ensure

Simple API to do checks and keep good error reporting. For node.js or browser.

Installation

npm install -s @allnulled/ensure

Then on node.js:

const ensure = require("@allnulled/ensure");

Or on browser:

<script src="node_modules/@allnulled/ensure/ensure.js"></script>

This will overwrite the global ensure as a function.

Usage

This is all the API. With can you can do anything: it must return true, otherwise it will throw an error.

The others are variants of can.

const v = 500;

ensure({ v }).is(500);
ensure({ v }).isnt(501);
ensure({ v }).type("number");
ensure({ v }).notType("string");
ensure({ v }).can(n => n > 100);
ensure({ v }).cant(n => n < 100);
ensure({ v }).throws(n => { throw new Error("wherever"); });
ensure({ v }).doesntThrow(n => "ok!");