diff --git a/crates/codegen/runtime/cargo/crate/src/runtime/compilation/unit.rs b/crates/codegen/runtime/cargo/crate/src/runtime/compilation/unit.rs
index 05cf54e5a3..2e58aa002b 100644
--- a/crates/codegen/runtime/cargo/crate/src/runtime/compilation/unit.rs
+++ b/crates/codegen/runtime/cargo/crate/src/runtime/compilation/unit.rs
@@ -1,5 +1,6 @@
 // This file is generated automatically by infrastructure scripts. Please don't edit by hand.
 
+use std::collections::btree_map::Keys;
 use std::collections::BTreeMap;
 
 use crate::compilation::File;
@@ -13,7 +14,21 @@ impl CompilationUnit {
         Self { files }
     }
 
-    pub fn files(&self) -> &BTreeMap<String, File> {
-        &self.files
+    pub fn files(&self) -> FilesIterator {
+        FilesIterator {
+            inner: self.files.clone().keys(),
+        }
+    }
+}
+
+pub struct FilesIterator {
+    inner: Keys<String, File>,
+}
+
+impl Iterator for FilesIterator {
+    type Item = File;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.inner.next()
     }
 }
diff --git a/crates/codegen/runtime/cargo/wasm/src/runtime/interface/compilation.wit.jinja2 b/crates/codegen/runtime/cargo/wasm/src/runtime/interface/compilation.wit.jinja2
new file mode 100644
index 0000000000..019868110e
--- /dev/null
+++ b/crates/codegen/runtime/cargo/wasm/src/runtime/interface/compilation.wit.jinja2
@@ -0,0 +1,50 @@
+interface compilation {
+    use cst.{node, cursor};
+
+    /// A single source file in the compilation unit.
+    resource file {
+        /// Returns the unique identifier of this file.
+        id: func() -> string;
+
+        /// Returns the syntax tree of this file.
+        tree: func() -> node;
+
+        /// Creates a cursor for traversing the syntax tree of this file.
+        create-tree-cursor: func() -> cursor;
+    }
+
+    /// Contains information about imports found in an added source file.
+    record add-file-response {
+        /// List of import strings found in the added file.
+        import-strings: list<string>,
+    }
+
+    /// A builder for creating compilation units.
+    /// Allows incrementally building a transitive list of all files and their imports.
+    resource compilation-builder {
+        /// Creates a new compilation builder for the specified language version.
+        create: static func(version: string) -> result<compilation-builder, string>;
+
+        /// Adds a source file to the compilation unit.
+        add-file: func(id: string, contents: string) -> result<add-file-response, string>;
+
+        /// Adds an import relationship between files.
+        add-import: func(file-id: string, import-string: string, imported-file-id: string) -> result<_, string>;
+
+        /// Builds and returns the final compilation unit.
+        build: func() -> compilation-unit;
+    }
+
+    /// A complete compilation unit containing all source files and their relationships.
+    resource compilation-unit {
+        /// Returns a map of all files in the compilation unit, keyed by their IDs.
+        files: func() -> files-iterator;
+    }
+
+    /// Iterator over files in the compilation unit.
+    resource files-iterator {
+        /// Returns the next file or None if there are no more files.
+        next: func() -> option<file>;
+    }
+
+}
diff --git a/crates/codegen/runtime/cargo/wasm/src/runtime/interface/generated/compilation.wit b/crates/codegen/runtime/cargo/wasm/src/runtime/interface/generated/compilation.wit
new file mode 100644
index 0000000000..8e29ef2c48
--- /dev/null
+++ b/crates/codegen/runtime/cargo/wasm/src/runtime/interface/generated/compilation.wit
@@ -0,0 +1,52 @@
+// This file is generated automatically by infrastructure scripts. Please don't edit by hand.
+
+interface compilation {
+    use cst.{node, cursor};
+
+    /// A single source file in the compilation unit.
+    resource file {
+        /// Returns the unique identifier of this file.
+        id: func() -> string;
+
+        /// Returns the syntax tree of this file.
+        tree: func() -> node;
+
+        /// Creates a cursor for traversing the syntax tree of this file.
+        create-tree-cursor: func() -> cursor;
+    }
+
+    /// Contains information about imports found in an added source file.
+    record add-file-response {
+        /// List of import strings found in the added file.
+        import-strings: list<string>,
+    }
+
+    /// A builder for creating compilation units.
+    /// Allows incrementally building a transitive list of all files and their imports.
+    resource compilation-builder {
+        /// Creates a new compilation builder for the specified language version.
+        create: static func(version: string) -> result<compilation-builder, string>;
+
+        /// Adds a source file to the compilation unit.
+        add-file: func(id: string, contents: string) -> result<add-file-response, string>;
+
+        /// Adds an import relationship between files.
+        add-import: func(file-id: string, import-string: string, imported-file-id: string) -> result<_, string>;
+
+        /// Builds and returns the final compilation unit.
+        build: func() -> compilation-unit;
+    }
+
+    /// A complete compilation unit containing all source files and their relationships.
+    resource compilation-unit {
+        /// Returns a map of all files in the compilation unit, keyed by their IDs.
+        files: func() -> files-iterator;
+    }
+
+    /// Iterator over files in the compilation unit.
+    resource files-iterator {
+        /// Returns the next file or None if there are no more files.
+        next: func() -> option<file>;
+    }
+
+}
diff --git a/crates/codegen/runtime/cargo/wasm/src/runtime/interface/generated/world.wit b/crates/codegen/runtime/cargo/wasm/src/runtime/interface/generated/world.wit
index 287bf6aa6a..13f1b36316 100644
--- a/crates/codegen/runtime/cargo/wasm/src/runtime/interface/generated/world.wit
+++ b/crates/codegen/runtime/cargo/wasm/src/runtime/interface/generated/world.wit
@@ -4,6 +4,7 @@ package nomic-foundation:slang;
 
 world slang {
     export ast;
+    export compilation;
     export cst;
     export parser;
     export utils;
diff --git a/crates/codegen/runtime/cargo/wasm/src/runtime/interface/world.wit.jinja2 b/crates/codegen/runtime/cargo/wasm/src/runtime/interface/world.wit.jinja2
index ed0bb2f9af..943d78cac7 100644
--- a/crates/codegen/runtime/cargo/wasm/src/runtime/interface/world.wit.jinja2
+++ b/crates/codegen/runtime/cargo/wasm/src/runtime/interface/world.wit.jinja2
@@ -2,6 +2,7 @@ package nomic-foundation:slang;
 
 world slang {
     export ast;
+    export compilation;
     export cst;
     export parser;
     export utils;
diff --git a/crates/solidity/outputs/cargo/crate/src/generated/compilation/unit.rs b/crates/solidity/outputs/cargo/crate/src/generated/compilation/unit.rs
index 111129f781..f7119c89d2 100644
--- a/crates/solidity/outputs/cargo/crate/src/generated/compilation/unit.rs
+++ b/crates/solidity/outputs/cargo/crate/src/generated/compilation/unit.rs
@@ -2,6 +2,7 @@
 
 // This file is generated automatically by infrastructure scripts. Please don't edit by hand.
 
+use std::collections::btree_map::Keys;
 use std::collections::BTreeMap;
 
 use crate::compilation::File;
@@ -15,7 +16,21 @@ impl CompilationUnit {
         Self { files }
     }
 
-    pub fn files(&self) -> &BTreeMap<String, File> {
-        &self.files
+    pub fn files(&self) -> FilesIterator {
+        FilesIterator {
+            inner: self.files.clone().keys(),
+        }
+    }
+}
+
+pub struct FilesIterator {
+    inner: Keys<String, File>,
+}
+
+impl Iterator for FilesIterator {
+    type Item = File;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.inner.next()
     }
 }
diff --git a/crates/solidity/outputs/cargo/wasm/src/generated/interface/generated/compilation.wit b/crates/solidity/outputs/cargo/wasm/src/generated/interface/generated/compilation.wit
new file mode 100644
index 0000000000..8e29ef2c48
--- /dev/null
+++ b/crates/solidity/outputs/cargo/wasm/src/generated/interface/generated/compilation.wit
@@ -0,0 +1,52 @@
+// This file is generated automatically by infrastructure scripts. Please don't edit by hand.
+
+interface compilation {
+    use cst.{node, cursor};
+
+    /// A single source file in the compilation unit.
+    resource file {
+        /// Returns the unique identifier of this file.
+        id: func() -> string;
+
+        /// Returns the syntax tree of this file.
+        tree: func() -> node;
+
+        /// Creates a cursor for traversing the syntax tree of this file.
+        create-tree-cursor: func() -> cursor;
+    }
+
+    /// Contains information about imports found in an added source file.
+    record add-file-response {
+        /// List of import strings found in the added file.
+        import-strings: list<string>,
+    }
+
+    /// A builder for creating compilation units.
+    /// Allows incrementally building a transitive list of all files and their imports.
+    resource compilation-builder {
+        /// Creates a new compilation builder for the specified language version.
+        create: static func(version: string) -> result<compilation-builder, string>;
+
+        /// Adds a source file to the compilation unit.
+        add-file: func(id: string, contents: string) -> result<add-file-response, string>;
+
+        /// Adds an import relationship between files.
+        add-import: func(file-id: string, import-string: string, imported-file-id: string) -> result<_, string>;
+
+        /// Builds and returns the final compilation unit.
+        build: func() -> compilation-unit;
+    }
+
+    /// A complete compilation unit containing all source files and their relationships.
+    resource compilation-unit {
+        /// Returns a map of all files in the compilation unit, keyed by their IDs.
+        files: func() -> files-iterator;
+    }
+
+    /// Iterator over files in the compilation unit.
+    resource files-iterator {
+        /// Returns the next file or None if there are no more files.
+        next: func() -> option<file>;
+    }
+
+}
diff --git a/crates/solidity/outputs/cargo/wasm/src/generated/interface/generated/world.wit b/crates/solidity/outputs/cargo/wasm/src/generated/interface/generated/world.wit
index 287bf6aa6a..13f1b36316 100644
--- a/crates/solidity/outputs/cargo/wasm/src/generated/interface/generated/world.wit
+++ b/crates/solidity/outputs/cargo/wasm/src/generated/interface/generated/world.wit
@@ -4,6 +4,7 @@ package nomic-foundation:slang;
 
 world slang {
     export ast;
+    export compilation;
     export cst;
     export parser;
     export utils;
diff --git a/crates/testlang/outputs/cargo/crate/src/generated/compilation/unit.rs b/crates/testlang/outputs/cargo/crate/src/generated/compilation/unit.rs
index 111129f781..f7119c89d2 100644
--- a/crates/testlang/outputs/cargo/crate/src/generated/compilation/unit.rs
+++ b/crates/testlang/outputs/cargo/crate/src/generated/compilation/unit.rs
@@ -2,6 +2,7 @@
 
 // This file is generated automatically by infrastructure scripts. Please don't edit by hand.
 
+use std::collections::btree_map::Keys;
 use std::collections::BTreeMap;
 
 use crate::compilation::File;
@@ -15,7 +16,21 @@ impl CompilationUnit {
         Self { files }
     }
 
-    pub fn files(&self) -> &BTreeMap<String, File> {
-        &self.files
+    pub fn files(&self) -> FilesIterator {
+        FilesIterator {
+            inner: self.files.clone().keys(),
+        }
+    }
+}
+
+pub struct FilesIterator {
+    inner: Keys<String, File>,
+}
+
+impl Iterator for FilesIterator {
+    type Item = File;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.inner.next()
     }
 }
diff --git a/crates/testlang/outputs/cargo/wasm/src/generated/interface/generated/compilation.wit b/crates/testlang/outputs/cargo/wasm/src/generated/interface/generated/compilation.wit
new file mode 100644
index 0000000000..8e29ef2c48
--- /dev/null
+++ b/crates/testlang/outputs/cargo/wasm/src/generated/interface/generated/compilation.wit
@@ -0,0 +1,52 @@
+// This file is generated automatically by infrastructure scripts. Please don't edit by hand.
+
+interface compilation {
+    use cst.{node, cursor};
+
+    /// A single source file in the compilation unit.
+    resource file {
+        /// Returns the unique identifier of this file.
+        id: func() -> string;
+
+        /// Returns the syntax tree of this file.
+        tree: func() -> node;
+
+        /// Creates a cursor for traversing the syntax tree of this file.
+        create-tree-cursor: func() -> cursor;
+    }
+
+    /// Contains information about imports found in an added source file.
+    record add-file-response {
+        /// List of import strings found in the added file.
+        import-strings: list<string>,
+    }
+
+    /// A builder for creating compilation units.
+    /// Allows incrementally building a transitive list of all files and their imports.
+    resource compilation-builder {
+        /// Creates a new compilation builder for the specified language version.
+        create: static func(version: string) -> result<compilation-builder, string>;
+
+        /// Adds a source file to the compilation unit.
+        add-file: func(id: string, contents: string) -> result<add-file-response, string>;
+
+        /// Adds an import relationship between files.
+        add-import: func(file-id: string, import-string: string, imported-file-id: string) -> result<_, string>;
+
+        /// Builds and returns the final compilation unit.
+        build: func() -> compilation-unit;
+    }
+
+    /// A complete compilation unit containing all source files and their relationships.
+    resource compilation-unit {
+        /// Returns a map of all files in the compilation unit, keyed by their IDs.
+        files: func() -> files-iterator;
+    }
+
+    /// Iterator over files in the compilation unit.
+    resource files-iterator {
+        /// Returns the next file or None if there are no more files.
+        next: func() -> option<file>;
+    }
+
+}
diff --git a/crates/testlang/outputs/cargo/wasm/src/generated/interface/generated/world.wit b/crates/testlang/outputs/cargo/wasm/src/generated/interface/generated/world.wit
index 287bf6aa6a..13f1b36316 100644
--- a/crates/testlang/outputs/cargo/wasm/src/generated/interface/generated/world.wit
+++ b/crates/testlang/outputs/cargo/wasm/src/generated/interface/generated/world.wit
@@ -4,6 +4,7 @@ package nomic-foundation:slang;
 
 world slang {
     export ast;
+    export compilation;
     export cst;
     export parser;
     export utils;