Wrap zod validation errors in user-friendly readable messages

Create an error from multiple errors

Check if value is error

A tiny invariant function

An error subclass for wrapping non-error values

Serialize/deserialize an error into a plain object

Ponyfill and helpers for Error Causes

A drop-in replacement for fs, making various improvements.

An extendable Error class that actually works, with TypeScript definition files, supporting old and new style classes and compatibility even with the oldest browsers

Check if a number is a redirect HTTP status code

Clean up error stack traces

Error parser to parse an error instance into a collection of frames

Vite plugin bridging preview diagnostics, browser errors, and dev-server lifecycle events

Emit errors on stdout stream for a spawned child process

A small utility, used by Fastify itself, for generating consistent error objects across your codebase and plugins.

Create an error with a code

A utility to determine if a value is an Error or specific instance/subclass of an Error type.

An Error subclass that will chain nested Errors and dump nested stacktraces

Checks if any argument is error.

Easily-extendable error for use with ES6 classes