Hi, what should be the type of an optional propert...

# javascript

[Ayfri]

Hi, what should be the type of an optional property of an external interface ?

[andylamax]

Give it a default value

external fun optionFunction(optionalArg: String = definedExternally)

[Ayfri]

Not an argument, a property,

interface CompressedTextureExtensions {
    s3tc: WEBGL_compressed_texture_s3tc?
}

[turansky]

external interface CompressedTextureExtensions {
    var s3tc: WEBGL_compressed_texture_s3tc?
}

[Ayfri]

Just nullable type ? I've seen in dukat generations that they set definedExternally getters/setters for optional properties 🤔

[turansky]

You can add it if you need more code with same result 🙂

[turansky]

Single (legal) case for definedExternally , where it’s really required - function parameters

[Ayfri]

Ah okay I see, and if a property in TS has the type String | null it's also String? in Kotlin I guess ?

[andylamax]

Yes a String | null is String? in kotlin

[Big Chungus]

Nullable types with default getter and setter implementations via definedExternally

[Big Chungus]

Benefit of doing it this way is that you are bot forced to override them when implementing said interface