All Errors

This error occurs when npm lacks the necessary file system permissions to access directories during package installation. EACCES (Access Denied) typically happens when trying to install global packages or when npm directories are owned by root instead of your user account.

This React Testing Library warning occurs when component state updates happen in tests without proper async handling. The warning indicates untested asynchronous behavior in your components.

React PropTypes validation warns when children prop has wrong type - passing an object, array, or function when component expects single ReactElement, or vice versa. This type mismatch causes runtime warnings during development.

The 'JavaScript heap out of memory' error occurs when Node.js runs out of allocated memory during build or development processes. This commonly happens in Create React App projects with large codebases or many dependencies, requiring increased memory allocation.

This error occurs when you attempt to set an HTTP response status code to a value outside the valid range of 100-599. The HTTP specification requires status codes to be three-digit numbers within this range.

This error occurs when a client sends a request body that exceeds the server's configured size limit. By default, Express limits request bodies to 100KB, causing this error when larger payloads are sent.

This warning appears when running Node.js with the --pending-deprecation flag or NODE_PENDING_DEPRECATION environment variable. It alerts developers that the Buffer() constructor is scheduled for eventual removal, giving advance notice to update code before the feature becomes fully deprecated.

This error occurs when a derived class attempts to override an abstract member from a parent abstract class in a way that violates TypeScript's abstraction rules. The fix typically involves properly implementing the abstract member as a concrete method, or understanding inheritance constraints when intermediate abstract classes are involved.

This error occurs when JSX code is used in a file without properly importing React. With React 17+, the new JSX transform eliminates the need for explicit imports, but configuration issues or older React versions may still cause this error.

This error occurs when React.lazy receives an invalid component instead of a Promise that resolves to a function component. Common causes include missing default exports, returning objects instead of components, or incorrect import syntax. The fix involves ensuring the lazily-loaded module exports a valid React component as its default export.

When using React.lazy() for code splitting, errors during chunk loading or component initialization are not caught unless wrapped in an Error Boundary. This leads to unhandled promise rejections and white-screen failures.

This warning occurs when React.lazy() receives the same component value instead of a promise from a dynamic import. It typically happens when the lazy function is not properly structured to return an import() statement. Understanding the correct lazy() syntax and avoiding duplicate imports prevents this warning and ensures code-splitting works as intended.

This warning occurs when a React component receives a prop that doesn't match its PropTypes definition. The actual prop type and expected type are mismatched, causing React to warn you during development.

This error occurs when you render a component created with React.lazy() without wrapping it in a Suspense boundary. React.lazy defers loading component code until it's needed, but while the code is loading, the component "suspends". Without Suspense to handle this suspended state, React throws an error. Wrapping the lazy component in a Suspense boundary with a fallback UI fixes the issue.

This RangeError occurs when passing a timeout value that exceeds the maximum 32-bit unsigned integer limit (4,294,967,295 milliseconds, about 49.7 days) to timer functions like setTimeout or setInterval.

This error occurs when JSX syntax is not properly compiled to JavaScript. Your code contains JSX (the `<` character starting an HTML-like tag) but Babel or another transpiler has not been configured to transform it, causing the parser to fail.

This webpack error occurs when Create React App or a custom webpack configuration encounters a file type it cannot process because no loader is configured for it. Common triggers include importing unsupported file types, incorrect babel configuration, or missing type declarations for assets like SVGs or CSS modules.

This ESLint warning occurs when you use variables, props, or state inside hooks like useEffect, useCallback, or useMemo without including them in the dependency array. Missing dependencies can cause stale closures where your hook uses outdated values, leading to subtle bugs that are hard to debug.

A "socket hang up" error occurs when a network connection is unexpectedly closed or terminated before the operation completes. This typically happens during HTTP requests when a server closes the connection without properly finishing the response, or when the socket times out waiting for data.

This warning appears when SSH cannot find or access the identity file (private key) at the specified path. It typically indicates the key file doesn't exist, the path is incorrect, or the file has been moved.