index.js

/* global Blob File */

const toString = Object.prototype.toString;
const withNativeBlob = typeof Blob === 'function' ||
                        typeof Blob !== 'undefined' && toString.call(Blob) === '[object BlobConstructor]';
const withNativeFile = typeof File === 'function' ||
                        typeof File !== 'undefined' && toString.call(File) === '[object FileConstructor]';
const withNativeArrayBuffer = typeof ArrayBuffer === 'function';

// ArrayBuffer.isView method is not defined in IE10
const isView = (obj) => {
  return typeof ArrayBuffer.isView === 'function' ? ArrayBuffer.isView(obj) : (obj.buffer instanceof ArrayBuffer);
};

/**
 * Module exports.
 */

module.exports = hasBinary;

/**
 * Checks for binary data.
 *
 * Supports Buffer, ArrayBuffer, Blob and File.
 *
 * @param {Object} anything
 * @api public
 */

function hasBinary (obj) {
  if (!obj || typeof obj !== 'object') {
    return false;
  }

  if (Array.isArray(obj)) {
    for (let i = 0, l = obj.length; i < l; i++) {
      if (hasBinary(obj[i])) {
        return true;
      }
    }
    return false;
  }

  if (withNativeArrayBuffer && (obj instanceof ArrayBuffer || isView(obj)) ||
    (withNativeBlob && obj instanceof Blob) ||
    (withNativeFile && obj instanceof File)
  ) {
    return true;
  }

  // see: https://github.com/Automattic/has-binary/pull/4
  if (obj.toJSON && typeof obj.toJSON === 'function' && arguments.length === 1) {
    return hasBinary(obj.toJSON(), true);
  }

  for (const key in obj) {
    if (Object.prototype.hasOwnProperty.call(obj, key) && hasBinary(obj[key])) {
      return true;
    }
  }

  return false;
}