Fix a bug in utils.ts that crashes the page when mouse reaches left edge of the page #46
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…dge of the page e.pageX will be treated as a falsy value when e.pageX=0. However, 0 is a perfectly valid value. `??` ensures that only undefined e.pageX will result in an error.
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Currently, the page will crash when users interact with the circular input and their mouse cursors touches the left edge of the webpage (pageX = 0).
e.pageXwill be treated as a falsy value whene.pageX=0. However, 0 is a perfectly valid value.??ensures that only undefinede.pageXwill result in an error.