isifier

A validation library creator

Table of contents

• Summary
• Usage
  • addTest
• Other methods
  • createInstance
• Browser support
• Development

Summary

We all have seen a thousand validation libraries out there, but there is something they all have in common: they have way, way more tests than your project could ever need. All you need to do is validate strings, and you pull in something that validates social security numbers, canadian zip codes, and IPV6 addresses, which adds excess bloat to your application without any additional benefit.

With isifier, the library is only as targeted as you need it to be, as all it does is create a namespace for your tests and a method to add to it. It is 440 bytes minified and gzipped.

Usage

import is from "isifier";
 
// add common type tests
is.addTest("string", value => typeof value === "string");
 
console.log(is.string("foo")); // true
console.log(is.string(123)); // false
 
// or complex validation
is.addTest("important", ({ isImportant, textContent }) => {
  return (
    isImportant ||
    (is.string(textContent) && textContent.toLowerCase().includes("important"))
  );
});
 
console.log(is.important({ isImportant: true, textContent: null })); // true
console.log(
  is.important({
    isImportant: false,
    textContent: "I have IMPORANT stuff!"
  })
); // true
 
// it also adds "all" and "any" convienence methods to test multiple values at once
console.log(is.all.string("foo", "bar", "baz")); // true
console.log(
  is.any.important(
    { isImportant: false, textContent: null },
    { isImportant: false, textContent: "I am important" }
  )
); // true

addTest

is.addTest(name: string, validator: function): boolean

Adds a new validator test to the is object, accessible on all uses of is from that point on.

Other methods

createInstance

Create a unique instance of isifier. Useful if you want to avoid collisions with other library applications.

import is, { createInstance } from "isifier";
 
is.addTest("number", value => typeof value === "number");
 
const instance = createInstance();
 
console.log(instance === is); // false
 
instance.addTest("number", value => typeof value === "number" && !isNaN(value));
 
console.log(is.number(NaN)); // true
console.log(instance.number(NaN)); // false

Browser support

• Chrome (all versions)
• Firefox (all versions)
• Edge (all versions)
• Opera 15+
• IE 9+
• Safari 6+
• iOS 8+
• Android 4+

Development

Standard stuff, clone the repo and npm install dependencies. The npm scripts available:

• build => run webpack to build development dist file with NODE_ENV=development
• build:minified => run webpack to build production dist file with NODE_ENV=production
• dev => run webpack dev server to run example app / playground
• dist => runs build and build:minified
• lint => run ESLint against all files in the src folder
• prepublish => runs prepublish:compile when publishing
• prepublish:compile => run lint, test:coverage, transpile:es, transpile:lib, dist
• test => run AVA test functions with NODE_ENV=test
• test:coverage => run test but with nyc for coverage checker
• test:watch => run test, but with persistent watcher
• transpile:lib => run babel against all files in src to create files in lib
• transpile:es => run babel against all files in src to create files in es, preserving ES2015 modules (for pkg.module)