Change: imported modules are not resolved relative to current dir.

Change: imported modules are not resolved relative to current dir.

Previously, when a module was imported with a relative path
it was looked for first in the directory of the importing context
(global, or a module).

For example when:
    main.js:
        import libs/lib1.js;

    libs/lib1.js:
        import lib2.js;

lib2.js was looked for first in libs/.

Now, it is only looked for in directories speficied with js_path
and a directory of nginx configuration file.