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FlowHelpers/1.0.0/copyWithProgress.js

@@ -9,11 +9,17 @@ const copyWithProgress = async ({
   updateProgress,
   label,
   copyMethod = 'auto',
+  bufferSizeMb = 16,
   maxRetries = 2,
   retryDelayMs = 1000,
 }) => {
   const sourceSize = fs.statSync(source).size;
   const sourceSizeMb = (sourceSize / 1024 / 1024).toFixed(1);
+  const normalizedBufferSizeMb = Math.min(
+    Math.max(Number.parseInt(bufferSizeMb, 10) || 16, 1),
+    128,
+  );
+  const bufferSize = normalizedBufferSizeMb * 1024 * 1024;
 
   const report = (percent, message) => {
     const boundedPercent = Math.min(Math.max(percent, 0), 100);
@@ -30,8 +36,8 @@ const copyWithProgress = async ({
     const startMs = Date.now();
     let copiedBytes = 0;
     let nextProgressPercent = 0;
-    const rd = fs.createReadStream(source, { highWaterMark: 4 * 1024 * 1024 });
-    const wr = fs.createWriteStream(destination, { highWaterMark: 4 * 1024 * 1024 });
+    const rd = fs.createReadStream(source, { highWaterMark: bufferSize });
+    const wr = fs.createWriteStream(destination, { highWaterMark: bufferSize });
     let settled = false;
     const fail = (error) => {
       if (settled) return;