'How can I do Image Upscaling (increase resolution) with Sharp?

I have a digital image for which I want to increase its resolution using Sharp. For now all I have is

let image = sharp("image_path").resize({width:1200, height:1200});

However, this seems to only increase the size but not the quality. How can I increase the resolution of an image using Sharp?

node.jsimage-processingsharp


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