From 30c7a202bbc3928cbc321974e417ef902e719692 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Mon, 31 Aug 2026 22:56:01 +0100
Subject: Add type alias to TypeScript AST

---
 .../output/lang/typescript/TypescriptWriter.java   | 12 ++++++
 .../lang/typescript/ast/TypescriptStatement.java   |  2 +-
 .../lang/typescript/ast/TypescriptTypeAlias.java   | 46 ++++++++++++++++++++++
 3 files changed, 59 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptTypeAlias.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 93216bf..50d67bf 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
@@ -79,6 +79,10 @@ public class TypescriptWriter implements AutoCloseable {
             case TypescriptExpressionStatement expressionStatement -> {
                 this.writeExpressionStatement(expressionStatement);
             }
+
+            case TypescriptTypeAlias typeAlias -> {
+                this.writeTypeAlias(typeAlias);
+            }
         }
     }
 
@@ -136,6 +140,14 @@ public class TypescriptWriter implements AutoCloseable {
         this.writer.write(";");
     }
 
+    private void writeTypeAlias(TypescriptTypeAlias typeAlias) throws IOException {
+        this.writer.write("type ");
+        this.writeIdentifier(typeAlias.name());
+        this.writer.write(" = ");
+        this.writeExpression(typeAlias.type());
+        this.writer.write(";");
+    }
+
     // == Class elements ==
 
     void writeClassElement(TypescriptClassElement element) throws IOException {
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptStatement.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptStatement.java
index 6d24493..5d687c0 100644
--- a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptStatement.java
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptStatement.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.TypescriptStatement imports
 // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptStatement imports
 
-public sealed interface TypescriptStatement permits org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassDeclaration, org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExportNamesStatement, org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpressionStatement {
+public sealed interface TypescriptStatement permits org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptClassDeclaration, org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExportNamesStatement, org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpressionStatement, org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias {
     public interface Builder {
         public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptStatement build();
 
diff --git a/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptTypeAlias.java b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptTypeAlias.java
new file mode 100644
index 0000000..0031a83
--- /dev/null
+++ b/src/main/java/org/zwobble/hobgoblin/compiler/output/lang/typescript/ast/TypescriptTypeAlias.java
@@ -0,0 +1,46 @@
+// Generated by hobgoblin.
+
+package org.zwobble.hobgoblin.compiler.output.lang.typescript.ast;
+
+// Custom area start: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias imports
+// Custom area end: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias imports
+
+public record TypescriptTypeAlias(
+    org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier name,
+    org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression type
+) implements org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptStatement {
+    public static org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder arbitrary() {
+        return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier.arbitrary().build(), org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptNumberLiteral.arbitrary().build());
+    }
+
+    public record Builder(
+        org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier name,
+        org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression type
+    ) implements org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptStatement.Builder {
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias build() {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias(name, type);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder withName(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier name) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder(name, type);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder withName(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptIdentifier.Builder name) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder(name.build(), type);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder withType(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression type) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder(name, type);
+        }
+
+        public org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder withType(org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptExpression.Builder type) {
+            return new org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder(name, type.build());
+        }
+
+        // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder body
+        // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias.Builder body
+    }
+
+    // Custom area start: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias body
+    // Custom area end: org.zwobble.hobgoblin.compiler.output.lang.typescript.ast.TypescriptTypeAlias body
+}
-- 
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