feat: Add method toBlob

[zhe-he]

Before this method existed, I needed to do it this way.

const base64 = object.toDataURL();
const url = URL.createObjectURL(dataurl2blob(base64));

After this method was added, I only need to do it this way.

const blob = await object.toBlob();
const url = URL.createObjectURL(blob);

#3283

[codesandbox]

Review or Edit in CodeSandbox

Open the branch in Web Editor • VS Code • Insiders

Open Preview

[asturur]

This is fine.
I need to think a second of the api options but is ok to add this

[zhe-he]

The export type might need to add support for WebP.

https://github.com/fabricjs/fabric.js/blob/master/src/typedefs.ts#L46
export type ImageFormat = 'jpeg' | 'png'; ->
export type ImageFormat = 'jpeg' | 'png' | 'webp';

[asturur]

Yes webP support can be added, is well supported now

[asturur]

The export type might need to add support for WebP.

https://github.com/fabricjs/fabric.js/blob/master/src/typedefs.ts#L46 export type ImageFormat = 'jpeg' | 'png'; -> export type ImageFormat = 'jpeg' | 'png' | 'webp';

We may try this in another PR, We need to verify if node-canvas does webp or we need to have different type for node/browser