Coding⏱️ 3 min read📅 2026-06-03

How to Fix: ERROR in The Angular Compiler requires TypeScript >=3.1.1 and <3.2.0 but 3.2.1 was found instead

Angular Compiler error due to TypeScript version mismatch.

Quick Answer: Update Angular project to use the latest compatible TypeScript version (3.2.0) or downgrade TypeScript to 3.1.1.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🚀 How to Resolve This Issue
  3. 💡 Conclusion

The error 'ERROR in The Angular Compiler requires TypeScript >=3.1.1 and <3.2.0 but 3.2.1 was found instead' occurs when the Angular compiler is unable to compile your application due to a version mismatch between the required TypeScript version and the installed version.

This issue affects developers who use the Angular framework with TypeScript, particularly those who have recently updated their project's dependencies or are working on new projects that require the latest versions of the frameworks.

🔍 Why This Happens

  • The primary reason for this error is that the Angular compiler has a strict version requirement for TypeScript. The compiler checks for the presence of specific features and APIs in the TypeScript code, which may not be available in newer versions.
  • Another possible cause could be outdated or incompatible dependencies in the project, which can lead to version conflicts.

🚀 How to Resolve This Issue

Updating the project's dependencies

  1. Step 1: Open the terminal and navigate to the root directory of your Angular project using the command `cd /path/to/project`.
  2. Step 2: Run the command `npm install` or `yarn install` to update all dependencies, including TypeScript.
  3. Step 3: Verify that the updated version of TypeScript is installed by checking the package.json file or running the command `npm ls typescript` or `yarn ls typescript`.

Downgrading TypeScript

  1. Step 1: Open the terminal and navigate to the root directory of your Angular project using the command `cd /path/to/project`.
  2. Step 2: Run the command `npm install typescript@3.1.1` or `yarn add typescript@3.1.1` to downgrade TypeScript to version 3.1.1.

💡 Conclusion

To resolve this issue, update your project's dependencies to include the latest version of TypeScript that is compatible with the Angular compiler. If downgrading is not feasible, you can try downgrading TypeScript to a version that meets the requirements. Additionally, ensure that all other dependencies are up-to-date and compatible with the chosen version of TypeScript.

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