Use typescript

.gitignore

@@ -1,3 +1,8 @@
 node_modules
 Thumbs.db
-.DS_Store
+.DS_Store
+index.js
+index.d.ts
+.idea
+yarn.lock
+package-lock.json

.travis.yml

@@ -1,5 +1,3 @@
 language: node_js
 node_js:
-  - 4.4.7
-  - 5
-  - 6
+  - 10

index.ts

@@ -0,0 +1,13 @@
+/**
+ * Stringify object values
+ * { hello: 'world' } -> { hello: "'world'" }
+ *
+ * @param {object} object
+ * @return {object}
+ */
+export = (function stringify(object: { [x: string]: any; }) {
+    return Object.keys(object)
+        .reduce(function (previous: any, next: any) {
+        return (previous[next] = JSON.stringify(object[next]), previous);
+    }, {}) as {[x: string]: string};
+});

package.json

@@ -4,7 +4,9 @@
   "description": "Stringify object values",
   "main": "index.js",
   "scripts": {
-    "test": "mocha test.js"
+    "build": "tsc",
+    "prepublish": "tsc",
+    "test": "env TS_NODE_COMPILER_OPTIONS='{\"module\": \"commonjs\" }' mocha -r ts-node/register 'test.ts'"
   },
   "repository": {
     "type": "git",
@@ -19,7 +21,12 @@
   "author": "Kier Borromeo <seraphipod@gmail.com> (http://srph.github.io)",
   "license": "ISC",
   "devDependencies": {
-    "chai": "^3.5.0",
-    "mocha": "^3.0.2"
-  }
+    "@types/chai": "^4.2.12",
+    "@types/mocha": "^8.0.0",
+    "chai": "^4.2.0",
+    "mocha": "^8.0.1",
+    "ts-node": "^8.10.2",
+    "typescript": "^3.9.7"
+  },
+  "files": ["index.js", "index.d.ts"]
 }

test.ts

@@ -0,0 +1,21 @@
+import * as chai from "chai";
+import stringify from "./";
+var expect = chai.expect;
+describe('stringify', function () {
+    it('should stringify each of the object\'s value', function () {
+        var test = {
+            hello: 'world',
+            favorite: 1,
+            equation: '1+1',
+            random: {},
+            arr: []
+        };
+        expect(stringify(test)).to.eql({
+            hello: JSON.stringify('world'),
+            favorite: JSON.stringify(1),
+            equation: JSON.stringify('1+1'),
+            random: JSON.stringify({}),
+            arr: JSON.stringify([])
+        });
+    });
+});

tsconfig.json

@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "module": "CommonJS",
+    "moduleResolution": "node",
+    "esModuleInterop": true,
+    "strict": true,
+    "skipLibCheck": true,
+    "experimentalDecorators": true,
+    "emitDecoratorMetadata": true,
+    "noUnusedLocals": true,
+    "pretty": true,
+    "declaration": true,
+    "lib": [
+      "esnext"
+    ],
+  },
+  "files": [
+    "index.ts"
+  ]
+}