All Errors

This error occurs when you enable TypeScript's 'allowImportingTsExtensions' option without also enabling 'noEmit' or 'emitDeclarationOnly'. The fix depends on whether you're using a bundler or TypeScript runtime.

This TypeScript error occurs when you apply a decorator to both the getter and setter of a class property. TypeScript only allows decorators on the first accessor (getter or setter) in document order, as decorators apply to the unified property descriptor that encompasses both accessors, not each declaration separately.

This TypeScript error occurs when you declare abstract methods or properties in a class that is not itself marked as abstract. Abstract members can only exist in abstract classes that serve as base classes for inheritance.

This error occurs when a function calls itself recursively without a proper base case or termination condition, exhausting the call stack. Stack overflow can also happen during deep object operations, circular event listeners, or when processing deeply nested data structures.

TypeScript compiler error that occurs when using an incompatible combination of allowJs, checkJs, and declaration compiler options. This happens when these options conflict in your tsconfig.json file and need to be properly configured together.

This error occurs when you try to use the 'declare' keyword in a regular .ts file instead of a .d.ts declaration file. Ambient declarations are type-only declarations that can only exist in .d.ts files or within declare namespace blocks.

This error occurs when a server is temporarily unable to handle requests, typically due to being overloaded, down for maintenance, or having unavailable dependencies. In Node.js, you may receive 503 from external APIs or return 503 when your own application cannot accept traffic. This guide covers both scenarios.

This error occurs when you try to assign a value to an invalid target, such as a function call result, a literal value, or an optional property access. TypeScript requires the left side of an assignment to be a valid lvalue like a variable or object property.

This error occurs when attempting to write data to a Node.js stream that has been closed, ended, or destroyed. Common causes include writing after calling end(), writing to destroyed streams, or writing to inherently read-only streams.

This error occurs when an exception is thrown inside a callback function and not properly caught. Since callbacks execute asynchronously, exceptions thrown within them cannot be caught by surrounding try-catch blocks, causing the error to propagate and potentially crash your application.

When using conditional rendering with the && operator, React renders the number 0 instead of nothing when the left-hand expression evaluates to 0. This common issue occurs because React treats numbers as valid children and renders them, unlike boolean values which are skipped.

SSL protocol errors occur when Node.js cannot verify an HTTPS server's certificate. This happens due to missing intermediate certificates, self-signed certificates, expired certificates, or incorrect system time. Learn how to diagnose and fix certificate verification failures safely.

Prisma cannot establish a connection to your database server. This typically occurs due to incorrect connection strings, network issues, firewall restrictions, or serverless databases in idle state.

This error occurs when a callback function doesn't follow Node.js's error-first callback convention, which requires the first parameter to be reserved for an error object. Node.js expects callbacks to accept an error as the first argument (null if no error), followed by result data.

This error occurs when attempting to read data from a Node.js stream that is not in a readable state, has already been consumed, or was never properly initialized as readable.

React warns when an input element specifies both value and defaultValue props. These props represent two different approaches to managing form state: controlled (value) and uncontrolled (defaultValue) components, and cannot be mixed on the same element.

This error occurs when an asynchronous operation in Node.js is deliberately cancelled using AbortController or times out. It indicates that the operation was terminated before completion, either programmatically or due to exceeding a time limit.

This error occurs when Node.js child_process.spawn() cannot locate or execute the specified command or binary. ENOENT ('Error: No such file or directory') typically means the executable is missing, not installed, misspelled, or not in the system PATH. This frequently happens when trying to run external commands, system binaries, or globally installed packages from within Node.js.

This error occurs when you try to use a function for type narrowing without declaring an assertion signature. TypeScript 3.7+ requires explicit 'asserts' syntax to recognize type narrowing behavior in custom functions.

This error occurs when you annotate an async function with a non-Promise return type. Async functions always return a Promise, so TypeScript requires you to wrap the return type in Promise<T>.