stdlib-js/assert-is-error

Return the prototype of a provided object.

Determine the specification defined classification of an object.

Test if a value is a boolean.

Check if the runtime is a web browser.

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

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 cases including unit tests, server side functional tests and browser tests. Built for scale

Minimal TAP output formatter.

Benchmark harness.