diff --git a/config/benchmarks/computer-use/electron/package.json b/config/benchmarks/computer-use/electron/package.json
new file mode 100644
index 00000000000..5bbefffbabe
--- /dev/null
+++ b/config/benchmarks/computer-use/electron/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "commonjs"
+}
diff --git a/config/build-plugins/vitest-react-compiler.ts b/config/build-plugins/vitest-react-compiler.ts
index 1b3a180f43a..70ba42466b9 100644
--- a/config/build-plugins/vitest-react-compiler.ts
+++ b/config/build-plugins/vitest-react-compiler.ts
@@ -4,7 +4,7 @@ import {
   REACT_COMPILER_OPTIONS,
   isReactCompilerEnabled,
   reactCompilerExcludePattern
-} from './react-compiler'
+} from './react-compiler.ts'
 
 const rendererSource = /\/src\/renderer\/src\/.*\.tsx?$/
 // Only shipped code is compiled; tests, fixtures, mocks and harnesses run as written.
diff --git a/config/package.json b/config/package.json
new file mode 100644
index 00000000000..3dbc1ca591c
--- /dev/null
+++ b/config/package.json
@@ -0,0 +1,3 @@
+{
+  "type": "module"
+}
diff --git a/config/tsconfig.node.json b/config/tsconfig.node.json
index f9503dd05e3..d05c53f1742 100644
--- a/config/tsconfig.node.json
+++ b/config/tsconfig.node.json
@@ -42,6 +42,7 @@
   ],
   "compilerOptions": {
     "composite": true,
+    "rewriteRelativeImportExtensions": true,
     "types": ["electron-vite/node"]
   }
 }
diff --git a/config/vitest.config.ts b/config/vitest.config.ts
index ad1f0045a93..ed0495975f7 100644
--- a/config/vitest.config.ts
+++ b/config/vitest.config.ts
@@ -13,11 +13,11 @@ import { filesSafeToShareWorker } from './scripts/test-runtime/execution-policy/
 import { gitSigningOffEnv } from './scripts/test-runtime/environment/vitest-git-signing-env.mjs'
 import RuntimeSequencer from './scripts/test-runtime/execution-policy/vitest-runtime-sequencer.mjs'
 import { getNodeRuntimeInclude } from './scripts/test-runtime/sqlite-admission/vitest-node-runtime-files.mjs'
-import { nodeRuntimePool } from './scripts/test-runtime/node-worker/vitest-node-runtime-pool'
+import { nodeRuntimePool } from './scripts/test-runtime/node-worker/vitest-node-runtime-pool.ts'
 import { readRunFilters } from './scripts/test-runtime/execution-policy/vitest-run-filters.mjs'
 import { createWorkspaceSourceResolver } from './scripts/workspace/source-exports/workspace-source-exports.mjs'
-import { moduleCacheResolutionKey } from './scripts/test-runtime/module-cache/vitest-module-cache-resolution-key'
-import { vitestReactCompiler } from './build-plugins/vitest-react-compiler'
+import { moduleCacheResolutionKey } from './scripts/test-runtime/module-cache/vitest-module-cache-resolution-key.ts'
+import { vitestReactCompiler } from './build-plugins/vitest-react-compiler.ts'
 
 const nodeRuntimeInclude = process.versions.bun
   ? getNodeRuntimeInclude({ filters: readRunFilters() })
diff --git a/config/vitest.performance.config.ts b/config/vitest.performance.config.ts
index 37d4f7a4763..2d2802ced67 100644
--- a/config/vitest.performance.config.ts
+++ b/config/vitest.performance.config.ts
@@ -1,8 +1,8 @@
 import { existsSync } from 'node:fs'
 import { resolve } from 'node:path'
 import { defineConfig } from 'vitest/config'
-import baseConfig from './vitest.config'
-import { nodeRuntimePool } from './scripts/test-runtime/node-worker/vitest-node-runtime-pool'
+import baseConfig from './vitest.config.ts'
+import { nodeRuntimePool } from './scripts/test-runtime/node-worker/vitest-node-runtime-pool.ts'
 
 const contracts = [
   'src/main/runtime/session-tabs/session-tabs-phone-layout-moves.test.ts',