From 27a34eb99243ad40e625ee4d91224863affd0bf8 Mon Sep 17 00:00:00 2001
From: lordelogos <paulehiks@gmail.com>
Date: Tue, 4 Jul 2023 14:39:41 +0100
Subject: [PATCH] feat: added type checks and handled null type values

---
 CHANGELOG.md                                  |  7 +++++
 .../parseMarkdownToReactEmailJSX.test.ts      | 30 +++++++++++++++++++
 package.json                                  |  2 +-
 src/utils.ts                                  |  9 ++++++
 4 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index d99a22b..d19a34d 100644
--- a/CHANGELOG.md
+++ b/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
diff --git a/__tests__/parseMarkdownToReactEmailJSX.test.ts b/__tests__/parseMarkdownToReactEmailJSX.test.ts
index 0f5a22e..ac5bd74 100644
--- a/__tests__/parseMarkdownToReactEmailJSX.test.ts
+++ b/__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(
diff --git a/package.json b/package.json
index d4afa0c..f7c3212 100644
--- a/package.json
+++ b/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",
diff --git a/src/utils.ts b/src/utils.ts
index e0aacdc..47efcf6 100644
--- a/src/utils.ts
+++ b/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 = "";