Test if a value is a function.

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

Buffer.

Insert supplied variable values into a format string.

Format an error message for production.

Test if a value is a Buffer object.

Exponential function.

Proxies nodejs require in order to allow overriding dependencies during testing.

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.