add package.json to install via npm

[rifler]

No description provided.

[aCandidMind]

Somebody else already pushed it: https://www.npmjs.com/package/canvas-toBlob

[tinohager]

I think this package is no longer needed
https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toBlob

My solution via vue

async downloadImage () {
    const canvas = this.$refs.canvas
    const blob = await new Promise(resolve => canvas.toBlob(resolve))

    const downloadLink = document.createElement('a')
    downloadLink.href = window.URL.createObjectURL(blob)
    downloadLink.download = 'myimage.png'
    downloadLink.click()
}