var path = require('path')
    , fs = require('fs')
    , existsSync = fs.existsSync || path.existsSync; // node <=0.6


exports.resolve = function (p, exts) {
    if (existsSync(p)) { return p; }

    if (!exts) {
        exts = Object.keys(require.extensions).map(function (ext) { return ext; });
    } else if ('string' == typeof exts) {
        exts = [exts];
    }

    var ext, f;
    for (var i = 0, len = exts.length; i < len; ++i) {
        ext = exts[i];
        if ('.' != ext[0]) { ext = '.' + ext; }
        f = p + ext;
        if (existsSync(f)) { return f; }
    }

    return p + '.js';
};