jscodeshift to replace depedencies module import with local module import

depedencyToLocalTransform.js

import { parse } from 'path';

/**
 * Search for 
 * 
 *   import ... from 'mydependency'; 
 * 
 * And replace with a relative import:
 *
 *   import ... from '.../mydependency';
 * 
 * Following example works on a 'lib' folder and go back in folder tree to import a lib/mylocalmodule.js file.
 * Example, in lib/sub/folder/file.js replaces:
 *
 *   import m from 'mydependency';
 *
 * With:
 *
 *   import m from '../../mylocalmodule';
 * 
 * Run with: jscodeshift -t depedencyToLocalTransform.js lib
 */
module.exports = function (file, api) {
  const j = api.jscodeshift;

  const { dir } = parse(file.path);
  const levels = String(dir).split('/').length - 1; // - 1 should vary depending mylocalmodule.js location
  let newPath = 'mylocalmodule';
  for (let i = 1; i <= levels; i += 1) {
    newPath = `../${newPath}`;
  }

  return j(file.source)
    .find(j.ImportDeclaration, { source: { type: 'Literal', value: 'mydependency' } })
    .forEach((path) => {
      const { node } = path;
      node.source = `'${newPath}'`;
      return node;
    })
    .toSource();
};