Lazy assertions without performance penalty

lazy-ass

Fast and boilerplate-free precondition checks for javascript.

offensive

Type assertion library for js. Both primitive and custom types supported.

Helps you confirm the existence of specified falsy values (e.g. 0)

A set of ESLint rules to make your code better.

Helps you deny the existence of specified truthy values (e.g. 'someString', aParticularObject)

A handy utility for defensively extracting props from objects