first commit

resources/frontend/core/utils/file.js

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+export function downloadBlob(blob, fileName) {
+    if (window.navigator && window.navigator.msSaveOrOpenBlob) {
+        window.navigator.msSaveOrOpenBlob(blob, fileName);
+    } else {
+        const link = document.createElement('a');
+        link.href = window.URL.createObjectURL(blob);
+        link.setAttribute('download', fileName);
+        document.body.appendChild(link);
+        link.click();
+    }
+}
+
+/**
+ * Format bytes as human-readable text.
+ *
+ * @param bytes Number of bytes.
+ * @param si True to use metric (SI) units, aka powers of 1000. False to use
+ *           binary (IEC), aka powers of 1024.
+ * @param dp Number of decimal places to display.
+ *
+ * @return Formatted string.
+ */
+export function humanFileSize(bytes, si = false, dp = 1) {
+    const thresh = si ? 1000 : 1024;
+
+    if (Math.abs(bytes) < thresh) {
+        return bytes + ' B';
+    }
+
+    const units = si
+        ? ['kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB']
+        : ['KiB', 'MiB', 'GiB', 'TiB', 'PiB', 'EiB', 'ZiB', 'YiB'];
+    let u = -1;
+    const r = 10 ** dp;
+
+    do {
+        bytes /= thresh;
+        ++u;
+    } while (Math.round(Math.abs(bytes) * r) / r >= thresh && u < units.length - 1);
+
+    return bytes.toFixed(dp) + ' ' + units[u];
+}