How to hide a sprite when they are in shadow using Unity 2D Light System?

@Mirmukhsin yea I was able to find a solution to it and I posted it here if you want to skip reading everything. The solution basically edits the Sprite-Lit-Default script so that it takes into account the luminosity of the object, basically how much light is hitting the sprite. With that it will calculate the amount of light hitting the sprite and apply either a transparent texture or a lit texture. So if you look at the image above, it will the dark area would become transparent and the lit area (with the gradient fallout) will stay the same.

Same feature as in the game Among Us (I was trying to make a clone at the time). However I wasn't the one who came up with this solution, someone from the Unity discord server helped me out. I also posted this solution on stackoverflow here.

Now there are some flaws (maybe not for your case). One, since it does some calculation using the Light system, if there is no light in the scene (and I mean anywhere in the scene it can even be on the other side of the map, it will still use that light to calculate the luminosity of the object, basically you must be using lights for this to work) the texture will appear completely visible, unlike when you apply the Sprite-Lit-Default to it and it becomes dark. Two, you have to use good amount of lighting, light intensity, meaning if you make it too intense the light will "bleed" into the shadow area making it slightly lit, now again you can use this as a feature or it might be the deal breaker for you, but this is what I got.

First the person who helped me with this created a .hlsl file, now this is the same file used for the CombinedShapeLightShared.hlsl can be found here, but with added functionality to calculate luminosity, Unity uses this to calculate lighting. He named it CombinedShapeLightSharedHidden.hlsl, now this is important that the name stays the same or else you have to change the name to the file and everywhere else you see this name. It seems when I try to type code here for .hlsl it messes up the markdown because of the #s. So you can go to the stackoverflow post I posted and get it from there

The second file he created was HideInShadow.shader, and this is the same thing as the Sprite-Lit-Default.shader that you would use for the light system but with added functionality, it will basically call the function from the previous file that calculates the luminosity of the texture and apply it to the texture. Again, its being weird with me with writing code, you can find the code in stackoverflow same post.

Then you create a material to apply the HideInShadow.shader to and then apply that material to the objects you want to be invisible in the shadows.

Now keep in mind these 2 things. One, don't change the names unless you change them everywhere else. And two, both files that were create must be in the same folder. Unless you know what you are doing. FEEL FREE TO POST ANOTHER SOLUTION IF YOU FOUND ANY