feat(graphiql): add GraphiQL editor with Monaco integration

Adds the core GraphiQL editor component with Monaco language support.

- Integrate GraphiQL library for query editing
- Configure Monaco editor for GraphQL syntax highlighting
- Add tab management for multiple queries
- Inject default queries (welcome message, shop query)
- Include comprehensive tests (252 lines)

All editor tests pass, Monaco workers build correctly

Author: amcaplan

packages/graphiql-console/src/components/GraphiQLEditor/GraphiQLEditor.test.tsx

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+import {GraphiQLEditor} from './GraphiQLEditor.tsx'
+import React from 'react'
+import {render} from '@testing-library/react'
+import {describe, test, expect, vi, beforeEach} from 'vitest'
+import type {GraphiQLConfig} from '@/types/config'
+
+// Mock GraphiQL component
+const mockGraphiQL = vi.fn()
+vi.mock('graphiql', () => ({
+  GraphiQL: (props: any) => {
+    mockGraphiQL(props)
+    return <div data-testid="graphiql-mock" data-tabs-count={props.defaultTabs?.length || 0} />
+  },
+}))
+
+// Mock createGraphiQLFetcher
+const mockCreateFetcher = vi.fn()
+vi.mock('@graphiql/toolkit', () => ({
+  createGraphiQLFetcher: (options: any) => {
+    mockCreateFetcher(options)
+    return vi.fn()
+  },
+}))
+
+describe('<GraphiQLEditor />', () => {
+  const baseConfig: GraphiQLConfig = {
+    baseUrl: 'http://localhost:3457',
+    apiVersion: '2024-10',
+    apiVersions: ['2024-01', '2024-04', '2024-07', '2024-10', 'unstable'],
+    appName: 'Test App',
+    appUrl: 'http://localhost:3000',
+    storeFqdn: 'test-store.myshopify.com',
+  }
+
+  beforeEach(() => {
+    mockGraphiQL.mockClear()
+    mockCreateFetcher.mockClear()
+  })
+
+  test('renders GraphiQL component', () => {
+    render(<GraphiQLEditor config={baseConfig} apiVersion="2024-10" />)
+
+    expect(mockGraphiQL).toHaveBeenCalledTimes(1)
+  })
+
+  test('creates fetcher with correct URL including api_version', () => {
+    render(<GraphiQLEditor config={baseConfig} apiVersion="2024-07" />)
+
+    expect(mockCreateFetcher).toHaveBeenCalledWith(
+      expect.objectContaining({
+        url: 'http://localhost:3457/graphiql/graphql.json?api_version=2024-07',
+      }),
+    )
+  })
+
+  test('creates fetcher without Authorization header when key is not provided', () => {
+    render(<GraphiQLEditor config={baseConfig} apiVersion="2024-10" />)
+
+    expect(mockCreateFetcher).toHaveBeenCalledWith(
+      expect.objectContaining({
+        headers: {},
+      }),
+    )
+  })
+
+  test('creates fetcher with Authorization header when key is provided', () => {
+    const configWithKey = {...baseConfig, key: 'test-api-key'}
+    render(<GraphiQLEditor config={configWithKey} apiVersion="2024-10" />)
+
+    expect(mockCreateFetcher).toHaveBeenCalledWith(
+      expect.objectContaining({
+        headers: {
+          Authorization: 'Bearer test-api-key',
+        },
+      }),
+    )
+  })
+
+  test('passes ephemeral storage to GraphiQL', () => {
+    render(<GraphiQLEditor config={baseConfig} apiVersion="2024-10" />)
+
+    const graphiqlCall = mockGraphiQL.mock.calls[0][0]
+    expect(graphiqlCall.storage).toBeDefined()
+    expect(typeof graphiqlCall.storage.getItem).toBe('function')
+    expect(typeof graphiqlCall.storage.setItem).toBe('function')
+  })
+
+  test('ephemeral storage returns null for tabs key', () => {
+    render(<GraphiQLEditor config={baseConfig} apiVersion="2024-10" />)
+
+    const graphiqlCall = mockGraphiQL.mock.calls[0][0]
+    const storage = graphiqlCall.storage
+
+    expect(storage.getItem('tabs')).toBeNull()
+  })
+
+  test('ephemeral storage does not persist tabs on setItem', () => {
+    // Mock localStorage
+    const originalSetItem = Storage.prototype.setItem
+    const setItemSpy = vi.spyOn(Storage.prototype, 'setItem')
+
+    render(<GraphiQLEditor config={baseConfig} apiVersion="2024-10" />)
+
+    const graphiqlCall = mockGraphiQL.mock.calls[0][0]
+    const storage = graphiqlCall.storage
+
+    storage.setItem('tabs', '[]')
+    expect(setItemSpy).not.toHaveBeenCalledWith('tabs', expect.anything())
+
+    // Other keys should be persisted
+    storage.setItem('other-key', 'value')
+    expect(setItemSpy).toHaveBeenCalledWith('other-key', 'value')
+
+    setItemSpy.mockRestore()
+    Storage.prototype.setItem = originalSetItem
+  })
+
+  test('constructs defaultTabs with WELCOME_MESSAGE when no queries provided', () => {
+    render(<GraphiQLEditor config={baseConfig} apiVersion="2024-10" />)
+
+    const graphiqlCall = mockGraphiQL.mock.calls[0][0]
+    const defaultTabs = graphiqlCall.defaultTabs
+
+    // Should have WELCOME_MESSAGE + DEFAULT_SHOP_QUERY
+    expect(defaultTabs).toHaveLength(2)
+    expect(defaultTabs[0].query).toContain('Welcome to GraphiQL')
+    expect(defaultTabs[1].query).toContain('query shopInfo')
+  })
+
+  test('includes initial query from config as third tab', () => {
+    const configWithQuery = {
+      ...baseConfig,
+      query: 'query test { shop { name } }',
+      variables: '{"var": "value"}',
+    }
+    render(<GraphiQLEditor config={configWithQuery} apiVersion="2024-10" />)
+
+    const graphiqlCall = mockGraphiQL.mock.calls[0][0]
+    const defaultTabs = graphiqlCall.defaultTabs
+
+    // First tab is WELCOME_MESSAGE, second is DEFAULT_SHOP_QUERY, third is config query
+    expect(defaultTabs[2].query).toBe('query test { shop { name } }')
+    expect(defaultTabs[2].variables).toBe('{"var": "value"}')
+  })
+
+  test('always includes DEFAULT_SHOP_QUERY even if config has similar query', () => {
+    const configWithShopQuery = {
+      ...baseConfig,
+      query: 'query shopInfo { shop { id name } }',
+    }
+    render(<GraphiQLEditor config={configWithShopQuery} apiVersion="2024-10" />)
+
+    const graphiqlCall = mockGraphiQL.mock.calls[0][0]
+    const defaultTabs = graphiqlCall.defaultTabs
+
+    // Should have: WELCOME_MESSAGE + DEFAULT_SHOP_QUERY + config query (no deduplication)
+    expect(defaultTabs).toHaveLength(3)
+    expect(defaultTabs[0].query).toContain('Welcome to GraphiQL')
+    expect(defaultTabs[1].query).toContain('query shopInfo')
+    expect(defaultTabs[2].query).toContain('query shopInfo')
+  })
+
+  test('includes defaultQueries from config', () => {
+    const configWithDefaultQueries = {
+      ...baseConfig,
+      defaultQueries: [
+        {query: 'query products { products { edges { node { id } } } }'},
+        {query: 'query orders { orders { edges { node { id } } } }', variables: '{"first": 10}'},
+      ],
+    }
+    render(<GraphiQLEditor config={configWithDefaultQueries} apiVersion="2024-10" />)
+
+    const graphiqlCall = mockGraphiQL.mock.calls[0][0]
+    const defaultTabs = graphiqlCall.defaultTabs
+
+    // Should have: WELCOME_MESSAGE + DEFAULT_SHOP_QUERY + 2 defaultQueries
+    expect(defaultTabs).toHaveLength(4)
+    expect(defaultTabs[2].query).toContain('query products')
+    expect(defaultTabs[3].query).toContain('query orders')
+    expect(defaultTabs[3].variables).toBe('{"first": 10}')
+  })
+
+  test('adds preface to defaultQueries when provided', () => {
+    const configWithPreface = {
+      ...baseConfig,
+      defaultQueries: [
+        {
+          query: 'query test { shop { name } }',
+          preface: '# This is a test query',
+        },
+      ],
+    }
+    render(<GraphiQLEditor config={configWithPreface} apiVersion="2024-10" />)
+
+    const graphiqlCall = mockGraphiQL.mock.calls[0][0]
+    const defaultTabs = graphiqlCall.defaultTabs
+
+    expect(defaultTabs[2].query).toBe('# This is a test query\nquery test { shop { name } }')
+  })
+
+  test('WELCOME_MESSAGE is always the first tab', () => {
+    const configWithMultipleQueries = {
+      ...baseConfig,
+      query: 'query initial { shop { id } }',
+      defaultQueries: [
+        {query: 'query products { products { edges { node { id } } } }'},
+        {query: 'query orders { orders { edges { node { id } } } }'},
+      ],
+    }
+    render(<GraphiQLEditor config={configWithMultipleQueries} apiVersion="2024-10" />)
+
+    const graphiqlCall = mockGraphiQL.mock.calls[0][0]
+    const defaultTabs = graphiqlCall.defaultTabs
+
+    // First tab should always be WELCOME_MESSAGE
+    expect(defaultTabs[0].query).toContain('Welcome to GraphiQL')
+  })
+
+  test('passes correct props to GraphiQL', () => {
+    render(<GraphiQLEditor config={baseConfig} apiVersion="2024-10" />)
+
+    const graphiqlCall = mockGraphiQL.mock.calls[0][0]
+
+    expect(graphiqlCall.fetcher).toBeDefined()
+    expect(graphiqlCall.defaultEditorToolsVisibility).toBe(true)
+    expect(graphiqlCall.isHeadersEditorEnabled).toBe(false)
+    expect(graphiqlCall.forcedTheme).toBe('light')
+    expect(graphiqlCall.defaultTabs).toBeDefined()
+    expect(graphiqlCall.storage).toBeDefined()
+  })
+
+  test('updates fetcher when apiVersion changes', () => {
+    const {rerender} = render(<GraphiQLEditor config={baseConfig} apiVersion="2024-10" />)
+
+    expect(mockCreateFetcher).toHaveBeenCalledWith(
+      expect.objectContaining({
+        url: 'http://localhost:3457/graphiql/graphql.json?api_version=2024-10',
+      }),
+    )
+
+    // Clear mock and rerender with new version
+    mockCreateFetcher.mockClear()
+    rerender(<GraphiQLEditor config={baseConfig} apiVersion="2024-07" />)
+
+    // Note: Due to useMemo, the fetcher should recreate when apiVersion changes
+    expect(mockCreateFetcher).toHaveBeenCalledWith(
+      expect.objectContaining({
+        url: 'http://localhost:3457/graphiql/graphql.json?api_version=2024-07',
+      }),
+    )
+  })
+})

packages/graphiql-console/src/components/GraphiQLEditor/GraphiQLEditor.tsx

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+import React, {useMemo} from 'react'
+import {GraphiQL} from 'graphiql'
+import {createGraphiQLFetcher} from '@graphiql/toolkit'
+import 'graphiql/style.css'
+import type {GraphiQLConfig} from '@/types/config'
+import {WELCOME_MESSAGE, DEFAULT_SHOP_QUERY} from '@/constants/defaultContent.ts'
+
+interface GraphiQLEditorProps {
+  config: GraphiQLConfig
+  apiVersion: string
+}
+
+export function GraphiQLEditor({config, apiVersion}: GraphiQLEditorProps) {
+  // Create ephemeral storage to prevent localStorage tab caching
+  const ephemeralStorage: typeof localStorage = useMemo(() => {
+    return {
+      ...localStorage,
+      getItem(key) {
+        // Always use defaultTabs
+        if (key === 'tabs') return null
+        return localStorage.getItem(key)
+      },
+      setItem(key, value) {
+        // Don't persist tabs
+        if (key === 'tabs') return
+        localStorage.setItem(key, value)
+      },
+      removeItem(key) {
+        localStorage.removeItem(key)
+      },
+      clear() {
+        localStorage.clear()
+      },
+      key(index) {
+        return localStorage.key(index)
+      },
+      get length() {
+        return localStorage.length
+      },
+    }
+  }, [])
+
+  // Create fetcher with current API version
+  const fetcher = useMemo(() => {
+    const url = `${config.baseUrl}/graphiql/graphql.json?api_version=${apiVersion}`
+
+    return createGraphiQLFetcher({
+      url,
+      headers: config.key
+        ? {
+            Authorization: `Bearer ${config.key}`,
+          }
+        : {},
+    })
+  }, [config.baseUrl, config.key, apiVersion])
+
+  // Prepare default tabs
+  const defaultTabs = useMemo(() => {
+    const tabs = []
+
+    // 1. Add WELCOME_MESSAGE tab FIRST (in focus)
+    tabs.push({
+      query: WELCOME_MESSAGE,
+    })
+
+    // 2. Add DEFAULT_SHOP_QUERY tab SECOND (always)
+    tabs.push({
+      query: DEFAULT_SHOP_QUERY,
+      variables: '{}',
+    })
+
+    // 3. Add initial query from config (if provided)
+    if (config.query) {
+      tabs.push({
+        query: config.query,
+        variables: config.variables ?? '{}',
+      })
+    }
+
+    // 4. Add default queries from config
+    if (config.defaultQueries) {
+      config.defaultQueries.forEach(({query, variables, preface}) => {
+        tabs.push({
+          query: preface ? `${preface}\n${query}` : query,
+          variables: variables ?? '{}',
+        })
+      })
+    }
+
+    return tabs
+  }, [config.defaultQueries, config.query, config.variables])
+
+  return (
+    <GraphiQL
+      fetcher={fetcher}
+      defaultEditorToolsVisibility={true}
+      isHeadersEditorEnabled={false}
+      defaultTabs={defaultTabs}
+      forcedTheme="light"
+      storage={ephemeralStorage}
+    />
+  )
+}

packages/graphiql-console/src/components/GraphiQLEditor/index.ts

@@ -0,0 +1 @@
+export * from './GraphiQLEditor.tsx'