upstream/emscripten/src/node_shell_read.js

/**
 * @license
 * Copyright 2019 The Emscripten Authors
 * SPDX-License-Identifier: MIT
 */

readBinary = (filename) => {
  // We need to re-wrap `file://` strings to URLs.
  filename = isFileURI(filename) ? new URL(filename) : filename;
  var ret = fs.readFileSync(filename);
#if ASSERTIONS
  assert(Buffer.isBuffer(ret));
#endif
  return ret;
};

readAsync = async (filename, binary = true) => {
  // See the comment in the `readBinary` function.
  filename = isFileURI(filename) ? new URL(filename) : filename;
  var ret = fs.readFileSync(filename, binary ? undefined : 'utf8');
#if ASSERTIONS
  assert(binary ? Buffer.isBuffer(ret) : typeof ret == 'string');
#endif
  return ret;
};