Search code examples
dataweaveanypoint-studiomule4

What is the equivalent DataWeave type for Typescript's Record<string, any>?

DataWeave has a type declaration system similar to Typescript.

I want to define a DataWeave type that is equivalent to Typescript's Record<string, V>.

Specifically, I want to define a map-like type wherein I do not know the specific keys but I do know that they are Strings, and I do know what the values will be.

For example:

{
  "foo": { "answer": 42 },
  "bar": { "answer": 1337 },
  "this key could be any string": { "answer": 1 }
}

What I've tried

Per DataWeave's v2.3 documentation, I can declare an object type as:

type User = {
    firstName: String,
    lastName: String,
    age: Number
}

However, that assumes I know what the keys in that object are, namely firstName, lastName, and age. In my use case, I do not know what the keys are, only that they are strings.

Thanks

Solution

  • After reviewing the autogenerated types in my Mule4 project at src/main/resources/weave/autogenerated, I discovered that unknown key properties are represented by _ (underscore).

    Example:

    type Foo = {
    _: {
        name: String
    }
}

var myfoo: Foo = {
    "a": {
        name: "aa"
    },
    "b": {
        name: "bb"
    }
}

    DataWeave will now autosuggest name property when you write myfoo['any string here'].

    dataweave autocomplete