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ios - Type 'Any' has no subscript members (firebase)

I am getting this error: "Type 'Any' has no subscript members" when trying to run this block of code:

init(snapshot: FIRDataSnapshot) {
    key = snapshot.key
    itemRef = snapshot.ref

    if let postContent = snapshot.value!["content"] as? String {   // error
        content = postContent
    } else {
        content = ""
    }
}

I have been searching for an answer and couldn't find one that solved this problem with FireBase. How would I solve this error?

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