Load and save

src/download.ts

@@ -0,0 +1,29 @@
+export function download(filename: string, data: Uint8Array) {
+  const tag = document.createElement("a");
+  tag.style.display = "none";
+  document.body.appendChild(tag);
+  const blob = new Blob([data], {type: "octet/stream"}),
+    url = window.URL.createObjectURL(blob);
+  tag.href = url;
+  tag.download = filename;
+  tag.click();
+  window.URL.revokeObjectURL(url);
+  document.body.removeChild(tag);
+}
+
+export async function streamToArrayBuffer(stream: ReadableStream<Uint8Array>): Promise<Uint8Array> {
+  let result = new Uint8Array(0);
+  const reader = stream.getReader();
+  while (true) { // eslint-disable-line no-constant-condition
+    const { done, value } = await reader.read();
+    if (done) {
+      break;
+    }
+
+    const newResult = new Uint8Array(result.length + value.length);
+    newResult.set(result);
+    newResult.set(value, result.length);
+    result = newResult
+  }
+  return result;
+}