src/node_shell_read.js

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

read_ = (filename, binary) => {
#if SUPPORT_BASE64_EMBEDDING
  var ret = tryParseAsDataURI(filename);
  if (ret) {
    return binary ? ret : ret.toString();
  }
#endif
  // 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);
  return fs.readFileSync(filename, binary ? undefined : 'utf8');
};

readBinary = (filename) => {
  var ret = read_(filename, true);
  if (!ret.buffer) {
    ret = new Uint8Array(ret);
  }
#if ASSERTIONS
  assert(ret.buffer);
#endif
  return ret;
};

readAsync = (filename, onload, onerror) => {
#if SUPPORT_BASE64_EMBEDDING
  var ret = tryParseAsDataURI(filename);
  if (ret) {
    onload(ret);
  }
#endif
  // See the comment in the `read_` function.
  filename = isFileURI(filename) ? new URL(filename) : nodePath.normalize(filename);
  fs.readFile(filename, function(err, data) {
    if (err) onerror(err);
    else onload(data.buffer);
  });
};