booking-microservices/building-blocks/Mapster/Extensions.cs

using System.Reflection;
using Mapster;
using MapsterMapper;
using Microsoft.Extensions.DependencyInjection;

namespace BuildingBlocks.Mapster;

public static class Extensions
{
    public static IServiceCollection AddCustomMapster(this IServiceCollection services, params Assembly[] assemblies)
    {
        var typeAdapterConfig = TypeAdapterConfig.GlobalSettings;
        typeAdapterConfig.Scan(assemblies);
        var mapperConfig = new Mapper(typeAdapterConfig);
        services.AddSingleton<IMapper>(mapperConfig);

        return services;
    }
}