get buffer from file input in javascript

To get a buffer from a file input in JavaScript, you can read the contents of the file using the FileReader API and then convert it to a buffer using the Buffer constructor. Here is an example code snippet:

index.tsx
const fileInput = document.getElementById('fileInput');
const reader = new FileReader();

reader.onload = function() {
  const buffer = Buffer.from(reader.result);
  // Do something with the buffer
}

reader.readAsArrayBuffer(fileInput.files[0]);
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In this example, we use document.getElementById to get the file input element, create a new FileReader, and set its onload event to a function that converts the result to a buffer using Buffer.from(). Finally, we call readAsArrayBuffer() to start reading the contents of the file.