Before this PR, tsc compiled the now-deleted .doc.ts files (e.g.

  src/surfaces/checkout/components/Abbreviation/Abbreviation.doc.ts), which incidentally created
  build/ts/surfaces/checkout/components/ as a side effect. copyComponentDefinitions in buildTargetDts.ts
  assumed that directory existed. With the .doc.ts files gone, tsc no longer creates the parent dir, so
  copyFileSync fails with ENOENT on the destination.

Author: laurelthorburn

packages/ui-extensions/buildTargetDts.ts

@@ -28,6 +28,7 @@ function copyComponentDefinitions({
   if (!existsSync(buildPath)) {
     mkdirSync(buildPath, {recursive: true});
   }
+  mkdirSync(componentsBuildPath, {recursive: true});
 
   const exists = componentsSrcPaths.every((path) => existsSync(path));