one/src/platform/light-sensor/types.ts

One is a React framework for web, iOS, and Android apps.

// ambient light through the platform light sensor, matching
// expo-sensors' parameters, payload fields and values. the function names
// drop expo's Async suffix and the words that repeat the namespace.
export interface LightSensorMeasurement {
  // ambient light in lux (lx).
  illuminance: number
  // seconds since boot, matching expo on android; unix seconds on web.
  timestamp: number
}

export interface LightSensorSubscription {
  remove(): void
}