feat: add @aris/source-weatherkit package

Implements FeedSource for WeatherKit API. Depends on location source, provides weather context for downstream sources, and produces weather feed items. Co-authored-by: Ona <no-reply@ona.com>
2026-02-02 05:01:17 +00:00 · 2026-01-19 00:43:38 +00:00
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+# @aris/source-weatherkit
+
+Weather feed source using Apple WeatherKit API.
+
+## Usage
+
+### Basic Setup
+
+```ts
+import { WeatherSource, Units } from "@aris/source-weatherkit"
+
+const weatherSource = new WeatherSource({
+	credentials: {
+		privateKey: process.env.WEATHERKIT_PRIVATE_KEY!,
+		keyId: process.env.WEATHERKIT_KEY_ID!,
+		teamId: process.env.WEATHERKIT_TEAM_ID!,
+		serviceId: process.env.WEATHERKIT_SERVICE_ID!,
+	},
+	units: Units.metric,
+})
+```
+
+### With Feed Source Graph
+
+```ts
+import { LocationSource } from "@aris/source-location"
+import { WeatherSource } from "@aris/source-weatherkit"
+
+const locationSource = new LocationSource()
+const weatherSource = new WeatherSource({ credentials })
+
+// Weather depends on location - graph handles ordering
+const sources = [locationSource, weatherSource]
+```
+
+### Reading Weather Context
+
+Downstream sources can access weather data:
+
+```ts
+import { contextValue } from "@aris/core"
+import { WeatherKey } from "@aris/source-weatherkit"
+
+async function fetchContext(context: Context) {
+	const weather = contextValue(context, WeatherKey)
+
+	if (weather?.condition === "Rain") {
+		// Suggest umbrella, indoor activities, etc.
+	}
+
+	if (weather && weather.uvIndex > 7) {
+		// Suggest sunscreen
+	}
+}
+```
+
+## Exports
+
+| Export          | Description                             |
+| --------------- | --------------------------------------- |
+| `WeatherSource` | FeedSource implementation               |
+| `WeatherKey`    | Context key for simplified weather data |
+| `Weather`       | Type for weather context                |
+| `Units`         | `metric` or `imperial`                  |
+
+## Options
+
+| Option        | Default  | Description                |
+| ------------- | -------- | -------------------------- |
+| `credentials` | -        | WeatherKit API credentials |
+| `client`      | -        | Custom WeatherKit client   |
+| `hourlyLimit` | `12`     | Max hourly forecasts       |
+| `dailyLimit`  | `7`      | Max daily forecasts        |
+| `units`       | `metric` | Temperature/speed units    |
+
+## Context
+
+Provides simplified weather context for downstream sources:
+
+```ts
+interface Weather {
+	temperature: number
+	temperatureApparent: number
+	condition: ConditionCode
+	humidity: number
+	uvIndex: number
+	windSpeed: number
+	daylight: boolean
+}
+```
+
+## Feed Items
+
+Produces feed items:
+
+- `weather-current` - Current conditions
+- `weather-hourly` - Hourly forecasts (up to `hourlyLimit`)
+- `weather-daily` - Daily forecasts (up to `dailyLimit`)
+- `weather-alert` - Weather alerts when present
+
+Priority is adjusted based on weather severity (storms, extreme temperatures).