Test if an object has a specified property.

Test if a value is a boolean.

Test if a value is a function.

Test if a value is a number having a nonnegative value.

Test if a value is a plain object.

Test if a value is a string.

Copy enumerable own properties from one or more source objects to a target object.

Insert supplied variable values into a format string.

Define a non-enumerable read-only property.

Implement prototypical inheritance by replacing the prototype of one constructor with the prototype of another constructor.

Add a callback to the next tick queue.

Lightweight debugging utility for Node.js and the browser

Node.js Streams, a user-land copy of the stream library from Node.js

Format an error message for production.

Writable stream for inspecting streamed data.

Standard output.

Function which does nothing.

tap-producing test harness for node and browsers

Yet another JS code coverage tool that computes statement, line, function and branch coverage with module loader hooks to transparently add coverage when running tests. Supports all JS coverage use ca

Minimal TAP output formatter.

Benchmark harness.