<ul><li>Developing a Next.js application with an Express server in TypeScript may lead to encountering the TS1259 error regarding default imports and the 'esModuleInterop' flag.</li><li>The TS1259 error arises due to default import issues with CommonJS modules, which can be resolved by enabling the 'esModuleInterop' flag in your tsconfig.json.</li><li>Ensure your tsconfig.json file contains 'esModuleInterop': true and validate import statements like 'import express, { Request, Response } from "express"'.</li><li>To fix the TS1259 error, restart TypeScript compiling, validate imports, compile your application, and understand the importance of 'esModuleInterop' for better module interoperability.</li></ul>

How to Fix TS1259 Error in Next.js with Express and TypeScript?

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