insist

A drop-in replacement for assert, with a better default message.

var assert = require('insist');

// AssertionError: assert(3 instanceof Function);
assert(3 instanceof Function);

//plus all properties of assert
assert.equal(foo, bar); // AssertionError: "baz" == "quux" from assert.equal(foo, bar);
assert.ok();
assert.deepEqual();
// etc...

Also, turn off these assertions with NO_ASSERT=1 env var.