public sealed class Migrations : DataMigration
{
    private readonly IContentDefinitionManager _contentDefinitionManager;

    public Migrations(IContentDefinitionManager contentDefinitionManager)
    {
        _contentDefinitionManager = contentDefinitionManager;
    }

    public async Task<int> CreateAsync()
    {
        await _contentDefinitionManager.AlterTypeDefinitionAsync("{{ContentTypeName}}", type => type
            .DisplayedAs("{{DisplayName}}")
            .Creatable()
            .Listable()
            .Draftable()
            .Versionable()
            .WithPart("TitlePart", part => part
                .WithPosition("0")
            )
            .WithPart("AutoroutePart", part => part
                .WithPosition("1")
                .WithSettings(new AutoroutePartSettings
                {
                    AllowCustomPath = true,
                    Pattern = "{{ ContentItem | display_text | slugify }}"
                })
            )
        );

        return 1;
    }
}

await _contentDefinitionManager.AlterPartDefinitionAsync("{{PartName}}", part => part
    .WithField("{{FieldName}}", field => field
        .OfType("{{FieldType}}")
        .WithDisplayName("{{FieldDisplayName}}")
        .WithPosition("{{Position}}")
    )
);