fix(libs): make the type-tests targets runnable again

All three failed on main for two inherited reasons: TS 6 errors on the
baseUrl deprecation from tsconfig.base.json, and the per-library rootDir
excludes the sibling sources that type-specs import through path mappings.
Both are scoped to the type-tests configs — putting ignoreDeprecations in
tsconfig.base.json breaks the library builds, whose compiler rejects the
option with TS5103.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: blove

libs/ag-ui/tsconfig.type-tests.json

@@ -2,6 +2,12 @@
   "extends": "./tsconfig.lib.json",
   "compilerOptions": {
     "noEmit": true,
+    // This target runs the workspace `tsc` (newer than the build compilers),
+    // which errors on the inherited baseUrl unless deprecations are ignored.
+    "ignoreDeprecations": "6.0",
+    // Type-specs import sibling libraries through tsconfig paths; with noEmit
+    // the rootDir only has to be wide enough to contain them.
+    "rootDir": "../..",
     "strict": true,
     "strictFunctionTypes": true,
     "skipLibCheck": true,

libs/chat/tsconfig.type-tests.json

@@ -3,6 +3,12 @@
   "compilerOptions": {
     "outDir": "../../dist/out-tsc/type-tests",
     "noEmit": true,
+    // This target runs the workspace `tsc` (newer than the build compilers),
+    // which errors on the inherited baseUrl unless deprecations are ignored.
+    "ignoreDeprecations": "6.0",
+    // Type-specs import sibling libraries through tsconfig paths; with noEmit
+    // the rootDir only has to be wide enough to contain them.
+    "rootDir": "../..",
     "composite": false,
     "declarationMap": false,
     "emitDeclarationOnly": false,

libs/langgraph/tsconfig.type-tests.json

@@ -2,6 +2,12 @@
   "extends": "./tsconfig.lib.json",
   "compilerOptions": {
     "noEmit": true,
+    // This target runs the workspace `tsc` (newer than the build compilers),
+    // which errors on the inherited baseUrl unless deprecations are ignored.
+    "ignoreDeprecations": "6.0",
+    // Type-specs import sibling libraries through tsconfig paths; with noEmit
+    // the rootDir only has to be wide enough to contain them.
+    "rootDir": "../..",
     "strict": true,
     "strictFunctionTypes": true,
     "skipLibCheck": true,