Function normalizePath

src/utils/path.ts:12–38

(path: string, relativize = true)

 * @returns the converted path
 */
export const normalizePath = (path: string, relativize = true): string => {
  if (typeof path !== 'string') {
    throw new Error(`invalid path to normalize`);
  }
  path = normalizeSlashes(path.trim());

  const components = pathComponents(path, getRootLength(path));
  const reducedComponents = reducePathComponents(components);
  const rootPart = reducedComponents[0];
  const secondPart = reducedComponents[1];
  const normalized = rootPart + reducedComponents.slice(1).join('/');

  if (normalized === '') {
    return '.';
  }
  if (
    rootPart === '' &&
    secondPart &&
    path.includes('/') &&
    !secondPart.startsWith('.') &&
    !secondPart.startsWith('@') &&
    relativize
  ) {
    return './' + normalized;
  }
  return normalized;
};

const normalizeSlashes = (path: string) => path.replace(backslashRegExp, '/');