Ugh.

DanielRosenwasser · web-flow · commit 312ce16e0f7f · 2021-04-23T01:39:55.000Z
diff --git a/src/compiler/sourcemap.ts b/src/compiler/sourcemap.ts
@@ -271,7 +271,7 @@ namespace ts {
                 sourceRoot,
                 sources,
                 names,
-                mappings: mappings.join(),
+                mappings: mappings.join(""),
                 sourcesContent,
             };
         }
