Function getRequireESMError

lib/internal/modules/cjs/loader.js:2010–2033

* Generate the legacy ERR_REQUIRE_ESM for the cases where require(esm) is disabled. * @param {Module} mod The module being required. * @param {undefined|object} pkg Data of the nearest package.json of the module. * @param {string} content Source code of the module. * @param {string} filename Fil

(mod, pkg, content, filename)

 * @returns {Error}
 */
function getRequireESMError(mod, pkg, content, filename) {
  // This is an error path because `require` of a `.js` file in a `"type": "module"` scope is not allowed.
  const parent = mod[kFirstModuleParent];
  const parentPath = parent?.filename;
  const packageJsonPath = pkg?.path;
  const usesEsm = containsModuleSyntax(content, filename);
  const err = new ERR_REQUIRE_ESM(filename, usesEsm, parentPath,
                                  packageJsonPath);
  // Attempt to reconstruct the parent require frame.
  const parentModule = Module._cache[parentPath];
  if (parentModule) {
    let parentSource;
    try {
      ({ source: parentSource } = loadSource(parentModule, parentPath));
    } catch {
      // Continue regardless of error.
    }
    if (parentSource) {
      // TODO(joyeecheung): trim off internal frames from the stack.
      reconstructErrorStack(err, parentPath, parentSource);
    }
  }
  return err;
}

/**
 * Built-in handler for `.js` files.