A default error function for node style error handling.

A function that returns the normally hidden `AsyncFunction` constructor

A function that returns the normally hidden `GeneratorFunction` constructor

Combine errors into one

Get callsites from the V8 stack trace API

Settle an async function.

detect and report syntax errors in source code strings

Make a function mimic another one

Perform document inserts, doing validation and calling an error function otherwise.

Throttle a function to limit its execution rate

Higher-order functions for easier error handling

Run the supplied function exactly one time (once)

Emit errors on stdout stream for a spawned child process

Turns partial code location into precise code location

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

Check if something is a generator function

Test whether value is error object

richer JavaScript errors

inject an error listener into a stream

Allows libraries to handle various caller provided asynchronous functions uniformly. Maps promises, observables, child processes and streams, and callbacks to callback style.