fix(weather): Improve error handling and update API key check

examples/get-weather-js/package.json

@@ -5,7 +5,7 @@
         "@bytecodealliance/jco": "^1.11.1"
     },
     "scripts": {
-        "build:component": "jco componentize -w ./wit weather.js -d stdio -d random -d clocks -o weather.wasm",
+        "build:component": "jco componentize -w ./wit weather.js -o weather.wasm",
         "transpile": "jco transpile weather.wasm -o out-dir",
         "debug": "node use-weather.js"
     },

examples/get-weather-js/weather.js

@@ -1,31 +1,32 @@
 import { get } from "wasi:config/[email protected]";
 
 export async function getWeather(city) {
+  const apiKey = await get("OPENWEATHER_API_KEY");
+  if (apiKey === undefined) {
+    throw "Error: OPENWEATHER_API_KEY is not set";
+  }
+
   try {
-    const apiKey = await get("OPENWEATHER_API_KEY");
-    if (apiKey === undefined) {
-      return "Error: OPENWEATHER_API_KEY is not set";
-    }
     const geoResponse = await fetch(
       `https://api.openweathermap.org/geo/1.0/direct?q=${city}&limit=1&appid=${apiKey}`
     );
     if (!geoResponse.ok) {
-      return "Error: Failed to fetch geo data";
+      throw "Error: Failed to fetch geo data";
     }
     const geoData = await geoResponse.json();
     const lat = geoData[0].lat;
     const lon = geoData[0].lon;
-
     const response = await fetch(
       `https://api.openweathermap.org/data/2.5/weather?lat=${lat}&lon=${lon}&appid=${apiKey}&units=metric`
-    )
+    );
     if (!response.ok) {
-      return "Error: Failed to fetch weather data";
+      throw "Error: Failed to fetch weather data";
     }
     const data = await response.json();
     const weather = data.main.temp.toString();
-    return weather;
+    return weather;  
   } catch (error) {
-    return "Error fetching weather data";
+    throw error.message || "Error fetching weather data";
   }
+
 }

examples/get-weather-js/wit/mcp.wit

@@ -2,5 +2,5 @@ package mossaka:[email protected];
 
 world weather-mcp {
     import wasi:config/[email protected];
-    export get-weather: func(city: string) -> string;
+    export get-weather: func(city: string) -> result<string, string>;
 }