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. Normalizing isn't
  // necessary in that case, the path should already be absolute.
  filename = isFileURI(filename) ? new URL(filename) : nodePath.normalize(filename);
  var ret = fs.readFileSync(filename);
#if ASSERTIONS
  assert(ret.buffer);
#endif
  return ret;
};

readAsync = (filename, binary = true) => {
  // See the comment in the `readBinary` function.
  filename = isFileURI(filename) ? new URL(filename) : nodePath.normalize(filename);
  return new Promise((resolve, reject) => {
    fs.readFile(filename, binary ? undefined : 'utf8', (err, data) => {
      if (err) reject(err);
      else resolve(binary ? data.buffer : data);
    });
  });
};