Unable to use flip() twice on same input

[AmeyMore98]

I'm using sharp(version 0.29.3), and trying to chain multiple flip() operations, but sharp applies this operation only once. I also tried disabling sharp's cache using sharp.cache(false), but it still doesn't work.
This happens for other operations also, like flop(), rotate() etc.

Here's my code:

const sharp = require("sharp");
sharp.cache(false);
sharp("/home/Downloads/temp/ip3.jpg").flip().flip().toFile("/home/Downloads/temp/op.jpg").then(console.log);

Input image:

Output image:

Thanks for your help!

[lovell]

Yes, if you really need to do this then split the task into two pipelines.

[AmeyMore98]

Ok, got it. Is this required for all operations or just flip()?
Also can you please help with some sample code or docs for the pipeline approach?
Thanks.

[lovell]

If you need to repeat a given operation multiple times, yes. There's some discussion about this at #241

const flippedOnce = await sharp(input).flip().toBuffer();
const flippedTwice = await sharp(flippedOnce).flip().toBuffer();

[AmeyMore98]

This works, thanks!