diff --git a/libs/ag-ui/project.json b/libs/ag-ui/project.json
index 9d93dae89..b7ee02082 100644
--- a/libs/ag-ui/project.json
+++ b/libs/ag-ui/project.json
@@ -57,7 +57,7 @@
     "type-tests": {
       "executor": "nx:run-commands",
       "options": {
-        "command": "npx tsc --noEmit -p libs/ag-ui/tsconfig.type-tests.json"
+        "command": "node ./node_modules/typescript/bin/tsc --noEmit -p libs/ag-ui/tsconfig.type-tests.json"
       }
     },
     "prepare-install": {
diff --git a/libs/ag-ui/tsconfig.type-tests.json b/libs/ag-ui/tsconfig.type-tests.json
index 1bdf4776a..119d3d12d 100644
--- a/libs/ag-ui/tsconfig.type-tests.json
+++ b/libs/ag-ui/tsconfig.type-tests.json
@@ -2,9 +2,6 @@
   "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": "../..",
diff --git a/libs/chat/project.json b/libs/chat/project.json
index d1c2540f8..4ccad4514 100644
--- a/libs/chat/project.json
+++ b/libs/chat/project.json
@@ -57,7 +57,7 @@
     "type-tests": {
       "executor": "nx:run-commands",
       "options": {
-        "command": "npx tsc --project libs/chat/tsconfig.type-tests.json --noEmit"
+        "command": "node ./node_modules/typescript/bin/tsc --project libs/chat/tsconfig.type-tests.json --noEmit"
       }
     },
     "prepare-install": {
diff --git a/libs/chat/tsconfig.type-tests.json b/libs/chat/tsconfig.type-tests.json
index 49ad5fe1d..24175b726 100644
--- a/libs/chat/tsconfig.type-tests.json
+++ b/libs/chat/tsconfig.type-tests.json
@@ -3,9 +3,6 @@
   "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": "../..",
diff --git a/libs/langgraph/project.json b/libs/langgraph/project.json
index 001a826b3..8f1b57655 100644
--- a/libs/langgraph/project.json
+++ b/libs/langgraph/project.json
@@ -57,7 +57,7 @@
     "type-tests": {
       "executor": "nx:run-commands",
       "options": {
-        "command": "npx tsc --noEmit -p libs/langgraph/tsconfig.type-tests.json"
+        "command": "node ./node_modules/typescript/bin/tsc --noEmit -p libs/langgraph/tsconfig.type-tests.json"
       }
     },
     "prepare-install": {
diff --git a/libs/langgraph/tsconfig.type-tests.json b/libs/langgraph/tsconfig.type-tests.json
index 1bdf4776a..119d3d12d 100644
--- a/libs/langgraph/tsconfig.type-tests.json
+++ b/libs/langgraph/tsconfig.type-tests.json
@@ -2,9 +2,6 @@
   "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": "../..",
diff --git a/tsconfig.base.json b/tsconfig.base.json
index 3a00a4735..bd1425983 100644
--- a/tsconfig.base.json
+++ b/tsconfig.base.json
@@ -15,6 +15,15 @@
     "noImplicitOverride": true,
     "noImplicitReturns": true,
     "noUnusedLocals": true,
+    // TypeScript 7 drops `baseUrl`, and since TypeScript 5.0 the `paths` below
+    // no longer need it (they resolve against this file's directory). It cannot
+    // go yet: Nx's buildable-library executors (`@nx/angular:package`,
+    // `@nx/js:tsc`) write a generated tsconfig under `tmp/<projectRoot>/build/`
+    // that re-declares `paths` with workspace-root-relative dist outputs such as
+    // `dist/libs/telemetry/browser`. Those entries are non-relative, so without a
+    // `baseUrl` TypeScript reports TS5090 and discards the whole `paths` map,
+    // and every library that depends on another library fails to compile.
+    // Removing this needs an Nx fix (or the Nx TS-solution setup) first.
     "baseUrl": ".",
     "paths": {
       "@threadplane/design-tokens": ["libs/design-tokens/src/index.ts"],