Escape multi-line comment close tag in docs (#77)

Author: Chase Coalwell

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/TypeScriptWriter.java

@@ -189,7 +189,8 @@ TypeScriptWriter writeDocs(Runnable runnable) {
      */
     public TypeScriptWriter writeDocs(String docs) {
         // Docs can have valid $ characters that shouldn't run through formatters.
-        writeDocs(() -> write(docs.replace("$", "$$")));
+        // Escapes multi-line comment closings.
+        writeDocs(() -> write(docs.replace("$", "$$").replace("*/", "*\\/")));
         return this;
     }
 

smithy-typescript-codegen/src/test/java/software/amazon/smithy/typescript/codegen/TypeScriptWriterTest.java

@@ -36,6 +36,17 @@ public void escapesDollarInDocStrings() {
         assertThat(result, equalTo("/**\n * " + docs + "\n */\n"));
     }
 
+    @Test
+    public void escapesMultiLineCloseInDocStrings() {
+        String docs = "This is */ valid documentation.";
+
+        TypeScriptWriter writer = new TypeScriptWriter("foo");
+        writer.writeDocs(docs);
+        String result = writer.toString();
+
+        assertThat(result, equalTo("/**\n * This is *\\/ valid documentation.\n */\n"));
+    }
+
     @Test
     public void addsFormatterForSymbols() {
         // TODO