WriteFile

    pub const WriteFile = struct {
        flags: @This().Flags,
        generated_directory: GeneratedFileIndex,
        embeds: Storage.FlagLengthPrefixedList(.flags, .embeds, Embed),
        copies: Storage.FlagLengthPrefixedList(.flags, .copies, Copy),
        directories: Storage.FlagLengthPrefixedList(.flags, .directories, Directory),
        mutate_path: Storage.EnumOptional(.flags, .mode, .mutate, LazyPath.Index),

        pub const Embed = extern struct {
            sub_path: String,
            contents: Bytes,
        };

        pub const Copy = extern struct {
            sub_path: String,
            src_file: LazyPath.Index,
        };

        pub const Directory = extern struct {
            sub_path: String,
            src_path: LazyPath.Index,
            exclude_extensions: OptionalStringList,
            include_extensions: OptionalStringList,
        };

        pub const Mode = enum(u2) {
            whole_cached,
            tmp,
            mutate,
        };

        pub const Flags = packed struct(u32) {
            tag: Tag = .write_file,
            embeds: bool,
            copies: bool,
            directories: bool,
            mode: Mode,
            _: u22 = 0,
        };
    }