Unity-Lua files (files with .lua extension) cannot be recognized by Unity

Official manual: ScriptedImporter official manual description

Solution:

Put the following files into the Editor folder and wait for Unity to automatically refresh or reopen Unity to recognize them.

using System.IO;
using UnityEditor.Experimental.AssetImporters;
using UnityEngine;

[ScriptedImporter(1, ".lua")]
public class LuaImporter : ScriptedImporter
{
    public override void OnImportAsset(AssetImportContext ctx)
    {
        //读取文件内容
        var luaTxt = File.ReadAllText(ctx.assetPath);        
        //转成TextAsset（Unity可识别类型）
        var assetsText = new TextAsset(luaTxt);
        //将对象assetText添加到导入操作(AssetImportContext)的结果中。
        ctx.AddObjectToAsset("main obj", assetsText);
        //将对象assetText作为导入操作的主要对象。
        ctx.SetMainObject(assetsText);
    }
}

In this way, it can be correctly recognized as the same thing as TextAsset file. You can write t:TextAsset in the search bar of the Project window to search for all .lua files, and the AB package can be packaged normally.