loadimg.js

let loadImage = (img, src)=>{
	return new Promise((resolve, reject)=>{
		img.onload = ()=>{
			resolve(img)
		}
		img.src = src
	})
}

readimg.js

let readImage = ()=>{
	return new Promise((resolve, reject)=>{
		let reader = new FileReader();
		reader.onload = () => {
			resolve(reader.result)
		};
		reader.onerror = (e) => {
			reject(e)
		};
		reader.readAsDataURL( file )
	})
}