feat: added type checks and handled null type values

CHANGELOG.md

@@ -3,6 +3,13 @@
 All notable changes to this project will be documented in this file.
 See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
 
+### [3.0.2](https://github.com/codeskills-dev/md-to-react-email/compare/v3.0.1...v3.0.2) (2023-07-04)
+
+### Features
+
+- Added checks to handle `undefined | null | ''`
+- Added checks to handle input that is not of type `string`
+
 ### [3.0.1](https://github.com/codeskills-dev/md-to-react-email/compare/v3.0.0...v3.0.1) (2023-07-04)
 
 ### Features

__tests__/parseMarkdownToReactEmailJSX.test.ts

@@ -5,6 +5,36 @@ import {
 } from "../src";
 
 describe("Markdown to React Mail JSX Parser", () => {
+  it("handles empty string correctly", () => {
+    const markdown = "";
+    const expected = ``;
+
+    const rendered = parseMarkdownToReactEmailJSX({
+      markdown,
+    });
+    expect(rendered).toBe(expected);
+  });
+
+  it("handles undefined string correctly", () => {
+    const markdown = undefined as unknown as string;
+    const expected = ``;
+
+    const rendered = parseMarkdownToReactEmailJSX({
+      markdown,
+    });
+    expect(rendered).toBe(expected);
+  });
+
+  it("handles null string correctly", () => {
+    const markdown = null as unknown as string;
+    const expected = ``;
+
+    const rendered = parseMarkdownToReactEmailJSX({
+      markdown,
+    });
+    expect(rendered).toBe(expected);
+  });
+
   it("converts header one correctly", () => {
     const markdown = "# Hello, World!";
     const expected = `<h1 style="${parseCssInJsToInlineCss(

package.json

@@ -1,6 +1,6 @@
 {
   "name": "md-to-react-email",
-  "version": "3.0.1",
+  "version": "3.0.2",
   "description": "A simple Markdown parser for React-email written in typescript.",
   "keywords": [
     "markdown",

src/utils.ts

@@ -207,6 +207,15 @@ export function parseMarkdownToReactEmailJSX({
   customStyles,
   withDataAttr = false,
 }: ParseMarkdownToReactEmailJSXProps): string {
+  if (
+    markdown === undefined ||
+    markdown === null ||
+    markdown === "" ||
+    typeof markdown !== "string"
+  ) {
+    return "";
+  }
+
   const finalStyles = { ...styles, ...customStyles };
   let reactMailTemplate = "";