Add typeRoots to tsonfig of plugins template

As opposed to having them to add for each plugin individually.

Putting both typeRoots (IDE and Bazel) into one config does not seem
to do any harm, and it avoids having to write two tsonfig files for
each plugin.

Change-Id: Ifed8b2a481a724e07b3bf26d3d250409a94ab495
diff --git a/plugins/tsconfig-plugins-base.json b/plugins/tsconfig-plugins-base.json
index b580549..97eae67 100644
--- a/plugins/tsconfig-plugins-base.json
+++ b/plugins/tsconfig-plugins-base.json
@@ -34,6 +34,15 @@
     "incremental": true,
     "experimentalDecorators": true,
 
-    "allowUmdGlobalAccess": true
+    "allowUmdGlobalAccess": true,
+
+    "typeRoots": [
+      /* typeRoots for Bazel */
+      "../external/ui_dev_npm/node_modules/@types",
+      "../external/plugins_npm/node_modules/@types",
+      /* typeRoots for IDE */
+      "../polygerrit-ui/node_modules/@types",
+      "../plugins/node_modules/@types"
+    ]
   },
 }