All Errors

This error occurs when Node.js cannot resolve a hostname to an IP address through DNS lookup. It commonly happens with network requests using fetch, axios, or http when the domain name is misspelled, the DNS server is unreachable, or the hostname does not exist.

This TypeScript error occurs when a decorator factory doesn't return a function as expected. Decorator factories are functions that return decorator functions, and forgetting the return statement or returning undefined will cause this error. Fix it by ensuring your factory returns a proper decorator function.

This TypeScript error occurs when a parameter decorator function has an explicit return type other than 'void' or 'any'. Parameter decorators are metadata-only tools that cannot modify decorated parameters, so TypeScript enforces strict return type constraints.

This error occurs when you try to call the .map() method on a variable that is undefined, typically when rendering lists in React components. The issue happens because data hasn't loaded yet, a prop wasn't passed, or an API response is being used before it's fetched.

This TypeScript error occurs when you try to use decorators in unsupported contexts like class expressions, anonymous classes, or ambient declarations. The fix involves restructuring your code to use decorators only on named class declarations, methods, properties, accessors, or parameters.

This TypeScript error occurs when you use parameter decorators without enabling the emitDecoratorMetadata compiler option. Parameter decorators rely on metadata reflection to function properly, which requires both experimentalDecorators and emitDecoratorMetadata to be enabled in tsconfig.json.

This TypeScript error occurs when decorators are used in unsupported locations, such as class expressions, anonymous classes, nested classes, or standalone functions. The fix involves moving decorators to supported declarations like top-level classes, methods, properties, or parameters.

This error occurs when your code tries to access a property or call a method on a value that is undefined, often due to API data not yet being loaded, incorrect data structure assumptions, or missing null/undefined checks. This is one of the most common React errors and is usually fixed by validating data exists before accessing it or using optional chaining and nullish coalescing operators.

This TypeScript error occurs when generating declaration files (.d.ts) for code that exports a type or interface that hasn't been explicitly exported from the module. The compiler cannot create valid type declarations when the default export references private (unexported) types.

This TypeScript error occurs when an enum member lacks an explicit initializer in contexts where TypeScript cannot automatically infer its value. This happens after computed members, in string enums, or when mixing numeric and string values in heterogeneous enums.

This webpack compilation error occurs when your build system encounters a file type it doesn't know how to process. In React projects, this commonly happens when importing non-JavaScript files (CSS, images, fonts, etc.) without the proper webpack loaders configured. The fix involves adding the appropriate loader to your webpack configuration or using a create-react-app build system that handles loaders automatically.

This TypeScript/ESLint warning appears when you destructure variables from an object or array but never use those variables in your code. The fix involves either using the destructured variables, removing them, or marking them as intentionally unused with an underscore prefix.

This error occurs when your Node.js application exceeds the operating system's limit on the number of file descriptors that can be opened simultaneously. File watchers like fs.watch() are particularly affected, especially in development environments using tools like Webpack, Jest, or file watching services.

The ELIFECYCLE error occurs when an npm script defined in package.json fails during execution and exits with a non-zero status code. This is a wrapper error that indicates the underlying script command encountered a problem.

This error occurs when Node.js cannot write a heap snapshot file using v8.writeHeapSnapshot(). It typically indicates insufficient disk space, lack of write permissions in the target directory, or insufficient memory to complete the snapshot operation.

This error occurs when node-gyp attempts to compile native Node.js modules on Windows but cannot locate VCBuild.exe, a component of Visual Studio C++ build tools. It typically happens during npm install when packages require native compilation.

This error occurs when you accidentally pass an object (using curly braces {}) instead of an array (using square brackets []) as the second argument to useCallback. React requires the dependency list to be an array, not a plain object.

This error occurs when npm lifecycle scripts (preinstall, postinstall, prepublish, etc.) fail during package installation. These scripts are defined in package.json and run at specific stages of the installation process. Failures typically stem from missing build tools, permission issues, or incompatible dependencies.

This error occurs when node-gyp cannot locate a Python executable to compile native Node.js addons. Python is a required dependency for node-gyp to build C++ modules during npm package installation.

This error occurs when node-gyp cannot find a C++ compiler on your system. node-gyp is a tool used by Node.js packages to compile native C++ modules. It requires a C++ compiler (like g++ on Linux, clang on macOS, or Visual Studio on Windows) to be installed and properly configured.