blob to buffer in typescript

index.ts
function blobToBuffer(blob: Blob): Promise<Buffer> {
  return new Promise<Buffer>((resolve, reject) => {
    const fileReader = new FileReader();
    fileReader.onload = () => {
      if (fileReader.result instanceof ArrayBuffer) {
        const buffer = Buffer.from(fileReader.result);
        resolve(buffer);
      } else {
        reject(new Error("Failed to convert Blob to Buffer."));
      }
    };
    fileReader.onerror = (error) => {
      reject(error);
    };
    fileReader.readAsArrayBuffer(blob);
  });
}

// Usage
const blob = new Blob(["Hello, World!"], { type: "text/plain" });
blobToBuffer(blob)
  .then((buffer) => {
    console.log(buffer); // Buffer object
  })
  .catch((error) => {
    console.error(error);
  });
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