Added firebase functions method for use of function emulator.

Author: Reedyuk

firebase-functions/src/androidMain/kotlin/dev/gitlive/firebase/functions/functions.kt

@@ -28,6 +28,8 @@ actual fun Firebase.functions(app: FirebaseApp, region: String) =
 actual class FirebaseFunctions internal constructor(val android: com.google.firebase.functions.FirebaseFunctions) {
     actual fun httpsCallable(name: String, timeout: Long?) =
         HttpsCallableReference(android.getHttpsCallable(name).apply { timeout?.let { setTimeout(it, TimeUnit.MILLISECONDS) } })
+
+    actual fun useFunctionsEmulator(origin: String) = android.useFunctionsEmulator(origin)
 }
 
 actual class HttpsCallableReference internal constructor(val android: com.google.firebase.functions.HttpsCallableReference) {

firebase-functions/src/commonMain/kotlin/dev/gitlive/firebase/functions/functions.kt

@@ -13,6 +13,7 @@ import kotlinx.serialization.SerializationStrategy
 
 expect class FirebaseFunctions {
     fun httpsCallable(name: String, timeout: Long? = null): HttpsCallableReference
+    fun useFunctionsEmulator(origin: String)
 }
 
 expect class HttpsCallableReference {

firebase-functions/src/iosMain/kotlin/dev/gitlive/firebase/functions/functions.kt

@@ -30,6 +30,8 @@ actual fun Firebase.functions(app: FirebaseApp, region: String) =
 actual class FirebaseFunctions internal constructor(val ios: FIRFunctions) {
     actual fun httpsCallable(name: String, timeout: Long?) =
         HttpsCallableReference(ios.HTTPSCallableWithName(name).apply { timeout?.let { setTimeoutInterval(it/1000.0) } })
+
+    actual fun useFunctionsEmulator(origin: String) = ios.useFunctionsEmulatorOrigin(origin)
 }
 
 actual class HttpsCallableReference internal constructor(val ios: FIRHTTPSCallable) {

firebase-functions/src/jsMain/kotlin/dev/gitlive/firebase/functions/functions.kt

@@ -25,6 +25,8 @@ actual fun Firebase.functions(app: FirebaseApp, region: String) =
 actual class FirebaseFunctions internal constructor(val js: firebase.functions.Functions) {
     actual fun httpsCallable(name: String, timeout: Long?) =
         rethrow { HttpsCallableReference(js.httpsCallable(name, timeout?.let { json("timeout" to timeout.toDouble()) })) }
+
+    actual fun useFunctionsEmulator(origin: String): Unit = throw NotImplementedError()
 }
 
 @Suppress("UNCHECKED_CAST")