Function fileReaderReady

fetch.js:175–184

(reader)

}

function fileReaderReady(reader) {
  return new Promise(function(resolve, reject) {
    reader.onload = function() {
      resolve(reader.result)
    }
    reader.onerror = function() {
      reject(reader.error)
    }
  })
}

function readBlobAsArrayBuffer(blob) {
  var reader = new FileReader()