Fix typescript-checkJS script

lib/suggestSimilar.js

@@ -1,3 +1,5 @@
+// @ts-check
+
 const maxDistance = 3;
 
 function editDistance(a, b) {

package.json

@@ -25,7 +25,7 @@
     "test": "jest && npm run test-typings",
     "test-esm": "node ./tests/esm-imports-test.mjs",
     "test-typings": "tsd",
-    "typescript-checkJS": "tsc --allowJS --checkJS index.js lib/*.js --noEmit",
+    "typescript-checkJS": "tsc -p tsconfig.checkJs.json",
     "test-all": "npm run test && npm run lint && npm run typescript-checkJS && npm run test-esm"
   },
   "files": [

tsconfig.checkJs.json

@@ -0,0 +1,14 @@
+{
+  "extends": "./tsconfig",
+  "compilerOptions": {
+    "allowJs": true,
+    "checkJs": true,
+    "noImplicitAny": false,
+    "noImplicitThis": false
+  },
+  "include": [
+    "**/*.ts",
+    "index.js",
+    "lib/**/*.js"
+  ]
+}

tsconfig.json

@@ -1,18 +1,20 @@
 {
-    "compilerOptions": {
-        "module": "commonjs",
-        "lib": [
-            "es6"
-        ],
-        "noImplicitAny": true,
-        "noImplicitThis": true,
-        "strictNullChecks": true,
-        "types": [
-          "node",
-          "jest"
-        ],
-        "noEmit": true,
-        "forceConsistentCasingInFileNames": true
-    },
-    "include": ["**/*.ts"],
+  "compilerOptions": {
+    "module": "commonjs",
+    "lib": [
+      "es6"
+    ],
+    "noImplicitAny": true,
+    "noImplicitThis": true,
+    "strictNullChecks": true,
+    "types": [
+      "node",
+      "jest"
+    ],
+    "noEmit": true,
+    "forceConsistentCasingInFileNames": true
+  },
+  "include": [
+    "**/*.ts"
+  ]
 }