From d8771a35c842daab25d6e02df99855ef1e41b740 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 30 Aug 2026 08:58:39 +0100
Subject: Add optional type to TypeScript class field declarations

---
 .../output/lang/typescript/TypescriptWriter.java   | 13 ++++++++
 .../ast/TypescriptClassFieldDeclaration.java       | 28 ++++++++++++-----
 .../lang/typescript/ast/TypescriptExpression.java  |  2 +-
 .../output/lang/typescript/ast/TypescriptRef.java  | 36 ++++++++++++++++++++++
 4 files changed, 71 insertions(+), 8 deletions(-)
 create mode 100644 src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptRef.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 851311e..597c00b 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
@@ -113,6 +113,11 @@ public class TypescriptWriter implements AutoCloseable {
     ) throws IOException {
         this.writeIdentifier(fieldDeclaration.name());
 
+        if (fieldDeclaration.type().isPresent()) {
+            this.writer.write(": ");
+            this.writeExpression(fieldDeclaration.type().get());
+        }
+
         if (fieldDeclaration.initialValue().isPresent()) {
             this.writer.write(" = ");
             this.writeExpression(fieldDeclaration.initialValue().get());
@@ -128,6 +133,10 @@ public class TypescriptWriter implements AutoCloseable {
             case TypescriptNumberLiteral numberLiteral -> {
                 this.writeNumberLiteral(numberLiteral);
             }
+
+            case TypescriptRef ref -> {
+                this.writeRef(ref);
+            }
         }
     }
 
@@ -135,6 +144,10 @@ public class TypescriptWriter implements AutoCloseable {
         this.writer.write(Double.toString(numberLiteral.value()));
     }
 
+    private void writeRef(TypescriptRef ref) throws IOException {
+        this.writeIdentifier(ref.name());
+    }
+
     // == Doc comments ==
 
     private void writeDocComment(DocComment docComment) throws IOException {
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptClassFieldDeclaration.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptClassFieldDeclaration.java
index 8fc386c..c327724 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptClassFieldDeclaration.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptClassFieldDeclaration.java
@@ -7,38 +7,52 @@ package org.zwobble.hobgoblin.compiler.output.lang.typescript.ast;
 
 public record TypescriptClassFieldDeclaration(
     org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier name,
+    java.util.Optional<org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression> type,
     java.util.Optional<org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression> initialValue
 ) implements org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassElement {
     public static org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder arbitrary() {
-        return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier.arbitrary().build(), java.util.Optional.empty());
+        return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier.arbitrary().build(), java.util.Optional.empty(), java.util.Optional.empty());
     }
 
     public record Builder(
         org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier name,
+        java.util.Optional<org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression> type,
         java.util.Optional<org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression> initialValue
     ) implements org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassElement.Builder {
         public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration build() {
-            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration(name, initialValue);
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration(name, type, initialValue);
         }
 
         public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder withName(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier name) {
-            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name, initialValue);
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name, type, initialValue);
         }
 
         public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder withName(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier.Builder name) {
-            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name.build(), initialValue);
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name.build(), type, initialValue);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder withType(java.util.Optional<org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression> type) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name, type, initialValue);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder withType(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression type) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name, java.util.Optional.of(type), initialValue);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder withType(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression.Builder type) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name, java.util.Optional.of(type.build()), initialValue);
         }
 
         public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder withInitialValue(java.util.Optional<org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression> initialValue) {
-            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name, initialValue);
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name, type, initialValue);
         }
 
         public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder withInitialValue(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression initialValue) {
-            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name, java.util.Optional.of(initialValue));
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name, type, java.util.Optional.of(initialValue));
         }
 
         public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder withInitialValue(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression.Builder initialValue) {
-            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name, java.util.Optional.of(initialValue.build()));
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder(name, type, java.util.Optional.of(initialValue.build()));
         }
 
         // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassFieldDeclaration.Builder body
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptExpression.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptExpression.java
index 4c04085..3996e2c 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptExpression.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptExpression.java
@@ -5,7 +5,7 @@ package org.zwobble.hobgoblin.compiler.output.lang.typescript.ast;
 // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression imports
 // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression imports
 
-public sealed interface TypescriptExpression permits org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptNumberLiteral {
+public sealed interface TypescriptExpression permits org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptNumberLiteral, org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef {
     public interface Builder {
         public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression build();
 
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptRef.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptRef.java
new file mode 100644
index 0000000..a2c087f
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptRef.java
@@ -0,0 +1,36 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.typescript.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef imports
+
+public record TypescriptRef(
+    org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier name
+) implements org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression {
+    public static org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef.Builder arbitrary() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef.Builder(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier.arbitrary().build());
+    }
+
+    public record Builder(
+        org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier name
+    ) implements org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression.Builder {
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef build() {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef(name);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef.Builder withName(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier name) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef.Builder(name);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef.Builder withName(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier.Builder name) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef.Builder(name.build());
+        }
+
+        // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef.Builder body
+        // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef.Builder body
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptRef body
+}
-- 
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