Add strict types

cli.js

@@ -4,7 +4,7 @@ import fs from 'node:fs'
 import process from 'node:process'
 import {lancasterStemmer} 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)))
 )

index.js

@@ -11,6 +11,7 @@ const vowels = /[aeiouy]/
  * @property {number} type
  */
 
+/** @type {Record<string, Array<RuleSet>>} */
 const rules = {
   a: [
     {match: 'ia', replacement: '', type: intact},
@@ -184,7 +185,7 @@ export function lancasterStemmer(value) {
  * @returns {string}
  */
 function applyRules(value, isIntact) {
-  /** @type {Array.<RuleSet>} */
+  /** @type {Array<RuleSet>} */
   const ruleset = rules[value.charAt(value.length - 1)]
   let index = -1
 

test.js

@@ -1,11 +1,12 @@
+import assert from 'node:assert/strict'
 import {exec} from 'node:child_process'
 import fs from 'node:fs'
 import {URL} from 'node:url'
 import {PassThrough} from 'node:stream'
 import test from 'tape'
 import {lancasterStemmer as m} 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)))
 )
@@ -277,6 +278,7 @@ test('cli', function (t) {
     t.deepEqual([error, stdout, stderr], [null, 'detest vil\n', ''], 'stdin')
   })
 
+  assert(subprocess.stdin, 'expected `stdin` on child process')
   input.pipe(subprocess.stdin)
   input.write('detestable')
   setImmediate(function () {

tsconfig.json

@@ -1,15 +1,17 @@
 {
-  "include": ["*.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"
   }
 }