chore: adding TS configs and converting all JS to TS files (#8)

jest.config.js

@@ -0,0 +1,5 @@
+/** @type {import('ts-jest/dist/types').InitialOptionsTsJest} */
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};

package.json

@@ -1,25 +1,33 @@
 {
   "name": "plain-object",
-  "version": "1.3.0",
+  "version": "1.4.0",
   "description": "Convert nested JSON to simple plain JSON object",
   "license": "MIT",
   "author": "Ademílson F. Tonato <[email protected]>",
   "repository": {
     "type": "git",
     "url": "git://github.com/ftonato/plain-object.git"
   },
-  "main": "main.js",
+  "main": "dist/main.js",
   "scripts": {
-    "build": "rollup -c",
-    "test": "jest"
+    "build": "rollup -c rollup.config.js",
+    "test": "jest --no-cache"
+  },
+  "engines": {
+    "node": ">=12"
   },
   "dependencies": {
     "@sindresorhus/is": "^4.6.0"
   },
   "devDependencies": {
+    "@rollup/plugin-typescript": "^8.3.1",
+    "@types/jest": "^27.4.1",
     "jest": "^27.5.1",
     "rollup": "^2.69.0",
-    "rollup-plugin-terser": "^7.0.2"
+    "rollup-plugin-terser": "^7.0.2",
+    "ts-jest": "^27.1.3",
+    "tslib": "^2.3.1",
+    "typescript": "^4.6.2"
   },
   "keywords": [
     "object",

rollup.config.js

@@ -1,14 +1,11 @@
 import { terser } from "rollup-plugin-terser";
+import typescript from "@rollup/plugin-typescript";
 
-export default [
-  {
-    input: "index.js",
-    output: [
-      {
-        file: "main.js",
-        format: "esm",
-        plugins: [terser()],
-      },
-    ],
+export default {
+  input: "src/index.ts",
+  output: {
+    format: "esm",
+    file: "dist/main.js",
   },
-];
+  plugins: [typescript({ tsconfig: "tsconfig.json" }), terser()],
+};

test.js → src/index.test.ts

@@ -1,12 +1,13 @@
-const plainObject = require("./index.js");
-const {
+const plainObject = require("./index.ts");
+
+import {
   MOCK,
   MOCK_DATE,
   MOCK_BIGINT,
   MOCK_BUFFER,
   MOCK_REGEXP,
   MOCK_PROMISE,
-} = require("./mock.js");
+} from "./mock";
 
 describe("[plain-object pkg] plainObject method", () => {
   it("plain object using [string]", () => {

index.js → src/index.ts

@@ -1,16 +1,20 @@
 const is = require("@sindresorhus/is");
 
-function isValidNumber(value) {
-  return is.number(value) && !isNaN(value);
+interface GenericObject {
+  [key: string]: any;
 }
 
-function isValidObject(value) {
+function isValidNumber(value: GenericObject): boolean {
+  return is.number(value) && !isNaN(+value);
+}
+
+function isValidObject(value: GenericObject): boolean {
   return is.object(value) && !is.null(value);
 }
 
-function plainObject(obj, response = {}) {
-  for (let key in obj) {
-    const value = obj[key];
+function plainObject(data: any, response: GenericObject = {}): GenericObject {
+  for (let key in data) {
+    const value = data[key];
     const type = typeof value;
 
     if (

mock.js → src/mock.ts

@@ -48,11 +48,4 @@ const MOCK = {
   },
 };
 
-module.exports = {
-  MOCK,
-  MOCK_DATE,
-  MOCK_BIGINT,
-  MOCK_BUFFER,
-  MOCK_REGEXP,
-  MOCK_PROMISE,
-};
+export { MOCK, MOCK_DATE, MOCK_BIGINT, MOCK_BUFFER, MOCK_REGEXP, MOCK_PROMISE };

tsconfig.json

@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "rootDir": "src",
+    "moduleResolution": "node",
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "noImplicitAny": false
+  }
+}