diff --git a/cli.js b/cli.js
index e08690e..2b699b6 100755
--- a/cli.js
+++ b/cli.js
@@ -4,7 +4,7 @@ import process from 'node:process'
 import {URL} from 'node:url'
 import {syllable} from './index.js'
 
-/** @type {Object.<string, unknown>} */
+/** @type {Record<string, unknown>} */
 const pack = JSON.parse(
   String(fs.readFileSync(new URL('package.json', import.meta.url)))
 )
@@ -43,7 +43,7 @@ function getSyllables(value) {
 }
 
 /**
- * @param {Array.<string>} values
+ * @param {Array<string>} values
  */
 function syllables(values) {
   let sum = 0
diff --git a/problematic.js b/problematic.js
index d5b0c84..81baf1e 100644
--- a/problematic.js
+++ b/problematic.js
@@ -1,3 +1,4 @@
+/** @type {Record<string, number>} */
 export const problematic = {
   abalone: 4,
   abare: 3,
diff --git a/test/index.js b/test/index.js
index 55a7b2d..63e0f07 100644
--- a/test/index.js
+++ b/test/index.js
@@ -1,3 +1,4 @@
+import assert from 'node:assert/strict'
 import {exec} from 'node:child_process'
 import fs from 'node:fs'
 import {URL} from 'node:url'
@@ -7,12 +8,12 @@ import {syllable} from '../index.js'
 
 const own = {}.hasOwnProperty
 
-/** @type {Object.<string, unknown>} */
+/** @type {Record<string, unknown>} */
 const pack = JSON.parse(
   String(fs.readFileSync(new URL('../package.json', import.meta.url)))
 )
 
-/** @type {Object.<string, number>} */
+/** @type {Record<string, number>} */
 const fixtures = JSON.parse(
   String(fs.readFileSync(new URL('fixture.json', import.meta.url)))
 )
@@ -273,6 +274,7 @@ test('cli', function (t) {
     t.deepEqual([error, stdout, stderr], [null, '6\n', ''], 'stdin')
   })
 
+  assert(subprocess.stdin, 'expected `stdin` on child process')
   input.pipe(subprocess.stdin)
   input.write('syllab')
   setImmediate(function () {
diff --git a/tsconfig.json b/tsconfig.json
index 1cb61bf..016d1f4 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,15 +1,17 @@
 {
-  "include": ["*.js", "test/**/*.js"],
+  "include": ["**/**.js"],
+  "exclude": ["coverage", "node_modules"],
   "compilerOptions": {
-    "target": "ES2020",
-    "lib": ["ES2020"],
-    "module": "ES2020",
-    "moduleResolution": "node",
-    "allowJs": true,
     "checkJs": true,
     "declaration": true,
     "emitDeclarationOnly": true,
-    "allowSyntheticDefaultImports": true,
-    "skipLibCheck": true
+    "exactOptionalPropertyTypes": true,
+    "forceConsistentCasingInFileNames": true,
+    "lib": ["es2020"],
+    "module": "node16",
+    "newLine": "lf",
+    "skipLibCheck": true,
+    "strict": true,
+    "target": "es2020"
   }
 }