Cypress Selectors

When to Use This Skill

• Adding data-cy attributes to components
• Creating new BLOCK_SELECTORS for a block
• Working with Page Object Models (POMs)
• Validating selector coverage in UI
• Writing Cypress E2E tests

Key Functions

sel(path: string, replacements?: object)

Use in components to get the selector string for data-cy:

// In block component: contents/themes/{theme}/blocks/{block-name}/component.tsx
import { sel } from '../../lib/selectors'

// Static selector - note the 'blocks.' prefix for block selectors
<section data-cy={sel('blocks.hero.container')}>
  <h2 data-cy={sel('blocks.hero.title')}>{title}</h2>
</section>

// Dynamic selector with replacement
{items.map((item, index) => (
  <div data-cy={sel('blocks.faqAccordion.item', { index: String(index) })}>
    {item.content}
  </div>
))}

// Core selectors (no 'blocks.' prefix)
<button data-cy={sel('auth.login.submit')}>Login</button>

cySelector(path: string, replacements?: object)

Use in POMs and Cypress tests to get the CSS selector [data-cy="..."]:

// In POM: contents/themes/{theme}/tests/cypress/src/features/MyPOM.ts
import { BasePOM } from '../core/BasePOM'
import { cySelector } from '../selectors'

export class HeroPOM extends BasePOM {
  get selectors() {
    return {
      container: cySelector('blocks.hero.container'),
      title: cySelector('blocks.hero.title'),
    }
  }

  // Dynamic selectors
  getItem(index: number) {
    return cy.get(cySelector('blocks.faqAccordion.item', { index: String(index) }))
  }

  // Factory method
  static create(): HeroPOM {
    return new HeroPOM()
  }
}

// In test file: contents/themes/{theme}/tests/cypress/e2e/blocks/hero.cy.ts
import { cySelector } from '../../src/selectors'

describe('Hero Block', () => {
  it('should display the hero', () => {
    cy.get(cySelector('blocks.hero.container')).should('be.visible')
  })
})

entitySelectors(slug: string)

Get all selectors for a specific entity:

import { entitySelectors } from '../../src/selectors'

const taskSelectors = entitySelectors('tasks')
// Returns: { table, row, createBtn, editBtn, ... }

Selector Paths

IMPORTANT: Block selectors use the blocks. prefix because BLOCK_SELECTORS is nested under blocks: in THEME_SELECTORS:

// Block selectors - use 'blocks.' prefix
sel('blocks.hero.container')           // → 'block-hero'
sel('blocks.faqAccordion.item', { index: '0' })  // → 'faq-item-0'
sel('blocks.pricingTable.plan', { index: '1' }) // → 'pricing-plan-1'

// Core selectors - no prefix
sel('auth.login.form')                 // → 'login-form'
sel('entity.table', { slug: 'tasks' }) // → 'tasks-table'

// Devtools selectors - use 'devtools.' prefix
sel('devtools.scheduledActions.table') // → 'scheduled-actions-table'

Naming Conventions

Static Selectors

domain-element

Examples:

• block-hero (block container)
• login-form (core component)
• nav-main (navigation element)

Dynamic Selectors with Placeholders

{placeholder}-element-{placeholder}

Placeholders:

• {index} - Array index (most common for blocks)
• {slug} - Entity slug (tasks, customers, pages)
• {id} - Record ID
• {name} - Field name
• {action} - Action name (edit, delete)

Examples:

• faq-item-{index} → faq-item-0
• {slug}-row-{id} → tasks-row-123
• field-{name} → field-email

File Locations

Adding New Selectors

For Block Components

Edit contents/themes/{theme}/lib/selectors.ts, add to BLOCK_SELECTORS:

export const BLOCK_SELECTORS = {
  // ... existing blocks
  myNewBlock: {
    container: 'block-my-new-block',
    title: 'my-block-title',
    item: 'my-block-item-{index}',
  }
}

Then use in component with blocks. prefix:

// contents/themes/{theme}/blocks/my-new-block/component.tsx
import { sel } from '../../lib/selectors'

<section data-cy={sel('blocks.myNewBlock.container')}>
  <h2 data-cy={sel('blocks.myNewBlock.title')}>{title}</h2>
</section>

For Core Components

Edit core/lib/test/core-selectors.ts:

export const CORE_SELECTORS = {
  // ... existing selectors
  myNewFeature: {
    container: 'my-feature-container',
    list: 'my-feature-list',
    item: 'my-feature-item-{id}',
  }
}

For DevTools Components

Edit contents/themes/{theme}/lib/selectors.ts, add to DEVTOOLS_SELECTORS:

export const DEVTOOLS_SELECTORS = {
  // ... existing selectors
  myDevTool: {
    page: 'devtools-my-tool-page',
    table: 'my-tool-table',
  }
}

Anti-Patterns

// ❌ NEVER: Hardcoded data-cy in component
<button data-cy="submit-btn">

// ❌ NEVER: Direct selector string in test
cy.get('[data-cy="submit-btn"]')

// ❌ NEVER: Missing 'blocks.' prefix for block selectors
sel('hero.container')  // Wrong!
sel('blocks.hero.container')  // Correct!

// ❌ NEVER: Import from core in theme components
import { sel } from '@/core/lib/test'  // Wrong!
import { sel } from '../../lib/selectors'  // Correct!

// ❌ NEVER: Add selector without UI element
// Only add selectors for existing UI elements

Validation Scripts

Validate all selectors use sel()

python .claude/skills/cypress-selectors/scripts/validate-selectors.py

Find elements missing data-cy

python .claude/skills/cypress-selectors/scripts/extract-missing.py --path contents/themes/default/blocks/

Generate block selectors for new block

# Basic generation
python .claude/skills/cypress-selectors/scripts/generate-block-selectors.py --block my-new-block

# Analyze existing block and generate full example
python .claude/skills/cypress-selectors/scripts/generate-block-selectors.py --block faq-accordion --analyze --full

# Just show selector entry without instructions
python .claude/skills/cypress-selectors/scripts/generate-block-selectors.py --block my-block --dry-run

Checklist

Before committing UI changes:

• All interactive elements have data-cy={sel('...')}
• Block selectors use sel('blocks.{blockName}.{element}') path
• New selectors added to BLOCK_SELECTORS or CORE_SELECTORS
• POM updated with new selectors using cySelector()
• Selector validation test created in _selectors/*.cy.ts
• No hardcoded data-cy strings in components
• No direct core imports in theme files

References

• Load references/architecture.md for detailed architecture
• Load references/naming-conventions.md for naming rules
• Load references/anti-patterns.md for common mistakes