概要

using UnityEditor;
using UnityEditor.Compilation;
using UnityEngine;

[InitializeOnLoad]
public static class Example
{
    static Example()
    {
        CompilationPipeline.assemblyCompilationFinished += ( name, messages ) =>
        {
            Debug.Log( name );
        };
    }
}

CompilationPipeline.assemblyCompilationFinished が呼び出されます