Web Reference: Feb 4, 2018 · I got this error that "Sequelize TypeError: Class extends value undefined is not a constructor or null, NodeJS" and solved it using that. If you have the same error, you can use the following solution that I've tried to explain it in code. Jan 16, 2026 · To fix the TypeError, we need to eliminate or mitigate the circular dependency while preserving inheritance and relationships. Let’s walk through actionable steps with our example. First, confirm that a circular dependency exists. Feb 16, 2025 · TypeError: Class extends value undefined is not a function or null. If you've encountered this error, don’t worry! In this post, we'll break it down and explore ways to fix it. What Causes This Error? This error typically happens when a JavaScript class attempts to extend something that is undefined or null. Here are the most common reasons:
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