be-type

be-type is based on ECMAScript2015+ proxy feature


$3

``bash
yarn add be-type
npm install --save be-type
`
JavaScript:
`javascript
import be from 'be-type';
be.function(()=>{}); // true
`
Custom type check:
`javascript
//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
`

$3

#### 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 |