diff --git a/index.js b/index.js
index 2e6b430..650ffbe 100644
--- a/index.js
+++ b/index.js
@@ -1,12 +1,12 @@
-import {trigram} from 'n-gram'
-import {collapseWhiteSpace} from 'collapse-white-space'
-
 /**
  * @typedef {[string, number]} TrigramTuple
  * @typedef {TrigramTuple[]} TrigramTuples
- * @typedef {Object.<string, number>} TrigramDictionary
+ * @typedef {Record<string, number>} TrigramDictionary
  */
 
+import {trigram} from 'n-gram'
+import {collapseWhiteSpace} from 'collapse-white-space'
+
 const own = {}.hasOwnProperty
 
 /**
@@ -14,7 +14,7 @@ const own = {}.hasOwnProperty
  * Removed general non-important (as in, for language detection) punctuation
  * marks, symbols, and digits.
  *
- * @param {string} [value]
+ * @param {string|null} [value]
  * @returns {string}
  */
 export function clean(value) {
diff --git a/package.json b/package.json
index c639cb7..88c35ad 100644
--- a/package.json
+++ b/package.json
@@ -44,11 +44,11 @@
     "xo": "^0.46.0"
   },
   "scripts": {
-    "prepack": "npm run build && npm run format",
+    "prepublishOnly": "npm run build && npm run format",
     "build": "rimraf \"*.d.ts\" && tsc && type-coverage",
     "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
-    "test-api": "node test.js",
-    "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov node test.js",
+    "test-api": "node --conditions development test.js",
+    "test-coverage": "c8 --check-coverage --branches 100 --functions 100 --lines 100 --statements 100 --reporter lcov npm run test-api",
     "test": "npm run build && npm run format && npm run test-coverage"
   },
   "prettier": {
@@ -70,6 +70,7 @@
   "typeCoverage": {
     "atLeast": 100,
     "detail": true,
-    "strict": true
+    "strict": true,
+    "ignoreCatch": true
   }
 }
diff --git a/tsconfig.json b/tsconfig.json
index 8ac10fe..e31adf8 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,5 +1,4 @@
 {
-  "files": ["index.js"],
   "include": ["*.js"],
   "compilerOptions": {
     "target": "ES2020",
@@ -11,6 +10,7 @@
     "declaration": true,
     "emitDeclarationOnly": true,
     "allowSyntheticDefaultImports": true,
-    "skipLibCheck": true
+    "skipLibCheck": true,
+    "strict": true
   }
 }