Rule proposal: prefer-blob-reading-methods

[fisker]

FileReader is kind of old, and it doesn't use promise. A better way to read file should be "blob reading methods"

Fail

const arrayBuffer = await new Promise((resolve, reject) => {
	const fileReader = new FileRead();
	fileReader.onload = () => resolve(fileReader.result)
	fileReader.onerror = () => reject(fileReader.error)
	fileReader.readAsArrayBuffer(blob);
});

const arrayBuffer = await new Response(blob).arrayBuffer();

Pass

const arrayBuffer = await blob.arrayBuffer();

[sindresorhus]

This is now accepted.

[jimmywarting]

most often when you want to display a simple preview from a file input then it's faster to just display a blob:url from using URL.createObjectURL (as dataURL takes time to encode/decode and uses more memory)

but you always need to be carful of when you are not revoking object urls