Longest Absolute File Path LeetCode solution in JavaScript

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function isFile(path) {
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  return path.includes(".");
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}
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var lengthLongestPath = function (input) {
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  const segments = input.split("\n");
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  let max = 0;
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  let path = [];
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  for (const segment of segments) {
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    if (segment.startsWith("\t")) {
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      const nesting = segment.match(/\t/g).length;
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      while (nesting < path.length) {
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        path.pop();
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      }
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      path.push(segment.replace(/\t/g, ""));
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    } else {
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      path = [segment];
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    }
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    if (isFile(path.at(-1))) {
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      const filePath = path.join("/");
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      if (filePath.length > max) {
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        max = filePath.length;
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      }
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    }
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  }
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  return max;
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};