I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

Would you share the specific example of what is not working?

See usage examples in our tests at https://github.com/firebase/firebase-ios-sdk/blob/master/FirebaseRemoteConfigSwift/Tests/SwiftAPI/PropertyWrapperTests.swift

Hey @dpyy. We need more information to resolve this issue but there hasn't been an update in 5 weekdays. I'm marking the issue as stale and if there are no new updates in the next 5 days I will close it automatically.

If you have more information that will help us get to the bottom of this, just add a comment!

Would you share the specific example of what is not working?

See usage examples in our tests at https://github.com/firebase/firebase-ios-sdk/blob/master/FirebaseRemoteConfigSwift/Tests/SwiftAPI/PropertyWrapperTests.swift

Is there actual documentation on @RemoteConfigProperty? Because I can't see any. So I guess the question back to you is, how exactly does @RemoteConfigProperty work for a JSON server value? What type is passed back?

Hi @dpyy, unfortunately @RemoteConfigProperty is missing documentation (I'll add docs before closing this issue). In the meantime, to answer your question, the @RemoteConfigProperty property wrapper works on Decodable types, rather than an NSDictionary or NSArray that you're likely used to from the return type of jsonValue on RemoteConfigValue. I've added a couple examples below to get you started while I add documentation.

Top-Level Object

In this example the top-level entity in JSON is an object. This would have been returned as an NSDictionary when using the RemoteConfigValue.jsonValue approach.

{
  "recipeName": "Scrambled Eggs",
  "ingredients": [
    "eggs",
    "salt",
    "pepper",
    "butter"
  ],
  "cookMinutes": 5
}

Decodable

struct Recipe: Decodable {
  var recipeName: String
  var ingredients: [String]
  var cookMinutes: Int
}

Apple has some excellent documentation on creating Decodable (and Encodable / Codable) types to represent JSON in their Encoding and Decoding Custom Types guide. The Flight School Guide to Swift Codable is free right now and goes into even greater detail too.

Property-Wrapper

@RemoteConfigProperty(
  key: "recipe",
  fallback: Recipe(recipeName: "placeholder-recipe", ingredients: [], cookMinutes: 0)
) var recipe: Recipe

The fallback value is only used if Remote Config doesn't have a default value for the "recipe" key and it has not yet obtained the remotely configured value.

Top-Level Array

In this example the top-level entity in JSON is an array. This would have been returned as an NSArray when using the RemoteConfigValue.jsonValue approach.

[
  {
    "recipeName": "Scrambled Eggs",
    "ingredients": [
      "eggs",
      "salt",
      "pepper",
      "butter"
    ],
    "cookMinutes": 5
  },
  {
    "recipeName": "French Toast",
    "ingredients": [
      "eggs",
      "milk",
      "cinnamon",
      "bread",
      "butter",
      "maple syrup"
    ],
    "cookMinutes": 15
  }
]

Property-Wrapper

@RemoteConfigProperty(key: "recipe_list", fallback: []) var recipeList: [Recipe]

In this case the fallback value is just an empty array. Note that the wrapped value recipeList must be annotated with the type [Recipe] because Swift arrays only conform to Decodable if the contained type is known to be Decodable. An alternative approach would be to provide a fallback array containing a Recipe, e.g.:

@RemoteConfigProperty(
  key: "recipe_list",
  fallback: [Recipe(recipeName: "placeholder-recipe", ingredients: [], cookMinutes: 0)]
) var recipeList

Additional clarification

I expect @RemoteConfigProperty to parses JSON value into [String:[String]] but it doesn't

I just wanted to clarify whether this was a typo. Do you have example JSON payload that you'd expect to be parsed into [String:[String]]? As far as I'm aware, ["foo":["bar", "baz"]] wouldn't be valid JSON syntax but I could definitely be mis-guessing the expected input.

Yeah it conforms to decodable
@RemoteConfigProperty(key: "Json", fallback: structure(name: "Niket")) var value
I do have my default value where name is Yash, but still the property returns me the struct with name Niket which is basically a fallback when it fails to retrieve.
Why, please anyone?