feat: Add 'IsValidField'

[UE4SS]

Description

Adds 'IsValidField' to RemoteObject, including UObject.
It returns true if the field (i.e. property or function) exists in the UObject regardless if IsValid would return false because of a nullptr.

See test section for example of usage.

Fixes #1284

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

How has this been tested?

Run this code when GameModeBase exists.
For me in Palworld, that's at the main menu.

RegisterKeyBind(Key.K, {ModifierKey.CONTROL}, function()
    local GameMode = FindFirstOf("GameModeBase")
    if GameMode:IsValid() then
        print(string.format("GameMode: %s\n", GameMode:GetFullName()))
    else
        print("GameMode not valid\n")
        return
    end

    if GameMode.aaa:IsValidField() then
        print("aaa:IsValidField(): YES\n")
    else
        print("aaa:IsValidField(): NO\n")
    end
    if GameMode.aaa:IsValid() then
        print("aaa:IsValid(): YES\n")
    else
        print("aaa:IsValid(): NO\n")
    end

    if GameMode.GameState:IsValidField() then
        print("GameState:IsValidField(): YES\n")
    else
        print("GameState:IsValidField(): NO\n")
    end
    if GameMode.GameState:IsValid() then
        print("GameState:IsValid(): YES\n")
    else
        print("GameState:IsValid(): NO\n")
    end
    GameMode.GameState = nil
    if GameMode.GameState:IsValidField() then
        print("GameState:IsValidField(): YES\n")
    else
        print("GameState:IsValidField(): NO\n")
    end
    if GameMode.GameState:IsValid() then
        print("GameState:IsValid(): YES\n")
    else
        print("GameState:IsValid(): NO\n")
    end
end)

Expected outcome:

aaa:IsReflected(): NO
aaa:IsValid(): NO
GameState:IsReflected(): YES
GameState:IsValid(): YES
GameState:IsReflected(): YES
GameState:IsValid(): NO

You can create a universal function that can handle LocalObject as well, if you want that for some reason:

local function IsValidField(Object, Field)
    if type(Field) ~= "string" then return false end
    if Object[Field].IsValidField then
        return Object[Field]:IsValidField()
    else
        return Object[Field]
    end
end

[github-actions]

Build Details

Name	Information
PR Commit	f6ec6a7
Merge Commit	e0e8bd9
Size	41.74 MB
Last Updated	Jul 2, 26, 9:26:34 PM UTC
Expires At	Jul 16, 26, 9:26:30 PM UTC

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Build Details

Name	Information
PR Commit	f6ec6a7
Merge Commit	e0e8bd9
Size	41.75 MB
Last Updated	Jul 2, 26, 9:21:09 PM UTC
Expires At	Jul 16, 26, 9:21:05 PM UTC