The “typeerror fsevents is not a constructor” is an error message that occurs when working with “fsevents” module in Node.js.
If you’re new to this and don’t know how to troubleshoot this error, you don’t have to worry.
It is because in this article we are going to discuss what this error is all about and why it occurs in your code.
Apart from that, we’ll hand you the solutions that will fix the “typeerror: fsevents is not a constructor” error message.
What is fsevents?
The “fsevents” is a Node.js package or module that provides a platform-specific interface for monitoring file system events on macOS.
It is often used in Node.js applications that need to watch for changes to the file system, such as changes to files or directories.
Additionally, the “fsevents” is an API in macOS that allows applications to register for notifications of changes to a given directory tree.
What is “typeerror fsevents is not a constructor”?
The error message “typeerror fsevents is not a constructor” occurs when you’re trying to use the “fsevents” module as a constructor.
It happens when you are working with Node.js or in a web browser environment.
However, it is not supported by your current environment or setup. Specifically that “fsevents” is not functioning as a constructor as expected.
In addition to that, it usually happens if you are using the “fsevents” module in a React application.
It indicates that there is an issue with how you are trying to use “fsevents” as a constructor in your code, but it’s not defined as such.
For further details, the constructor in JavaScript is a function that is used to create objects. The “fsevents” module provides an API for working with file system events on macOS.
And it includes a constructor that allows you to create an instance of the “fsevents” class.
What are the root causes of “typeerror fsevents is not a constructor”?
The errors occur due to various reasons, such as:
→ This can happen if the fsevents module is not installed correctly.
→ If there are issues with the Node.js version being used.
→ Due to a problem with your Node.js environment or with the way that you have installed and imported the package.
How to fix “typeerror fsevents is not a constructor”
To fix the “typeerror: fsevents is not a constructor” error message, you can try the following solutions:
Time needed: 2 minutes
Here are some steps you can take to solve the issue:
- Verify your Node.js version
Ensure you are using the latest version of Node.js that is compatible with the “fsevents” package.
You can simply check your Node.js version by running the following command in your terminal or command prompt:
To check your current version of Node.js:
→ node -v
When you’re not running the latest version, visit the official Node.js website and download the latest version. - Reinstalling the package or module
If you’re encountering the “typeerror fsevents is not a constructor” error, maybe your Node.js version is up-to-date.
Try reinstalling the package or module. You can do this using the following command:
To install:
→ npm uninstall fsevents
To reinstall:
→ npm install fsevents - Check for conflicts with other packages
The “fsevents” package or module can sometimes conflict with other packages in your project.
Try removing any other packages that might be causing conflicts and see if that resolves the issue. - Use alternative package
If the error still exists after reinstalling the package, you can use an alternative package instead of
“fsevents.”
There are several packages available that provide similar functionality, such as “chokidar” or “watch.” - Verify your code
You may also need to verify your code, making sure that you’re using the package or module correctly and that any dependencies are properly installed.
- Regenerating lockfile
If the error still exists you can try regenerating lockfile.
→ npm i –package-lock-only
Additional Effective solutions
When the above solution does not resolve the error, you can try the following solutions:
A.
- remove node_module and yarn.lock
- yarn install
- yarn start
B.
- npm audit fix –force
C.
- downgrading node to v11.15.0
D.
Use yarn’s selective dependency resolutions.
"resolutions": {
"chokidar": "^3.3.1"
},Reminder!
Ensure that you are using the correct version of Node.js. Take note that the “fsevents” module only works on macOS, however the error message can still appear on other platforms and requires a specific version of Node.js.
Conclusion
The “typeerror fsevents is not a constructor” error message is raised because the “fsevents” package or module is designed to work only on macOS.
However, it might still appear on other platforms.
Luckily, by executing the different solutions that this article has already given, you can definitely resolve the “typeerror fsevents is not a constructor” error message.
We are hoping that this article provides you with sufficient solutions.
You could also check out other “typeerror” articles that may help you in the future if you encounter them.
- Typeerror: bad operand type for unary -: ‘list’
- Typeerror: super expression must either be null or a function
- Typeerror: ‘index’ object is not callable
Thank you very much for reading to the end of this article.
Frequently Asked Questions
What is Python TypeError and what causes it?
TypeError is raised when an operation is applied to an object of the wrong type. Common patterns: calling a non-callable object, adding incompatible types (str + int), passing the wrong number of arguments, or accessing attributes on a NoneType. Each TypeError message names the operation and expected vs actual types, the fix is almost always to convert types explicitly (int(), str()) or fix the wrong variable assignment.
How do I quickly debug a Python TypeError?
Three steps: (1) Read the full error message, it names the exact operation and types involved. (2) Print the type of every variable in that line: print(type(var1), type(var2)). (3) Check what the function expected vs what you passed. Most TypeError fixes are 1-line type casts or fixing a variable that became None unexpectedly.
Should I catch TypeError or let it propagate?
For internal code, let TypeError propagate, it’s almost always a real bug (wrong type passed). For boundary code (parsing user input, third-party API responses), catch TypeError + ValueError together: try: parsed = int(value) except (TypeError, ValueError): parsed = 0. Catching internal TypeErrors hides bugs.
How do I prevent TypeError in production?
Three patterns: (1) Use type hints (def add(a: int, b: int) -> int) and check with mypy / pyright in CI. (2) Validate inputs at boundaries (Pydantic for FastAPI, DRF serializers for Django). (3) Default values that match expected types (return 0 not None for numeric functions). Static typing catches 80% of TypeErrors before runtime.
Where can I find more TypeError fixes?
Browse the TypeError reference hub for 220+ specific TypeError fixes. For broader Python debugging, see the Python Tutorial hub. For related error types, see ValueError and AttributeError guides.
Caren Bautista
Technical Writer at PIES IT Solution
Responsible for crafting clear, well-structured, and beginner-friendly content across the platform. Handles the writing, proofreading, and editorial review of tutorials, guides, and documentation to ensure every article is accurate, readable, and easy to follow.
Expertise: Technical Writing · Content Creation · Documentation · Editorial Writing · JavaScript · TypeScript · Python · Python Errors · HTTP Errors · MS Excel · View all posts by Caren Bautista →