varify variabe is a canvas context
npm install is-canvas-contextvarify a variable is a canvas context
Download node at nodejs.org and install it, if you haven't already.
``sh`
npm install is-canvas-context --save
`js
import isCanvasContext from './'
let canvas = document.createElement('canvas')
isCanvasContext(canvas) // false
isCanvasContext(canvas.getContext('2d')) // true
isCanvasContext('not a context or canvas') // false
`
isCanvasContext(ctx:any):boolean`
ISC