pkg: add type lints using tsc.

lib/base32.js

@@ -227,7 +227,7 @@ function _decode(str, table, unpad) {
   if (left > 0)
     throw new Error('Invalid base32 string.');
 
-  if (str.length !== i + (-mode & 7) * unpad)
+  if (str.length !== i + (-mode & 7) * Number(unpad))
     throw new Error('Invalid base32 string.');
 
   for (; i < str.length; i++) {
@@ -244,7 +244,7 @@ function _decode(str, table, unpad) {
  * Test a base32 string.
  * @param {String} str
  * @param {Boolean} [unpad=false]
- * @returns {Buffer}
+ * @returns {Boolean}
  */
 
 function test(str, unpad = false) {
@@ -260,7 +260,7 @@ function test(str, unpad = false) {
  * Test a base32 hex string.
  * @param {String} str
  * @param {Boolean} [unpad=false]
- * @returns {Buffer}
+ * @returns {Boolean}
  */
 
 function testHex(str, unpad = false) {

lib/bs32.js

@@ -1,3 +1,5 @@
 'use strict';
 
-module.exports = require('./base32');
+const base32 = require('./base32');
+
+module.exports = base32;

package.json

@@ -15,13 +15,15 @@
   "main": "./lib/bs32.js",
   "scripts": {
     "lint": "eslint lib/ test/",
+    "lint-types": "tsc -p .",
     "test": "bmocha --reporter spec test/*-test.js"
   },
   "dependencies": {
     "bsert": "~0.0.10"
   },
   "devDependencies": {
-    "bmocha": "^2.1.0"
+    "bmocha": "^2.1.0",
+    "bts-type-deps": "^0.0.3"
   },
   "engines": {
     "node": ">=8.0.0"

tsconfig.json

@@ -0,0 +1,31 @@
+{
+  "include": [
+    "lib/**/*.js"
+  ],
+  "compilerOptions": {
+    "rootDir": ".",
+    "target": "ES2020",
+    "lib": [
+      "ES2020"
+    ],
+
+    "noEmit": true,
+
+    "allowJs": true,
+    "checkJs": true,
+    "maxNodeModuleJsDepth": 10,
+
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "resolveJsonModule": true,
+
+    "stripInternal": true,
+    "noImplicitThis": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": false,
+
+    "typeRoots": [
+      "node_modules/bts-type-deps/types"
+    ]
+  }
+}