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common/resources/client/uploads/utils/pretty-bytes.ts

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+// Adapted from https://github.com/Flet/prettier-bytes/
+// Changing 1000 bytes to 1024, so we can keep uppercase KB vs kB
+// ISC License (c) Dan Flettre https://github.com/Flet/prettier-bytes/blob/master/LICENSE
+export function prettyBytes(num?: number, fractionDigits = 1): string {
+  if (num == null || Number.isNaN(num)) return '';
+  const neg = num < 0;
+  const units = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
+
+  if (neg) {
+    num = -num;
+  }
+
+  if (num < 1) {
+    return `${(neg ? '-' : '') + num} B`;
+  }
+
+  const exponent = Math.min(
+    Math.floor(Math.log(num) / Math.log(1024)),
+    units.length - 1
+  );
+  num = Number(num / Math.pow(1024, exponent));
+  const unit = units[exponent];
+
+  if (num >= 10 || num % 1 === 0) {
+    // Do not show decimals when the number is two-digit, or if the number has no
+    // decimal component.
+    return `${(neg ? '-' : '') + num.toFixed(0)} ${unit}`;
+  }
+  return `${(neg ? '-' : '') + num.toFixed(fractionDigits)} ${unit}`;
+}