Cause and solution for "Module 'markdown-it' not found" in TypeScript (@types/markdown-it)

Introduction

While developing an app with TypeScript, I received the error:

Cannot find module 'markdown-it' or its corresponding type declarations

This article briefly summarizes how to resolve this issue.

Solution

Cause

Because markdown-it is a JavaScript library, it did not include the type definition file (.d.ts) required by TypeScript.
In other words, the error occurred because markdown-it is a JavaScript library and does not contain type definitions.

Solution (This is all you need)

Install the type definition package.
tsx
npm install -D @types/markdown-it
`

This will allow TypeScript to recognize type information, and the error will be resolved immediately.

Summary

The cause of the error was not the implementation, but simply a lack of type definitions for TypeScript. When using JavaScript libraries with TypeScript, type definitions may not be included.