fix(init): 'cdk init' doesn't leave .d.ts files (#4841)

* fix(init): 'cdk init' doesn't leave .d.ts files

`cdk init` was leaving `add-project.hook.d.ts` in the .NET project
directory, since that file was not matching the regex intended to
catch those files.

Fix that, and add a test to make sure.

* Update init.ts

packages/aws-cdk/lib/init.ts

@@ -116,7 +116,7 @@ export class InitTemplate {
       } else if (file.match(/^.*\.template\.[^.]+$/)) {
         await this.installProcessed(fromFile, toFile.replace(/\.template(\.[^.]+)$/, '$1'), project);
         continue;
-      } else if (file.match(/^.*\.hook\.[^.]+$/)) {
+      } else if (file.match(/^.*\.hook\.(d.)?[^.]+$/)) {
         await this.installProcessed(fromFile, path.join(targetDirectory, "tmp", file), project);
         continue;
       } else {

packages/aws-cdk/test/integ/init/common.bash

@@ -17,3 +17,9 @@ function header() {
   log $@
   log "============================================================================================"
 }
+
+function assert_no_hook_files() {
+  compgen "\*.hook.\*" || return 0
+  echo "'cdk init' left hook files in the template directory!" >&2
+  exit 1
+}

packages/aws-cdk/tsconfig.json

@@ -18,14 +18,11 @@
       },
     "include": [
         "**/*.ts",
-        "**/*.d.ts"
+        "**/*.d.ts",
+        "lib/init-templates/*/*/add-project.hook.ts"
     ],
     "exclude": [
-        "lib/init-templates/**/*"
-    ],
-    "files": [
-        "lib/init-templates/app/csharp/add-project.hook.ts",
-        "lib/init-templates/app/fsharp/add-project.hook.ts"
+        "lib/init-templates/*/typescript/**/*.ts"
     ]
 }