handle export type

Author: Rich-Harris

src/languages/ts.js

@@ -747,11 +747,13 @@ export default (options = {}) => {
 		},
 
 		ExportAllDeclaration(node, context) {
-			context.write('export * ');
+			context.write(node.exportKind === 'type' ? 'export type * ' : 'export * ');
+
 			if (node.exported) {
 				context.write('as ');
 				context.visit(node.exported);
 			}
+
 			context.write(' from ');
 			context.visit(node.source);
 			context.write(';');
@@ -770,6 +772,10 @@ export default (options = {}) => {
 		ExportNamedDeclaration(node, context) {
 			context.write('export ');
 
+			if (node.exportKind === 'type') {
+				context.write('type ');
+			}
+
 			if (node.declaration) {
 				context.visit(node.declaration);
 				return;
@@ -788,6 +794,10 @@ export default (options = {}) => {
 		},
 
 		ExportSpecifier(node, context) {
+			if (node.exportKind === 'type') {
+				context.write('type ');
+			}
+
 			context.visit(node.local);
 
 			if (node.local.name !== node.exported.name) {

test/samples/ts-export/expected.ts

@@ -0,0 +1,9 @@
+// TODO i think these are currently broken in acorn-typescript?
+// export type X = number;
+// export type * from './elsewhere';
+type Y = number;
+
+type Z = number;
+
+export type { Y };
+export { type Z };

test/samples/ts-export/expected.ts.map

@@ -0,0 +1,11 @@
+{
+  "version": 3,
+  "names": [],
+  "sources": [
+    "input.js"
+  ],
+  "sourcesContent": [
+    "// TODO i think these are currently broken in acorn-typescript?\n// export type X = number;\n// export type * from './elsewhere';\n\ntype Y = number;\ntype Z = number;\nexport type { Y };\nexport { type Z };\n"
+  ],
+  "mappings": ";;;KAIK,CAAC,GAAG,MAAM;;KACV,CAAC,GAAG,MAAM;;cACD,CAAC;cACD,CAAC"
+}

test/samples/ts-export/input.ts

@@ -0,0 +1,8 @@
+// TODO i think these are currently broken in acorn-typescript?
+// export type X = number;
+// export type * from './elsewhere';
+
+type Y = number;
+type Z = number;
+export type { Y };
+export { type Z };