mongoose validation to ensure referenced object id exists

Retry a function until or while it passes an assertion

🚀 Ensure path exists

⏲ Await until an object initialises before using it.

[WIP] Design by Contract library for PHP

VUT is a lightweight framework for rule validation and unit testing in Vlang. Simplify code correctness checks, data validation, and unit testing in your V projects with this efficient tool.

How To Make Sure jQuery Is Loaded And Only Once

Ensure that you never commit with the wrong commit author again.

Ensure that the arguments of your constructor meet constraints defined through decorators

Ensures that a string or an array starts with specified value.

Argument assertion for JavaScript and Typescript

If given value is not an object, returns an object with one entry.

A no frills library for validating arguments

Utilities to validate/ensure emails against a whitelist. 👮‍♂️📧

get value of an environment variable; throw if undefined or empty string

A simple framework to ensure variables and parameters

Provide simple checks of method parameters on NodeJS

Transform JS function code, function bodies, modules, or files into valid functions using AST transform and VM wizardry.

Prevents a string or an array from starting with specified value.

Prevents a string or an array from ending with specified value.