Deep link URL patterns are correctly mapped to screens

A deep-link config that points to a screen name that does not exist, or a pattern parameter (:id) that the screen reads under a different key (route.params.productId), causes React Navigation to resolve the link to nothing, pass undefined to the screen, or render with a silently missing id. The user taps a product link and lands on a blank detail page; telemetry shows a navigation success but the screen queries undefined and renders an error state.

Align every pattern parameter with the exact key the screen reads from route.params. If the pattern is product/:id, the screen must read route.params.id:

const linking = {
  config: { screens: { ProductDetail: 'product/:id' } },
}

function ProductDetailScreen() {
  const { id } = useRoute().params as { id: string }
  // fetch product by id
}

Grep the codebase for each screen name to confirm exact casing and parameter keys match.

• ID: pattern-mapping

• Severity: critical

• What to look for: Examine the linking.config.screens object. Each URL pattern must map correctly to a screen's route name. Check for typos in screen names, incorrect parameter names (e.g., product/:id should match a screen using route.params.id), and pattern syntax issues.

• Pass criteria: Count all URL pattern-to-screen mappings. Every URL pattern in the config maps to a valid screen name that exists in your navigator with no more than 0 mismatches. Parameter names in patterns (e.g., :id) must match the parameter names used in screens (e.g., route.params.id).

• Fail criteria: Screen names in config do not match actual navigator screen names. Parameter names are inconsistent (pattern says :id but screen accesses route.params.productId). Do NOT pass when screen names match case-insensitively but differ in exact casing.

• Skip (N/A) when: Never — deep link patterns must map correctly.

• Detail on fail: Identify mapping mismatches. Example: "Config maps 'user/:id' to screen 'UserProfile' but actual screen name is 'Profile'" or "Pattern uses ':productId' but screen accesses 'route.params.id'"

• Remediation: Ensure exact consistency between pattern names and screen implementations. For a product detail screen:

  // linking config
  const linking = {
    config: {
      screens: {
        ProductDetail: 'product/:id'  // pattern parameter is :id
      }
    }
  }
  
  // ProductDetailScreen
  function ProductDetailScreen() {
    const route = useRoute()
    const productId = route.params.id  // must match pattern parameter name
    // ... render
  }