.string({
+      description: 'Path to a JSON overrides file.',
+      env: 'SHOPIFY_FLAG_OVERRIDES',
+      required: true,
+    }),
+    'no-open': Flags.boolean({
+      description: 'Do not automatically launch the local storefront preview launcher in your default web browser.',
+      env: 'SHOPIFY_FLAG_NO_OPEN',
+      default: false,
+    }),
+    'storefront-url': Flags.string({
+      description: 'Override the storefront preview target. Useful for local SFR testing.',
+      env: 'SHOPIFY_FLAG_STOREFRONT_URL',
+      required: false,
+    }),
+  }
+
+  async run(): Promise<void> {
+    const {flags} = await this.parse(SandboxPreview)
+
+    await devWithOverrideFile({
+      overrideJson: flags.overrides,
+      open: !flags['no-open'],
+      mockShop: true,
+      mockShopStorefrontUrl: flags['storefront-url'],
+    })
+  }
+}

packages/theme/src/cli/services/dev-override.test.ts

@@ -2,13 +2,15 @@ import {devWithOverrideFile} from './dev-override.js'
 import {openURLSafely} from './dev.js'
 import {fetchDevServerSession} from '../utilities/theme-environment/dev-server-session.js'
 import {createThemePreview, updateThemePreview} from '../utilities/theme-previews/preview.js'
+import {startMockShopPreviewSession} from '../utilities/theme-previews/mock-shop.js'
 import {describe, expect, test, vi} from 'vitest'
 import {renderSuccess} from '@shopify/cli-kit/node/ui'
 import {collectedLogs, clearCollectedLogs} from '@shopify/cli-kit/node/output'
 import {fileExistsSync, readFile} from '@shopify/cli-kit/node/fs'
 
 vi.mock('../utilities/theme-environment/dev-server-session.js')
 vi.mock('../utilities/theme-previews/preview.js')
+vi.mock('../utilities/theme-previews/mock-shop.js')
 vi.mock('./dev.js', () => ({openURLSafely: vi.fn()}))
 vi.mock('@shopify/cli-kit/node/ui')
 vi.mock('@shopify/cli-kit/node/fs')
@@ -22,6 +24,9 @@ const mockSession = {
 }
 const expectedPreviewUrl = 'https://abc123.shopifypreview.com'
 const expectedPreviewId = 'abc123'
+const mockShopLauncherUrl = 'file:///tmp/mock-shop-preview.html'
+const mockShopTargetUrl = 'https://demostore.mock.shop/?theme_preview'
+const customMockShopTargetUrl = 'http://localhost:3000/?theme_preview'
 
 describe('devWithOverrideFile', () => {
   test('throws when override file does not exist', async () => {
@@ -208,4 +213,86 @@ describe('devWithOverrideFile', () => {
     // Then
     expect(renderSuccess).toHaveBeenCalled()
   })
+
+  test('starts a one-shot mock.shop preview when mockShop is enabled', async () => {
+    vi.mocked(fileExistsSync).mockReturnValue(true)
+    vi.mocked(readFile).mockResolvedValue(Buffer.from(JSON.stringify({templates: {}})))
+    vi.mocked(startMockShopPreviewSession).mockResolvedValue({
+      launcherUrl: mockShopLauncherUrl,
+      targetUrl: mockShopTargetUrl,
+      completion: Promise.resolve(),
+    })
+
+    await devWithOverrideFile({adminSession, overrideJson: '/overrides.json', open: false, mockShop: true})
+
+    expect(startMockShopPreviewSession).toHaveBeenCalledWith(JSON.stringify({templates: {}}), {
+      storefrontUrl: undefined,
+    })
+    expect(fetchDevServerSession).not.toHaveBeenCalled()
+    expect(createThemePreview).not.toHaveBeenCalled()
+    expect(updateThemePreview).not.toHaveBeenCalled()
+    expect(renderSuccess).toHaveBeenCalledWith(
+      expect.objectContaining({
+        body: [
+          {
+            list: {
+              title: 'Mock.shop preview is ready',
+              items: [{link: {url: mockShopLauncherUrl}}, `Target: ${mockShopTargetUrl}`, 'This prototype opens an initial preview only.'],
+            },
+          },
+        ],
+      }),
+    )
+  })
+
+  test('opens the launcher URL for a mock.shop preview', async () => {
+    vi.mocked(fileExistsSync).mockReturnValue(true)
+    vi.mocked(readFile).mockResolvedValue(Buffer.from(JSON.stringify({templates: {}})))
+    vi.mocked(startMockShopPreviewSession).mockResolvedValue({
+      launcherUrl: mockShopLauncherUrl,
+      targetUrl: mockShopTargetUrl,
+      completion: Promise.resolve(),
+    })
+
+    await devWithOverrideFile({adminSession, overrideJson: '/overrides.json', open: true, mockShop: true})
+
+    expect(openURLSafely).toHaveBeenCalledWith(mockShopLauncherUrl, 'mock.shop preview')
+  })
+
+  test('passes through a custom storefront URL in mock.shop mode', async () => {
+    vi.mocked(fileExistsSync).mockReturnValue(true)
+    vi.mocked(readFile).mockResolvedValue(Buffer.from(JSON.stringify({templates: {}})))
+    vi.mocked(startMockShopPreviewSession).mockResolvedValue({
+      launcherUrl: mockShopLauncherUrl,
+      targetUrl: customMockShopTargetUrl,
+      completion: Promise.resolve(),
+    })
+
+    await devWithOverrideFile({
+      adminSession,
+      overrideJson: '/overrides.json',
+      open: false,
+      mockShop: true,
+      mockShopStorefrontUrl: 'http://localhost:3000',
+    })
+
+    expect(startMockShopPreviewSession).toHaveBeenCalledWith(JSON.stringify({templates: {}}), {
+      storefrontUrl: 'http://localhost:3000',
+    })
+  })
+
+  test('rejects preview IDs in mock.shop mode', async () => {
+    vi.mocked(fileExistsSync).mockReturnValue(true)
+    vi.mocked(readFile).mockResolvedValue(Buffer.from(JSON.stringify({templates: {}})))
+
+    await expect(
+      devWithOverrideFile({
+        adminSession,
+        overrideJson: '/overrides.json',
+        open: false,
+        mockShop: true,
+        previewIdentifier: 'abc123',
+      }),
+    ).rejects.toThrow('The --preview-id flag is not supported with --mock-shop.')
+  })
 })