Function loadSource

lib/internal/modules/cjs/loader.js:1959–1987

* Get the source code of a module, using cached ones if it's cached. This is used * for TypeScript, JavaScript and JSON loading. * After this returns, mod[kFormat], mod[kModuleSource] and mod[kURL] will be set. * @param {Module} mod Module instance whose source is potentially already cached. * @

(mod, filename, formatFromNode)

 * @returns {{source: string, format?: string}}
 */
function loadSource(mod, filename, formatFromNode) {
  if (mod[kFormat] === undefined) {
    mod[kFormat] = formatFromNode;
  }
  // If the module was loaded before, just return.
  if (mod[kModuleSource] !== undefined) {
    return { source: mod[kModuleSource], format: mod[kFormat] };
  }

  // Fast path: no hooks, just load it and return.
  if (!loadHooks.length) {
    const source = defaultLoadImpl(filename, formatFromNode);
    return { source, format: formatFromNode };
  }

  if (mod[kURL] === undefined) {
    mod[kURL] = convertCJSFilenameToURL(filename);
  }

  const defaultLoad = getDefaultLoad(mod[kURL], filename);
  const loadResult = loadWithHooks(mod[kURL], mod[kFormat], /* importAttributes */ undefined,
                                   getCjsConditionsArray(), defaultLoad, validateLoadStrict);
  // Reset the module properties with load hook results.
  if (loadResult.format !== undefined) {
    mod[kFormat] = loadResult.format;
  }
  mod[kModuleSource] = loadResult.source;
  return { source: mod[kModuleSource], format: mod[kFormat] };
}

function reconstructErrorStack(err, parentPath, parentSource) {
  const errLine = StringPrototypeSplit(