diff --git a/crates/dagger-codegen/src/predicates.rs b/crates/dagger-codegen/src/predicates.rs
index 9ee9016..d807bcc 100644
--- a/crates/dagger-codegen/src/predicates.rs
+++ b/crates/dagger-codegen/src/predicates.rs
@@ -40,9 +40,9 @@ pub fn is_required_type(t: &FullTypeInputFields) -> bool {
 
 pub fn is_required_type_ref(t: &TypeRef) -> bool {
     match t.kind {
-        Some(__TypeKind::NON_NULL) => return false,
-        Some(_) => return true,
-        _ => return false,
+        Some(__TypeKind::NON_NULL) => return true,
+        Some(_) => return false,
+        _ => return true,
     }
 }
 
diff --git a/crates/dagger-sdk/src/gen.rs b/crates/dagger-sdk/src/gen.rs
index 47aa9eb..5b885d9 100644
--- a/crates/dagger-sdk/src/gen.rs
+++ b/crates/dagger-sdk/src/gen.rs
@@ -2,9 +2,6 @@ use dagger_core::{Boolean, Input, Int, Scalar};
 
 // code generated by dagger. DO NOT EDIT.
 
-/// A file identifier.
-pub struct FileID(Scalar);
-
 /// A content-addressed directory identifier.
 pub struct DirectoryID(Scalar);
 
@@ -15,8 +12,8 @@ pub struct CacheID(Scalar);
 /// The format is [os]/[platform]/[version] (e.g. darwin/arm64/v7, windows/amd64, linux/arm64).
 pub struct Platform(Scalar);
 
-/// A unique identifier for a secret.
-pub struct SecretID(Scalar);
+/// A file identifier.
+pub struct FileID(Scalar);
 
 /// A content-addressed socket identifier.
 pub struct SocketID(Scalar);
@@ -24,120 +21,34 @@ pub struct SocketID(Scalar);
 /// A unique container identifier. Null designates an empty container (scratch).
 pub struct ContainerID(Scalar);
 
+/// A unique identifier for a secret.
+pub struct SecretID(Scalar);
+
 ///
 pub struct BuildArg {
-    pub name: Option<String>,
+    pub value: String,
 
-    pub value: Option<String>,
+    pub name: String,
 }
 
 impl Input for BuildArg {}
 
-/// A file.
-pub struct File {}
+/// A reference to a secret value, which can be handled more safely than the value itself.
+pub struct Secret {}
 
-impl File {
-    /// Retrieves the contents of the file.
-    pub fn contents(&self) -> Option<String> {
+impl Secret {
+    /// The identifier for this secret.
+    pub fn id(&self) -> SecretID {
         todo!()
     }
 
-    /// Writes the file to a file path on the host.
-    pub fn export(&self, path: Option<String>) -> Option<Boolean> {
-        todo!()
-    }
-
-    /// Retrieves the content-addressed identifier of the file.
-    pub fn id(&self) -> Option<FileID> {
-        todo!()
-    }
-
-    /// Retrieves a secret referencing the contents of this file.
-    pub fn secret(&self) -> Option<Secret> {
-        todo!()
-    }
-
-    /// Gets the size of the file, in bytes.
-    pub fn size(&self) -> Option<Int> {
-        todo!()
-    }
-
-    /// Retrieves this file with its created/modified timestamps set to the given time, in seconds from the Unix epoch.
-    pub fn with_timestamps(&self, timestamp: Option<Int>) -> Option<File> {
+    /// The value of this secret.
+    pub fn plaintext(&self) -> String {
         todo!()
     }
 }
 
-impl Input for File {}
-
-/// A set of scripts and/or extensions
-pub struct Project {}
-
-impl Project {
-    /// extensions in this project
-    pub fn extensions(&self) -> Vec<Option<Project>> {
-        todo!()
-    }
-
-    /// Code files generated by the SDKs in the project
-    pub fn generated_code(&self) -> Option<Directory> {
-        todo!()
-    }
-
-    /// install the project's schema
-    pub fn install(&self) -> Option<Boolean> {
-        todo!()
-    }
-
-    /// name of the project
-    pub fn name(&self) -> Option<String> {
-        todo!()
-    }
-
-    /// schema provided by the project
-    pub fn schema(&self) -> String {
-        todo!()
-    }
-
-    /// sdk used to generate code for and/or execute this project
-    pub fn sdk(&self) -> String {
-        todo!()
-    }
-}
-
-impl Input for Project {}
-
-/// A git repository.
-pub struct GitRepository {}
-
-impl GitRepository {
-    /// Returns details on one branch.
-    pub fn branch(&self, name: Option<String>) -> Option<GitRef> {
-        todo!()
-    }
-
-    /// Lists of branches on the repository.
-    pub fn branches(&self) -> Option<Vec<Option<String>>> {
-        todo!()
-    }
-
-    /// Returns details on one commit.
-    pub fn commit(&self, id: Option<String>) -> Option<GitRef> {
-        todo!()
-    }
-
-    /// Returns details on one tag.
-    pub fn tag(&self, name: Option<String>) -> Option<GitRef> {
-        todo!()
-    }
-
-    /// Lists of tags on the repository.
-    pub fn tags(&self) -> Option<Vec<Option<String>>> {
-        todo!()
-    }
-}
-
-impl Input for GitRepository {}
+impl Input for Secret {}
 
 /// Information about the host execution environment.
 pub struct Host {}
@@ -146,69 +57,244 @@ impl Host {
     /// Accesses a directory on the host.
     pub fn directory(
         &self,
-        path: Option<String>,
-        exclude: Vec<Option<String>>,
-        include: Vec<Option<String>>,
-    ) -> Option<Directory> {
+        path: String,
+        exclude: Option<String>,
+        include: Option<String>,
+    ) -> Directory {
         todo!()
     }
 
     /// Accesses an environment variable on the host.
-    pub fn env_variable(&self, name: Option<String>) -> HostVariable {
+    pub fn env_variable(&self, name: String) -> HostVariable {
         todo!()
     }
 
     /// Accesses a Unix socket on the host.
-    pub fn unix_socket(&self, path: Option<String>) -> Option<Socket> {
+    pub fn unix_socket(&self, path: String) -> Socket {
         todo!()
     }
 
     /// Retrieves the current working directory on the host.
-    pub fn workdir(
-        &self,
-        exclude: Vec<Option<String>>,
-        include: Vec<Option<String>>,
-    ) -> Option<Directory> {
+    pub fn workdir(&self, exclude: Option<String>, include: Option<String>) -> Directory {
         todo!()
     }
 }
 
 impl Input for Host {}
 
+/// A git repository.
+pub struct GitRepository {}
+
+impl GitRepository {
+    /// Returns details on one branch.
+    pub fn branch(&self, name: String) -> GitRef {
+        todo!()
+    }
+
+    /// Lists of branches on the repository.
+    pub fn branches(&self) -> Option<String> {
+        todo!()
+    }
+
+    /// Returns details on one commit.
+    pub fn commit(&self, id: String) -> GitRef {
+        todo!()
+    }
+
+    /// Returns details on one tag.
+    pub fn tag(&self, name: String) -> GitRef {
+        todo!()
+    }
+
+    /// Lists of tags on the repository.
+    pub fn tags(&self) -> Option<String> {
+        todo!()
+    }
+}
+
+impl Input for GitRepository {}
+
+/// A git ref (tag, branch or commit).
+pub struct GitRef {}
+
+impl GitRef {
+    /// The digest of the current value of this ref.
+    pub fn digest(&self) -> String {
+        todo!()
+    }
+
+    /// The filesystem tree at this ref.
+    pub fn tree(&self, ssh_known_hosts: String, ssh_auth_socket: SocketID) -> Directory {
+        todo!()
+    }
+}
+
+impl Input for GitRef {}
+
+/// An environment variable on the host environment.
+pub struct HostVariable {}
+
+impl HostVariable {
+    /// A secret referencing the value of this variable.
+    pub fn secret(&self) -> Secret {
+        todo!()
+    }
+
+    /// The value of this variable.
+    pub fn value(&self) -> String {
+        todo!()
+    }
+}
+
+impl Input for HostVariable {}
+
+/// A directory whose contents persist across runs.
+pub struct CacheVolume {}
+
+impl CacheVolume {
+    ///
+    pub fn id(&self) -> CacheID {
+        todo!()
+    }
+}
+
+impl Input for CacheVolume {}
+
+/// A directory.
+pub struct Directory {}
+
+impl Directory {
+    /// Gets the difference between this directory and an another directory.
+    pub fn diff(&self, other: DirectoryID) -> Directory {
+        todo!()
+    }
+
+    /// Retrieves a directory at the given path.
+    pub fn directory(&self, path: String) -> Directory {
+        todo!()
+    }
+
+    /// Builds a new Docker container from this directory.
+    /// # Arguments
+    ///
+    /// * `dockerfile` - Path to the Dockerfile to use.
+    ///   Path to the Dockerfile to use.
+    ///   Defaults to './Dockerfile'.
+    /// * `platform` - The platform to build.
+    ///   The platform to build.
+    /// * `buildArgs` - Additional build arguments.
+    ///   Additional build arguments.
+    /// * `target` - Target build stage to build.
+    ///   Target build stage to build.
+    pub fn docker_build(
+        &self,
+        dockerfile: String,
+        platform: Platform,
+        build_args: Option<BuildArg>,
+        target: String,
+    ) -> Container {
+        todo!()
+    }
+
+    /// Returns a list of files and directories at the given path.
+    pub fn entries(&self, path: String) -> Option<String> {
+        todo!()
+    }
+
+    /// Writes the contents of the directory to a path on the host.
+    pub fn export(&self, path: String) -> Boolean {
+        todo!()
+    }
+
+    /// Retrieves a file at the given path.
+    pub fn file(&self, path: String) -> File {
+        todo!()
+    }
+
+    /// The content-addressed identifier of the directory.
+    pub fn id(&self) -> DirectoryID {
+        todo!()
+    }
+
+    /// load a project's metadata
+    pub fn load_project(&self, config_path: String) -> Project {
+        todo!()
+    }
+
+    /// Creates a named sub-pipeline.
+    pub fn pipeline(&self, name: String, description: String) -> Directory {
+        todo!()
+    }
+
+    /// Retrieves this directory plus a directory written at the given path.
+    /// # Arguments
+    ///
+    /// * `exclude` - Exclude artifacts that match the given pattern.
+    ///   Exclude artifacts that match the given pattern.
+    ///   (e.g. ["node_modules/", ".git*"]).
+    /// * `include` - Include only artifacts that match the given pattern.
+    ///   Include only artifacts that match the given pattern.
+    ///   (e.g. ["app/", "package.*"]).
+    pub fn with_directory(
+        &self,
+        path: String,
+        directory: DirectoryID,
+        exclude: Option<String>,
+        include: Option<String>,
+    ) -> Directory {
+        todo!()
+    }
+
+    /// Retrieves this directory plus the contents of the given file copied to the given path.
+    pub fn with_file(&self, path: String, source: FileID, permissions: Int) -> Directory {
+        todo!()
+    }
+
+    /// Retrieves this directory plus a new directory created at the given path.
+    pub fn with_new_directory(&self, path: String, permissions: Int) -> Directory {
+        todo!()
+    }
+
+    /// Retrieves this directory plus a new file written at the given path.
+    pub fn with_new_file(&self, path: String, contents: String, permissions: Int) -> Directory {
+        todo!()
+    }
+
+    /// Retrieves this directory with all file/dir timestamps set to the given time, in seconds from the Unix epoch.
+    pub fn with_timestamps(&self, timestamp: Int) -> Directory {
+        todo!()
+    }
+
+    /// Retrieves this directory with the directory at the given path removed.
+    pub fn without_directory(&self, path: String) -> Directory {
+        todo!()
+    }
+
+    /// Retrieves this directory with the file at the given path removed.
+    pub fn without_file(&self, path: String) -> Directory {
+        todo!()
+    }
+}
+
+impl Input for Directory {}
+
 /// A simple key value object that represents a label.
 pub struct Label {}
 
 impl Label {
     /// The label name.
-    pub fn name(&self) -> Option<String> {
+    pub fn name(&self) -> String {
         todo!()
     }
 
     /// The label value.
-    pub fn value(&self) -> Option<String> {
+    pub fn value(&self) -> String {
         todo!()
     }
 }
 
 impl Input for Label {}
 
-/// A reference to a secret value, which can be handled more safely than the value itself.
-pub struct Secret {}
-
-impl Secret {
-    /// The identifier for this secret.
-    pub fn id(&self) -> Option<SecretID> {
-        todo!()
-    }
-
-    /// The value of this secret.
-    pub fn plaintext(&self) -> Option<String> {
-        todo!()
-    }
-}
-
-impl Input for Secret {}
-
 /// An OCI-compatible container, also known as a docker container.
 pub struct Container {}
 
@@ -227,36 +313,36 @@ impl Container {
     ///   Target build stage to build.
     pub fn build(
         &self,
-        context: Option<DirectoryID>,
+        context: DirectoryID,
         dockerfile: String,
-        build_args: Vec<Option<BuildArg>>,
+        build_args: Option<BuildArg>,
         target: String,
-    ) -> Option<Container> {
+    ) -> Container {
         todo!()
     }
 
     /// Retrieves default arguments for future commands.
-    pub fn default_args(&self) -> Vec<Option<String>> {
+    pub fn default_args(&self) -> Option<String> {
         todo!()
     }
 
     /// Retrieves a directory at the given path. Mounts are included.
-    pub fn directory(&self, path: Option<String>) -> Option<Directory> {
+    pub fn directory(&self, path: String) -> Directory {
         todo!()
     }
 
     /// Retrieves entrypoint to be prepended to the arguments of all commands.
-    pub fn entrypoint(&self) -> Vec<Option<String>> {
+    pub fn entrypoint(&self) -> Option<String> {
         todo!()
     }
 
     /// Retrieves the value of the specified environment variable.
-    pub fn env_variable(&self, name: Option<String>) -> String {
+    pub fn env_variable(&self, name: String) -> String {
         todo!()
     }
 
     /// Retrieves the list of environment variables passed to commands.
-    pub fn env_variables(&self) -> Option<Vec<Option<EnvVariable>>> {
+    pub fn env_variables(&self) -> Option<EnvVariable> {
         todo!()
     }
 
@@ -277,12 +363,12 @@ impl Container {
     ///   The command being executed WILL BE GRANTED FULL ACCESS TO YOUR HOST FILESYSTEM.
     pub fn exec(
         &self,
-        args: Vec<Option<String>>,
+        args: Option<String>,
         stdin: String,
         redirect_stdout: String,
         redirect_stderr: String,
         experimental_privileged_nesting: Boolean,
-    ) -> Option<Container> {
+    ) -> Container {
         todo!()
     }
 
@@ -302,16 +388,12 @@ impl Container {
     /// * `platformVariants` - Identifiers for other platform specific containers.
     ///   Identifiers for other platform specific containers.
     ///   Used for multi-platform image.
-    pub fn export(
-        &self,
-        path: Option<String>,
-        platform_variants: Vec<Option<ContainerID>>,
-    ) -> Option<Boolean> {
+    pub fn export(&self, path: String, platform_variants: Option<ContainerID>) -> Boolean {
         todo!()
     }
 
     /// Retrieves a file at the given path. Mounts are included.
-    pub fn file(&self, path: Option<String>) -> Option<File> {
+    pub fn file(&self, path: String) -> File {
         todo!()
     }
 
@@ -321,42 +403,42 @@ impl Container {
     /// * `address` - Image's address from its registry.
     ///   Image's address from its registry.
     ///   Formatted as [host]/[user]/[repo]:[tag] (e.g. docker.io/dagger/dagger:main).
-    pub fn from(&self, address: Option<String>) -> Option<Container> {
+    pub fn from(&self, address: String) -> Container {
         todo!()
     }
 
     /// Retrieves this container's root filesystem. Mounts are not included.
-    pub fn fs(&self) -> Option<Directory> {
+    pub fn fs(&self) -> Directory {
         todo!()
     }
 
     /// A unique identifier for this container.
-    pub fn id(&self) -> Option<ContainerID> {
+    pub fn id(&self) -> ContainerID {
         todo!()
     }
 
     /// Retrieves the value of the specified label.
-    pub fn label(&self, name: Option<String>) -> String {
+    pub fn label(&self, name: String) -> String {
         todo!()
     }
 
     /// Retrieves the list of labels passed to container.
-    pub fn labels(&self) -> Option<Vec<Option<Label>>> {
+    pub fn labels(&self) -> Option<Label> {
         todo!()
     }
 
     /// Retrieves the list of paths where a directory is mounted.
-    pub fn mounts(&self) -> Option<Vec<Option<String>>> {
+    pub fn mounts(&self) -> Option<String> {
         todo!()
     }
 
     /// Creates a named sub-pipeline
-    pub fn pipeline(&self, name: Option<String>, description: String) -> Option<Container> {
+    pub fn pipeline(&self, name: String, description: String) -> Container {
         todo!()
     }
 
     /// The platform this container executes and publishes as.
-    pub fn platform(&self) -> Option<Platform> {
+    pub fn platform(&self) -> Platform {
         todo!()
     }
 
@@ -369,16 +451,12 @@ impl Container {
     /// * `platformVariants` - Identifiers for other platform specific containers.
     ///   Identifiers for other platform specific containers.
     ///   Used for multi-platform image.
-    pub fn publish(
-        &self,
-        address: Option<String>,
-        platform_variants: Vec<Option<ContainerID>>,
-    ) -> Option<String> {
+    pub fn publish(&self, address: String, platform_variants: Option<ContainerID>) -> String {
         todo!()
     }
 
     /// Retrieves this container's root filesystem. Mounts are not included.
-    pub fn rootfs(&self) -> Option<Directory> {
+    pub fn rootfs(&self) -> Directory {
         todo!()
     }
 
@@ -400,32 +478,28 @@ impl Container {
     }
 
     /// Configures default arguments for future commands.
-    pub fn with_default_args(&self, args: Vec<Option<String>>) -> Option<Container> {
+    pub fn with_default_args(&self, args: Option<String>) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus a directory written at the given path.
     pub fn with_directory(
         &self,
-        path: Option<String>,
-        directory: Option<DirectoryID>,
-        exclude: Vec<Option<String>>,
-        include: Vec<Option<String>>,
-    ) -> Option<Container> {
+        path: String,
+        directory: DirectoryID,
+        exclude: Option<String>,
+        include: Option<String>,
+    ) -> Container {
         todo!()
     }
 
     /// Retrieves this container but with a different command entrypoint.
-    pub fn with_entrypoint(&self, args: Option<Vec<Option<String>>>) -> Option<Container> {
+    pub fn with_entrypoint(&self, args: Option<String>) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus the given environment variable.
-    pub fn with_env_variable(
-        &self,
-        name: Option<String>,
-        value: Option<String>,
-    ) -> Option<Container> {
+    pub fn with_env_variable(&self, name: String, value: String) -> Container {
         todo!()
     }
 
@@ -446,137 +520,107 @@ impl Container {
     ///   The command being executed WILL BE GRANTED FULL ACCESS TO YOUR HOST FILESYSTEM.
     pub fn with_exec(
         &self,
-        args: Option<Vec<Option<String>>>,
+        args: Option<String>,
         stdin: String,
         redirect_stdout: String,
         redirect_stderr: String,
         experimental_privileged_nesting: Boolean,
-    ) -> Option<Container> {
+    ) -> Container {
         todo!()
     }
 
     /// Initializes this container from this DirectoryID.
-    pub fn with_fs(&self, id: Option<DirectoryID>) -> Option<Container> {
+    pub fn with_fs(&self, id: DirectoryID) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus the contents of the given file copied to the given path.
-    pub fn with_file(
-        &self,
-        path: Option<String>,
-        source: Option<FileID>,
-        permissions: Int,
-    ) -> Option<Container> {
+    pub fn with_file(&self, path: String, source: FileID, permissions: Int) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus the given label.
-    pub fn with_label(&self, name: Option<String>, value: Option<String>) -> Option<Container> {
+    pub fn with_label(&self, name: String, value: String) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus a cache volume mounted at the given path.
     pub fn with_mounted_cache(
         &self,
-        path: Option<String>,
-        cache: Option<CacheID>,
+        path: String,
+        cache: CacheID,
         source: DirectoryID,
-    ) -> Option<Container> {
+    ) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus a directory mounted at the given path.
-    pub fn with_mounted_directory(
-        &self,
-        path: Option<String>,
-        source: Option<DirectoryID>,
-    ) -> Option<Container> {
+    pub fn with_mounted_directory(&self, path: String, source: DirectoryID) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus a file mounted at the given path.
-    pub fn with_mounted_file(
-        &self,
-        path: Option<String>,
-        source: Option<FileID>,
-    ) -> Option<Container> {
+    pub fn with_mounted_file(&self, path: String, source: FileID) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus a secret mounted into a file at the given path.
-    pub fn with_mounted_secret(
-        &self,
-        path: Option<String>,
-        source: Option<SecretID>,
-    ) -> Option<Container> {
+    pub fn with_mounted_secret(&self, path: String, source: SecretID) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus a temporary directory mounted at the given path.
-    pub fn with_mounted_temp(&self, path: Option<String>) -> Option<Container> {
+    pub fn with_mounted_temp(&self, path: String) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus a new file written at the given path.
-    pub fn with_new_file(
-        &self,
-        path: Option<String>,
-        contents: String,
-        permissions: Int,
-    ) -> Option<Container> {
+    pub fn with_new_file(&self, path: String, contents: String, permissions: Int) -> Container {
         todo!()
     }
 
     /// Initializes this container from this DirectoryID.
-    pub fn with_rootfs(&self, id: Option<DirectoryID>) -> Option<Container> {
+    pub fn with_rootfs(&self, id: DirectoryID) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus an env variable containing the given secret.
-    pub fn with_secret_variable(
-        &self,
-        name: Option<String>,
-        secret: Option<SecretID>,
-    ) -> Option<Container> {
+    pub fn with_secret_variable(&self, name: String, secret: SecretID) -> Container {
         todo!()
     }
 
     /// Retrieves this container plus a socket forwarded to the given Unix socket path.
-    pub fn with_unix_socket(
-        &self,
-        path: Option<String>,
-        source: Option<SocketID>,
-    ) -> Option<Container> {
+    pub fn with_unix_socket(&self, path: String, source: SocketID) -> Container {
         todo!()
     }
 
     /// Retrieves this containers with a different command user.
-    pub fn with_user(&self, name: Option<String>) -> Option<Container> {
+    pub fn with_user(&self, name: String) -> Container {
         todo!()
     }
 
     /// Retrieves this container with a different working directory.
-    pub fn with_workdir(&self, path: Option<String>) -> Option<Container> {
+    pub fn with_workdir(&self, path: String) -> Container {
         todo!()
     }
 
     /// Retrieves this container minus the given environment variable.
-    pub fn without_env_variable(&self, name: Option<String>) -> Option<Container> {
+    pub fn without_env_variable(&self, name: String) -> Container {
         todo!()
     }
 
     /// Retrieves this container minus the given environment label.
-    pub fn without_label(&self, name: Option<String>) -> Option<Container> {
+    pub fn without_label(&self, name: String) -> Container {
         todo!()
     }
 
     /// Retrieves this container after unmounting everything at the given path.
-    pub fn without_mount(&self, path: Option<String>) -> Option<Container> {
+    pub fn without_mount(&self, path: String) -> Container {
         todo!()
     }
 
     /// Retrieves this container with a previously added Unix socket removed.
-    pub fn without_unix_socket(&self, path: Option<String>) -> Option<Container> {
+    pub fn without_unix_socket(&self, path: String) -> Container {
         todo!()
     }
 
@@ -588,192 +632,55 @@ impl Container {
 
 impl Input for Container {}
 
-/// A directory whose contents persist across runs.
-pub struct CacheVolume {}
+/// A file.
+pub struct File {}
 
-impl CacheVolume {
-    ///
-    pub fn id(&self) -> Option<CacheID> {
+impl File {
+    /// Retrieves the contents of the file.
+    pub fn contents(&self) -> String {
+        todo!()
+    }
+
+    /// Writes the file to a file path on the host.
+    pub fn export(&self, path: String) -> Boolean {
+        todo!()
+    }
+
+    /// Retrieves the content-addressed identifier of the file.
+    pub fn id(&self) -> FileID {
+        todo!()
+    }
+
+    /// Retrieves a secret referencing the contents of this file.
+    pub fn secret(&self) -> Secret {
+        todo!()
+    }
+
+    /// Gets the size of the file, in bytes.
+    pub fn size(&self) -> Int {
+        todo!()
+    }
+
+    /// Retrieves this file with its created/modified timestamps set to the given time, in seconds from the Unix epoch.
+    pub fn with_timestamps(&self, timestamp: Int) -> File {
         todo!()
     }
 }
 
-impl Input for CacheVolume {}
-
-/// A git ref (tag, branch or commit).
-pub struct GitRef {}
-
-impl GitRef {
-    /// The digest of the current value of this ref.
-    pub fn digest(&self) -> Option<String> {
-        todo!()
-    }
-
-    /// The filesystem tree at this ref.
-    pub fn tree(&self, ssh_known_hosts: String, ssh_auth_socket: SocketID) -> Option<Directory> {
-        todo!()
-    }
-}
-
-impl Input for GitRef {}
+impl Input for File {}
 
 ///
 pub struct Socket {}
 
 impl Socket {
     /// The content-addressed identifier of the socket.
-    pub fn id(&self) -> Option<SocketID> {
+    pub fn id(&self) -> SocketID {
         todo!()
     }
 }
 
 impl Input for Socket {}
 
-/// A directory.
-pub struct Directory {}
-
-impl Directory {
-    /// Gets the difference between this directory and an another directory.
-    pub fn diff(&self, other: Option<DirectoryID>) -> Option<Directory> {
-        todo!()
-    }
-
-    /// Retrieves a directory at the given path.
-    pub fn directory(&self, path: Option<String>) -> Option<Directory> {
-        todo!()
-    }
-
-    /// Builds a new Docker container from this directory.
-    /// # Arguments
-    ///
-    /// * `dockerfile` - Path to the Dockerfile to use.
-    ///   Path to the Dockerfile to use.
-    ///   Defaults to './Dockerfile'.
-    /// * `platform` - The platform to build.
-    ///   The platform to build.
-    /// * `buildArgs` - Additional build arguments.
-    ///   Additional build arguments.
-    /// * `target` - Target build stage to build.
-    ///   Target build stage to build.
-    pub fn docker_build(
-        &self,
-        dockerfile: String,
-        platform: Platform,
-        build_args: Vec<Option<BuildArg>>,
-        target: String,
-    ) -> Option<Container> {
-        todo!()
-    }
-
-    /// Returns a list of files and directories at the given path.
-    pub fn entries(&self, path: String) -> Option<Vec<Option<String>>> {
-        todo!()
-    }
-
-    /// Writes the contents of the directory to a path on the host.
-    pub fn export(&self, path: Option<String>) -> Option<Boolean> {
-        todo!()
-    }
-
-    /// Retrieves a file at the given path.
-    pub fn file(&self, path: Option<String>) -> Option<File> {
-        todo!()
-    }
-
-    /// The content-addressed identifier of the directory.
-    pub fn id(&self) -> Option<DirectoryID> {
-        todo!()
-    }
-
-    /// load a project's metadata
-    pub fn load_project(&self, config_path: Option<String>) -> Option<Project> {
-        todo!()
-    }
-
-    /// Creates a named sub-pipeline.
-    pub fn pipeline(&self, name: Option<String>, description: String) -> Option<Directory> {
-        todo!()
-    }
-
-    /// Retrieves this directory plus a directory written at the given path.
-    /// # Arguments
-    ///
-    /// * `exclude` - Exclude artifacts that match the given pattern.
-    ///   Exclude artifacts that match the given pattern.
-    ///   (e.g. ["node_modules/", ".git*"]).
-    /// * `include` - Include only artifacts that match the given pattern.
-    ///   Include only artifacts that match the given pattern.
-    ///   (e.g. ["app/", "package.*"]).
-    pub fn with_directory(
-        &self,
-        path: Option<String>,
-        directory: Option<DirectoryID>,
-        exclude: Vec<Option<String>>,
-        include: Vec<Option<String>>,
-    ) -> Option<Directory> {
-        todo!()
-    }
-
-    /// Retrieves this directory plus the contents of the given file copied to the given path.
-    pub fn with_file(
-        &self,
-        path: Option<String>,
-        source: Option<FileID>,
-        permissions: Int,
-    ) -> Option<Directory> {
-        todo!()
-    }
-
-    /// Retrieves this directory plus a new directory created at the given path.
-    pub fn with_new_directory(&self, path: Option<String>, permissions: Int) -> Option<Directory> {
-        todo!()
-    }
-
-    /// Retrieves this directory plus a new file written at the given path.
-    pub fn with_new_file(
-        &self,
-        path: Option<String>,
-        contents: Option<String>,
-        permissions: Int,
-    ) -> Option<Directory> {
-        todo!()
-    }
-
-    /// Retrieves this directory with all file/dir timestamps set to the given time, in seconds from the Unix epoch.
-    pub fn with_timestamps(&self, timestamp: Option<Int>) -> Option<Directory> {
-        todo!()
-    }
-
-    /// Retrieves this directory with the directory at the given path removed.
-    pub fn without_directory(&self, path: Option<String>) -> Option<Directory> {
-        todo!()
-    }
-
-    /// Retrieves this directory with the file at the given path removed.
-    pub fn without_file(&self, path: Option<String>) -> Option<Directory> {
-        todo!()
-    }
-}
-
-impl Input for Directory {}
-
-/// An environment variable on the host environment.
-pub struct HostVariable {}
-
-impl HostVariable {
-    /// A secret referencing the value of this variable.
-    pub fn secret(&self) -> Option<Secret> {
-        todo!()
-    }
-
-    /// The value of this variable.
-    pub fn value(&self) -> Option<String> {
-        todo!()
-    }
-}
-
-impl Input for HostVariable {}
-
 ///
 pub struct Query {}
 
@@ -783,81 +690,118 @@ impl Query {
     ///
     /// * `key` - A string identifier to target this cache volume (e.g. "myapp-cache").
     ///   A string identifier to target this cache volume (e.g. "myapp-cache").
-    pub fn cache_volume(&self, key: Option<String>) -> Option<CacheVolume> {
+    pub fn cache_volume(&self, key: String) -> CacheVolume {
         todo!()
     }
 
     /// Loads a container from ID.
     /// Null ID returns an empty container (scratch).
     /// Optional platform argument initializes new containers to execute and publish as that platform. Platform defaults to that of the builder's host.
-    pub fn container(&self, id: ContainerID, platform: Platform) -> Option<Container> {
+    pub fn container(&self, id: ContainerID, platform: Platform) -> Container {
         todo!()
     }
 
     /// The default platform of the builder.
-    pub fn default_platform(&self) -> Option<Platform> {
+    pub fn default_platform(&self) -> Platform {
         todo!()
     }
 
     /// Load a directory by ID. No argument produces an empty directory.
-    pub fn directory(&self, id: DirectoryID) -> Option<Directory> {
+    pub fn directory(&self, id: DirectoryID) -> Directory {
         todo!()
     }
 
     /// Loads a file by ID.
-    pub fn file(&self, id: Option<FileID>) -> File {
+    pub fn file(&self, id: FileID) -> File {
         todo!()
     }
 
     /// Queries a git repository.
-    pub fn git(&self, url: Option<String>, keep_git_dir: Boolean) -> Option<GitRepository> {
+    pub fn git(&self, url: String, keep_git_dir: Boolean) -> GitRepository {
         todo!()
     }
 
     /// Queries the host environment.
-    pub fn host(&self) -> Option<Host> {
+    pub fn host(&self) -> Host {
         todo!()
     }
 
     /// Returns a file containing an http remote url content.
-    pub fn http(&self, url: Option<String>) -> Option<File> {
+    pub fn http(&self, url: String) -> File {
         todo!()
     }
 
     /// Creates a named sub-pipeline
-    pub fn pipeline(&self, name: Option<String>, description: String) -> Option<Query> {
+    pub fn pipeline(&self, name: String, description: String) -> Query {
         todo!()
     }
 
     /// Look up a project by name
-    pub fn project(&self, name: Option<String>) -> Option<Project> {
+    pub fn project(&self, name: String) -> Project {
         todo!()
     }
 
     /// Loads a secret from its ID.
-    pub fn secret(&self, id: Option<SecretID>) -> Option<Secret> {
+    pub fn secret(&self, id: SecretID) -> Secret {
         todo!()
     }
 
     /// Loads a socket by its ID.
-    pub fn socket(&self, id: SocketID) -> Option<Socket> {
+    pub fn socket(&self, id: SocketID) -> Socket {
         todo!()
     }
 }
 
 impl Input for Query {}
 
+/// A set of scripts and/or extensions
+pub struct Project {}
+
+impl Project {
+    /// extensions in this project
+    pub fn extensions(&self) -> Option<Project> {
+        todo!()
+    }
+
+    /// Code files generated by the SDKs in the project
+    pub fn generated_code(&self) -> Directory {
+        todo!()
+    }
+
+    /// install the project's schema
+    pub fn install(&self) -> Boolean {
+        todo!()
+    }
+
+    /// name of the project
+    pub fn name(&self) -> String {
+        todo!()
+    }
+
+    /// schema provided by the project
+    pub fn schema(&self) -> String {
+        todo!()
+    }
+
+    /// sdk used to generate code for and/or execute this project
+    pub fn sdk(&self) -> String {
+        todo!()
+    }
+}
+
+impl Input for Project {}
+
 /// A simple key value object that represents an environment variable.
 pub struct EnvVariable {}
 
 impl EnvVariable {
     /// The environment variable name.
-    pub fn name(&self) -> Option<String> {
+    pub fn name(&self) -> String {
         todo!()
     }
 
     /// The environment variable value.
-    pub fn value(&self) -> Option<String> {
+    pub fn value(&self) -> String {
         todo!()
     }
 }