add blank typeRoots bug fix, #418 phetsims/chipper#1483

tsconfig/tsconfig-core.json

@@ -43,7 +43,9 @@
     // "baseUrl": "./",                             /* Specify the base directory to resolve non-relative module names. */
     // "paths": {},                                 /* Specify a set of entries that re-map imports to additional lookup locations. */
     // "rootDirs": [],                              /* Allow multiple folders to be treated as one when resolving modules. */
-    // "typeRoots": [],                             /* Specify multiple folders that act like './node_modules/@types'. */
+
+    // Override the default behavior (not providing a value) that discovers all types from node_modules/@types.
+     "typeRoots": [],                             /* Specify multiple folders that act like './node_modules/@types'. */
     // "types": [],                                 /* Specify type package names to be included without being referenced in a source file. */
     // "allowUmdGlobalAccess": true,                /* Allow accessing UMD globals from modules. */
     // "moduleSuffixes": [],                             /* List of file name suffixes to search when resolving a module. */