be-type

be-type is based on ECMAScript2015+ proxy feature

Usage

yarn add be-type
npm install --save be-type

JavaScript:

import be from 'be-type';
be.function(()=>{}); // true

Custom type check:

//be.js
import be,{setBe} from 'be-type';
export default setBe({
    Negative:(value)=> be.Number(negative) && negative < 0
})
//other.js
import be from '../be.js';
be.Negative(-1); // true

API

Interface Rule:

1. If the first letter of the API is lowercase, then it refers to toString.call(value), the type returned by call.

be.function(()=>{}) equivalent toString.call(()=>{}) ==== "[object Function]"

be.generatorFunction(function* (){}) equivalent toString.call(function* (){}) ==== "[object GeneratorFunction]"

be.uint8Array(new Uint8Array()) equivalent toString.call(new Uint8Array()) ==== "[object Uint8Array]" etc..

2. if the first letter of the API is Uppercase, it means not toString.call(value), Custom type returned by call

Default built-in type check:

Interface	Spec
Function	plain function
Object	plain object
String	basic string
Number	basic number
Boolean	basic boolean
NaN	strict equality to NaN
Nil	null or undefined
Empty	none length
Infinity	strict equality to Infinity
Finite	basic number and not NaN or Infinity
Native	pristine native function
SafeInteger	based on Number.isSafeInteger
Integer	based on Number.isInteger
Element	HTML Element