diff --git a/crates/dagger-codegen/src/handlers/type_ref.rs b/crates/dagger-codegen/src/handlers/type_ref.rs
index 05a4b7e..b7c45e6 100644
--- a/crates/dagger-codegen/src/handlers/type_ref.rs
+++ b/crates/dagger-codegen/src/handlers/type_ref.rs
@@ -6,14 +6,33 @@ use crate::predicates::{
     is_custom_scalar_type_ref, is_list_type, is_required_type_ref, is_scalar_type_ref,
 };
 
+//fn optional(t: rust::Tokens) -> impl FormatInto<Rust> {
+//    quote_fn! {"Option<$[const](t)>"}
+//}
+//
+//fn required(t: rust::Tokens) -> impl FormatInto<Rust> {
+//    quote_fn! {"$[const](t)"}
+//}
+
 pub fn render_type_ref(inner: &TypeRef) -> eyre::Result<rust::Tokens> {
     let extract_of_type = |t: &TypeRef| -> Option<TypeRef> {
         return t.clone().of_type.map(|t| *t);
     };
 
+    let (optional, inner) = if !is_required_type_ref(inner) {
+        (true, inner.clone())
+    } else {
+        (false, extract_of_type(inner).unwrap())
+    };
+
     if is_list_type(&inner) {
-        if let Some(inner_of_type) = extract_of_type(inner) {
+        if let Some(inner_of_type) = extract_of_type(&inner) {
             let inner_field = render_type_ref(&inner_of_type)?;
+            if optional {
+                return Ok(quote! {
+                    Option<Vec<$inner_field>>
+                });
+            }
             return Ok(quote! {
                 Vec<$inner_field>
             });
@@ -21,8 +40,13 @@ pub fn render_type_ref(inner: &TypeRef) -> eyre::Result<rust::Tokens> {
     }
 
     if is_custom_scalar_type_ref(&inner) {
-        if let Some(inner_of_type) = extract_of_type(inner) {
+        if let Some(inner_of_type) = extract_of_type(&inner) {
             let inner_field = render_type_ref(&inner_of_type)?;
+            if optional {
+                return Ok(quote! {
+                    Option<$inner_field>
+                });
+            }
             return Ok(quote! {
                 $inner_field
             });
@@ -44,25 +68,34 @@ pub fn render_type_ref(inner: &TypeRef) -> eyre::Result<rust::Tokens> {
             _ => eyre::bail!("missing type in the end of chain"),
         };
 
+        if optional {
+            return Ok(quote! {
+                Option<$name>
+            });
+        }
+
         return Ok(quote! {
             $name
         });
     }
 
-    if !is_required_type_ref(inner) {
-        if let Some(inner_of_type) = extract_of_type(inner) {
-            let inner_field = render_type_ref(&inner_of_type)?;
+    if let Some(inner_type) = inner.of_type.as_ref() {
+        let inner_field = render_type_ref(&inner_type)?;
+        if optional {
             return Ok(quote! {
                 Option<$inner_field>
             });
         }
-    }
 
-    if let Some(inner_type) = inner.of_type.as_ref() {
-        return render_type_ref(&inner_type);
+        return Ok(inner_field);
     }
 
     if let Some(name) = inner.name.as_ref() {
+        if optional {
+            return Ok(quote! {
+                Option<$name>
+            });
+        }
         return Ok(quote! {
             $name
         });
diff --git a/crates/dagger-sdk/src/gen.rs b/crates/dagger-sdk/src/gen.rs
index e87d386..9186a35 100644
--- a/crates/dagger-sdk/src/gen.rs
+++ b/crates/dagger-sdk/src/gen.rs
@@ -2,28 +2,28 @@ use dagger_core::{Boolean, Input, Int, Scalar};
 
 // code generated by dagger. DO NOT EDIT.
 
-/// A unique identifier for a secret.
-pub struct SecretID(Scalar);
-
-/// The platform config OS and architecture in a Container.
-/// The format is [os]/[platform]/[version] (e.g. darwin/arm64/v7, windows/amd64, linux/arm64).
-pub struct Platform(Scalar);
-
-/// A file identifier.
-pub struct FileID(Scalar);
-
-/// A content-addressed directory identifier.
-pub struct DirectoryID(Scalar);
+/// A content-addressed socket identifier.
+pub struct SocketID(Scalar);
 
 /// A unique container identifier. Null designates an empty container (scratch).
 pub struct ContainerID(Scalar);
 
-/// A content-addressed socket identifier.
-pub struct SocketID(Scalar);
+/// A content-addressed directory identifier.
+pub struct DirectoryID(Scalar);
+
+/// A file identifier.
+pub struct FileID(Scalar);
+
+/// A unique identifier for a secret.
+pub struct SecretID(Scalar);
 
 /// A global cache volume identifier.
 pub struct CacheID(Scalar);
 
+/// The platform config OS and architecture in a Container.
+/// The format is [os]/[platform]/[version] (e.g. darwin/arm64/v7, windows/amd64, linux/arm64).
+pub struct Platform(Scalar);
+
 ///
 pub struct BuildArg {
     pub name: String,
@@ -33,12 +33,29 @@ pub struct BuildArg {
 
 impl Input for BuildArg {}
 
+/// 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) -> SecretID {
+        todo!()
+    }
+
+    /// The value of this secret.
+    pub fn plaintext(&self) -> String {
+        todo!()
+    }
+}
+
+impl Input for Secret {}
+
 /// A set of scripts and/or extensions
 pub struct Project {}
 
 impl Project {
     /// extensions in this project
-    pub fn extensions(&self) -> Vec<Project> {
+    pub fn extensions(&self) -> Option<Vec<Project>> {
         todo!()
     }
 
@@ -58,61 +75,289 @@ impl Project {
     }
 
     /// schema provided by the project
-    pub fn schema(&self) -> String {
+    pub fn schema(&self) -> Option<String> {
         todo!()
     }
 
     /// sdk used to generate code for and/or execute this project
-    pub fn sdk(&self) -> String {
+    pub fn sdk(&self) -> Option<String> {
         todo!()
     }
 }
 
 impl Input for Project {}
 
-/// A simple key value object that represents a label.
-pub struct Label {}
+/// A file.
+pub struct File {}
 
-impl Label {
-    /// The label name.
+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 File {}
+
+/// A simple key value object that represents an environment variable.
+pub struct EnvVariable {}
+
+impl EnvVariable {
+    /// The environment variable name.
     pub fn name(&self) -> String {
         todo!()
     }
 
-    /// The label value.
+    /// The environment variable value.
     pub fn value(&self) -> String {
         todo!()
     }
 }
 
-impl Input for Label {}
+impl Input for EnvVariable {}
 
-/// Information about the host execution environment.
-pub struct Host {}
+/// A directory.
+pub struct Directory {}
 
-impl Host {
-    /// Accesses a directory on the host.
-    pub fn directory(&self, path: String, exclude: Vec<String>, include: Vec<String>) -> Directory {
+impl Directory {
+    /// Gets the difference between this directory and an another directory.
+    pub fn diff(&self, other: DirectoryID) -> Directory {
         todo!()
     }
 
-    /// Accesses an environment variable on the host.
-    pub fn env_variable(&self, name: String) -> HostVariable {
+    /// Retrieves a directory at the given path.
+    pub fn directory(&self, path: String) -> Directory {
         todo!()
     }
 
-    /// Accesses a Unix socket on the host.
-    pub fn unix_socket(&self, path: String) -> Socket {
+    /// Builds a new Docker container from this directory.
+    /// # Arguments
+    ///
+    /// * `dockerfile` - Path to the Dockerfile to use.
+    ///   Defaults to './Dockerfile'.
+    /// * `platform` - The platform to build.
+    /// * `buildArgs` - Additional build arguments.
+    /// * `target` - Target build stage to build.
+    pub fn docker_build(
+        &self,
+        dockerfile: Option<String>,
+        platform: Option<Platform>,
+        build_args: Option<Vec<BuildArg>>,
+        target: Option<String>,
+    ) -> Container {
         todo!()
     }
 
-    /// Retrieves the current working directory on the host.
-    pub fn workdir(&self, exclude: Vec<String>, include: Vec<String>) -> Directory {
+    /// Returns a list of files and directories at the given path.
+    pub fn entries(&self, path: Option<String>) -> Vec<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: Option<String>) -> Directory {
+        todo!()
+    }
+
+    /// Retrieves this directory plus a directory written at the given path.
+    /// # Arguments
+    ///
+    /// * `exclude` - Exclude artifacts that match the given pattern.
+    ///   (e.g. ["node_modules/", ".git*"]).
+    /// * `include` - Include only artifacts that match the given pattern.
+    ///   (e.g. ["app/", "package.*"]).
+    pub fn with_directory(
+        &self,
+        path: String,
+        directory: DirectoryID,
+        exclude: Option<Vec<String>>,
+        include: Option<Vec<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: Option<Int>) -> Directory {
+        todo!()
+    }
+
+    /// Retrieves this directory plus a new directory created at the given path.
+    pub fn with_new_directory(&self, path: String, permissions: Option<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: Option<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 Host {}
+impl Input for Directory {}
+
+///
+pub struct Query {}
+
+impl Query {
+    /// Constructs a cache volume for a given cache key.
+    /// # Arguments
+    ///
+    /// * `key` - A string identifier to target this cache volume (e.g. "myapp-cache").
+    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: Option<ContainerID>, platform: Option<Platform>) -> Container {
+        todo!()
+    }
+
+    /// The default platform of the builder.
+    pub fn default_platform(&self) -> Platform {
+        todo!()
+    }
+
+    /// Load a directory by ID. No argument produces an empty directory.
+    pub fn directory(&self, id: Option<DirectoryID>) -> Directory {
+        todo!()
+    }
+
+    /// Loads a file by ID.
+    pub fn file(&self, id: FileID) -> Option<File> {
+        todo!()
+    }
+
+    /// Queries a git repository.
+    pub fn git(&self, url: String, keep_git_dir: Option<Boolean>) -> GitRepository {
+        todo!()
+    }
+
+    /// Queries the host environment.
+    pub fn host(&self) -> Host {
+        todo!()
+    }
+
+    /// Returns a file containing an http remote url content.
+    pub fn http(&self, url: String) -> File {
+        todo!()
+    }
+
+    /// Creates a named sub-pipeline
+    pub fn pipeline(&self, name: String, description: Option<String>) -> Query {
+        todo!()
+    }
+
+    /// Look up a project by name
+    pub fn project(&self, name: String) -> Project {
+        todo!()
+    }
+
+    /// Loads a secret from its ID.
+    pub fn secret(&self, id: SecretID) -> Secret {
+        todo!()
+    }
+
+    /// Loads a socket by its ID.
+    pub fn socket(&self, id: Option<SocketID>) -> Socket {
+        todo!()
+    }
+}
+
+impl Input for Query {}
+
+/// 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 {}
 
 /// An OCI-compatible container, also known as a docker container.
 pub struct Container {}
@@ -129,15 +374,15 @@ impl Container {
     pub fn build(
         &self,
         context: DirectoryID,
-        dockerfile: String,
-        build_args: Vec<BuildArg>,
-        target: String,
+        dockerfile: Option<String>,
+        build_args: Option<Vec<BuildArg>>,
+        target: Option<String>,
     ) -> Container {
         todo!()
     }
 
     /// Retrieves default arguments for future commands.
-    pub fn default_args(&self) -> Vec<String> {
+    pub fn default_args(&self) -> Option<Vec<String>> {
         todo!()
     }
 
@@ -147,12 +392,12 @@ impl Container {
     }
 
     /// Retrieves entrypoint to be prepended to the arguments of all commands.
-    pub fn entrypoint(&self) -> Vec<String> {
+    pub fn entrypoint(&self) -> Option<Vec<String>> {
         todo!()
     }
 
     /// Retrieves the value of the specified environment variable.
-    pub fn env_variable(&self, name: String) -> String {
+    pub fn env_variable(&self, name: String) -> Option<String> {
         todo!()
     }
 
@@ -173,18 +418,18 @@ impl Container {
     ///   The command being executed WILL BE GRANTED FULL ACCESS TO YOUR HOST FILESYSTEM.
     pub fn exec(
         &self,
-        args: Vec<String>,
-        stdin: String,
-        redirect_stdout: String,
-        redirect_stderr: String,
-        experimental_privileged_nesting: Boolean,
+        args: Option<Vec<String>>,
+        stdin: Option<String>,
+        redirect_stdout: Option<String>,
+        redirect_stderr: Option<String>,
+        experimental_privileged_nesting: Option<Boolean>,
     ) -> Container {
         todo!()
     }
 
     /// Exit code of the last executed command. Zero means success.
     /// Null if no command has been executed.
-    pub fn exit_code(&self) -> Int {
+    pub fn exit_code(&self) -> Option<Int> {
         todo!()
     }
 
@@ -196,7 +441,7 @@ impl Container {
     ///   Path can be relative to the engine's workdir or absolute.
     /// * `platformVariants` - Identifiers for other platform specific containers.
     ///   Used for multi-platform image.
-    pub fn export(&self, path: String, platform_variants: Vec<ContainerID>) -> Boolean {
+    pub fn export(&self, path: String, platform_variants: Option<Vec<ContainerID>>) -> Boolean {
         todo!()
     }
 
@@ -225,7 +470,7 @@ impl Container {
     }
 
     /// Retrieves the value of the specified label.
-    pub fn label(&self, name: String) -> String {
+    pub fn label(&self, name: String) -> Option<String> {
         todo!()
     }
 
@@ -240,7 +485,7 @@ impl Container {
     }
 
     /// Creates a named sub-pipeline
-    pub fn pipeline(&self, name: String, description: String) -> Container {
+    pub fn pipeline(&self, name: String, description: Option<String>) -> Container {
         todo!()
     }
 
@@ -256,7 +501,7 @@ impl Container {
     ///   Formatted as [host]/[user]/[repo]:[tag] (e.g. docker.io/dagger/dagger:main).
     /// * `platformVariants` - Identifiers for other platform specific containers.
     ///   Used for multi-platform image.
-    pub fn publish(&self, address: String, platform_variants: Vec<ContainerID>) -> String {
+    pub fn publish(&self, address: String, platform_variants: Option<Vec<ContainerID>>) -> String {
         todo!()
     }
 
@@ -267,23 +512,23 @@ impl Container {
 
     /// The error stream of the last executed command.
     /// Null if no command has been executed.
-    pub fn stderr(&self) -> String {
+    pub fn stderr(&self) -> Option<String> {
         todo!()
     }
 
     /// The output stream of the last executed command.
     /// Null if no command has been executed.
-    pub fn stdout(&self) -> String {
+    pub fn stdout(&self) -> Option<String> {
         todo!()
     }
 
     /// Retrieves the user to be set for all commands.
-    pub fn user(&self) -> String {
+    pub fn user(&self) -> Option<String> {
         todo!()
     }
 
     /// Configures default arguments for future commands.
-    pub fn with_default_args(&self, args: Vec<String>) -> Container {
+    pub fn with_default_args(&self, args: Option<Vec<String>>) -> Container {
         todo!()
     }
 
@@ -292,8 +537,8 @@ impl Container {
         &self,
         path: String,
         directory: DirectoryID,
-        exclude: Vec<String>,
-        include: Vec<String>,
+        exclude: Option<Vec<String>>,
+        include: Option<Vec<String>>,
     ) -> Container {
         todo!()
     }
@@ -321,10 +566,10 @@ impl Container {
     pub fn with_exec(
         &self,
         args: Vec<String>,
-        stdin: String,
-        redirect_stdout: String,
-        redirect_stderr: String,
-        experimental_privileged_nesting: Boolean,
+        stdin: Option<String>,
+        redirect_stdout: Option<String>,
+        redirect_stderr: Option<String>,
+        experimental_privileged_nesting: Option<Boolean>,
     ) -> Container {
         todo!()
     }
@@ -335,7 +580,7 @@ impl Container {
     }
 
     /// Retrieves this container plus the contents of the given file copied to the given path.
-    pub fn with_file(&self, path: String, source: FileID, permissions: Int) -> Container {
+    pub fn with_file(&self, path: String, source: FileID, permissions: Option<Int>) -> Container {
         todo!()
     }
 
@@ -349,7 +594,7 @@ impl Container {
         &self,
         path: String,
         cache: CacheID,
-        source: DirectoryID,
+        source: Option<DirectoryID>,
     ) -> Container {
         todo!()
     }
@@ -375,7 +620,12 @@ impl Container {
     }
 
     /// Retrieves this container plus a new file written at the given path.
-    pub fn with_new_file(&self, path: String, contents: String, permissions: Int) -> Container {
+    pub fn with_new_file(
+        &self,
+        path: String,
+        contents: Option<String>,
+        permissions: Option<Int>,
+    ) -> Container {
         todo!()
     }
 
@@ -425,121 +675,94 @@ impl Container {
     }
 
     /// Retrieves the working directory for all commands.
-    pub fn workdir(&self) -> String {
+    pub fn workdir(&self) -> Option<String> {
         todo!()
     }
 }
 
 impl Input for Container {}
 
+/// 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: Option<String>,
+        ssh_auth_socket: Option<SocketID>,
+    ) -> Directory {
+        todo!()
+    }
+}
+
+impl Input for GitRef {}
+
+/// A simple key value object that represents a label.
+pub struct Label {}
+
+impl Label {
+    /// The label name.
+    pub fn name(&self) -> String {
+        todo!()
+    }
+
+    /// The label value.
+    pub fn value(&self) -> String {
+        todo!()
+    }
+}
+
+impl Input for Label {}
+
+/// Information about the host execution environment.
+pub struct Host {}
+
+impl Host {
+    /// Accesses a directory on the host.
+    pub fn directory(
+        &self,
+        path: String,
+        exclude: Option<Vec<String>>,
+        include: Option<Vec<String>>,
+    ) -> Directory {
+        todo!()
+    }
+
+    /// Accesses an environment variable on the host.
+    pub fn env_variable(&self, name: String) -> Option<HostVariable> {
+        todo!()
+    }
+
+    /// Accesses a Unix socket on the host.
+    pub fn unix_socket(&self, path: String) -> Socket {
+        todo!()
+    }
+
+    /// Retrieves the current working directory on the host.
+    pub fn workdir(&self, exclude: Option<Vec<String>>, include: Option<Vec<String>>) -> Directory {
+        todo!()
+    }
+}
+
+impl Input for Host {}
+
 ///
-pub struct Query {}
+pub struct Socket {}
 
-impl Query {
-    /// Constructs a cache volume for a given cache key.
-    /// # Arguments
-    ///
-    /// * `key` - A string identifier to target this cache volume (e.g. "myapp-cache").
-    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) -> Container {
-        todo!()
-    }
-
-    /// The default platform of the builder.
-    pub fn default_platform(&self) -> Platform {
-        todo!()
-    }
-
-    /// Load a directory by ID. No argument produces an empty directory.
-    pub fn directory(&self, id: DirectoryID) -> Directory {
-        todo!()
-    }
-
-    /// Loads a file by ID.
-    pub fn file(&self, id: FileID) -> File {
-        todo!()
-    }
-
-    /// Queries a git repository.
-    pub fn git(&self, url: String, keep_git_dir: Boolean) -> GitRepository {
-        todo!()
-    }
-
-    /// Queries the host environment.
-    pub fn host(&self) -> Host {
-        todo!()
-    }
-
-    /// Returns a file containing an http remote url content.
-    pub fn http(&self, url: String) -> File {
-        todo!()
-    }
-
-    /// Creates a named sub-pipeline
-    pub fn pipeline(&self, name: String, description: String) -> Query {
-        todo!()
-    }
-
-    /// Look up a project by name
-    pub fn project(&self, name: String) -> Project {
-        todo!()
-    }
-
-    /// Loads a secret from its ID.
-    pub fn secret(&self, id: SecretID) -> Secret {
-        todo!()
-    }
-
-    /// Loads a socket by its ID.
-    pub fn socket(&self, id: SocketID) -> Socket {
+impl Socket {
+    /// The content-addressed identifier of the socket.
+    pub fn id(&self) -> SocketID {
         todo!()
     }
 }
 
-impl Input for Query {}
-
-/// A file.
-pub struct File {}
-
-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 File {}
+impl Input for Socket {}
 
 /// A git repository.
 pub struct GitRepository {}
@@ -572,207 +795,3 @@ impl GitRepository {
 }
 
 impl Input for GitRepository {}
-
-/// A directory whose contents persist across runs.
-pub struct CacheVolume {}
-
-impl CacheVolume {
-    ///
-    pub fn id(&self) -> CacheID {
-        todo!()
-    }
-}
-
-impl Input for CacheVolume {}
-
-/// 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 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) -> SecretID {
-        todo!()
-    }
-
-    /// The value of this secret.
-    pub fn plaintext(&self) -> String {
-        todo!()
-    }
-}
-
-impl Input for Secret {}
-
-/// A simple key value object that represents an environment variable.
-pub struct EnvVariable {}
-
-impl EnvVariable {
-    /// The environment variable name.
-    pub fn name(&self) -> String {
-        todo!()
-    }
-
-    /// The environment variable value.
-    pub fn value(&self) -> String {
-        todo!()
-    }
-}
-
-impl Input for EnvVariable {}
-
-/// 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.
-    ///   Defaults to './Dockerfile'.
-    /// * `platform` - The platform to build.
-    /// * `buildArgs` - Additional build arguments.
-    /// * `target` - Target build stage to build.
-    pub fn docker_build(
-        &self,
-        dockerfile: String,
-        platform: Platform,
-        build_args: Vec<BuildArg>,
-        target: String,
-    ) -> Container {
-        todo!()
-    }
-
-    /// Returns a list of files and directories at the given path.
-    pub fn entries(&self, path: String) -> Vec<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.
-    ///   (e.g. ["node_modules/", ".git*"]).
-    /// * `include` - Include only artifacts that match the given pattern.
-    ///   (e.g. ["app/", "package.*"]).
-    pub fn with_directory(
-        &self,
-        path: String,
-        directory: DirectoryID,
-        exclude: Vec<String>,
-        include: Vec<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 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 {}
-
-///
-pub struct Socket {}
-
-impl Socket {
-    /// The content-addressed identifier of the socket.
-    pub fn id(&self) -> SocketID {
-        todo!()
-    }
-}
-
-impl Input for Socket {}