Software⏱️ 2 min read📅 2026-05-31

How to Fix: Confusing "duplicate identifier" Typescript error message

Learn how to fix: Confusing "duplicate identifier" Typescript error message.

Quick Answer: Try checking your system settings or restarting.

The 'duplicate identifier' error in TypeScript occurs when a variable, function, or property is defined multiple times within the same scope. This can happen due to incorrect use of the `--include` flag during compilation or misunderstanding of how dependencies work.

🔍 Why This Happens

  • When you use the `--include` flag without specifying the correct path, it can lead to duplicate definitions.

🚀 How to Resolve This Issue

Method 1: Importing Correctly

  1. Step 1: Ensure that you are importing the correct module or file.

Method 2: Using `--include` Correctly

  1. Step 1: Specify the correct path to the file or module using the `--include` flag.

🎯 Final Words

To avoid this error, make sure to carefully review your import statements and the `--include` flags used during compilation. By following these steps, you can resolve the 'duplicate identifier' error in TypeScript.

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