From 94ca8de6bc11f194bdf3a0415aad2eb66e222c45 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Fri, 4 Sep 2026 15:22:06 +0100
Subject: Add custom code to TypeScript output

---
 .../output/lang/typescript/TypescriptWriter.java   | 37 +++++++++++++++-------
 .../lang/typescript/ast/TypescriptCustomArea.java  | 32 +++++++++++++++++++
 2 files changed, 57 insertions(+), 12 deletions(-)
 create mode 100644 src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptCustomArea.java

(limited to 'src/main/java')

diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/TypescriptWriter.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/TypescriptWriter.java
index ebb7aba..d177b58 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/TypescriptWriter.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/TypescriptWriter.java
@@ -48,20 +48,24 @@ public class TypescriptWriter implements AutoCloseable {
     public void writeModule(TypescriptModule module) throws IOException {
         this.writer.writeHeader();
 
-        if (module.body().isEmpty()) {
-            return;
-        }
+        writeCustomArea(new TypescriptCustomArea("imports"));
+        this.writer.newLine();
 
-        writeWithSeparator(
-            module.body(),
-            this::writeStatement,
-            () -> {
-                writer.newLine();
-                writer.newLine();
-            }
-        );
+        if (!module.body().isEmpty()) {
+            writeWithSeparator(
+                module.body(),
+                this::writeStatement,
+                () -> {
+                    writer.newLine();
+                    writer.newLine();
+                }
+            );
 
-        this.writer.newLine();
+            this.writer.newLine();
+            this.writer.newLine();
+        }
+
+        writeCustomArea(new TypescriptCustomArea("body"));
     }
 
     // == Statements ==
@@ -117,8 +121,11 @@ public class TypescriptWriter implements AutoCloseable {
                 }
             );
             this.writer.newLine();
+            this.writer.newLine();
         }
 
+        writeCustomArea(new TypescriptCustomArea(classDeclaration.name().value() + ", body"));
+
         this.writer.dedent();
         this.writer.write("}");
     }
@@ -440,4 +447,10 @@ public class TypescriptWriter implements AutoCloseable {
     private void writeIdentifier(TypescriptIdentifier name) throws IOException {
         this.writer.write(name.value());
     }
+
+    // == Custom areas ==
+
+    private void writeCustomArea(TypescriptCustomArea customArea) throws IOException {
+        this.writer.writeCustomArea(customArea.name());
+    }
 }
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptCustomArea.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptCustomArea.java
new file mode 100644
index 0000000..cd3fd54
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptCustomArea.java
@@ -0,0 +1,32 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.typescript.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea imports
+
+public record TypescriptCustomArea(
+    String name
+) {
+    public static org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea.Builder arbitrary() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea.Builder("");
+    }
+
+    public record Builder(
+        String name
+    ) {
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea build() {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea(name);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea.Builder withName(String name) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea.Builder(name);
+        }
+
+        // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea.Builder body
+        // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea.Builder body
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptCustomArea body
+}
-- 
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