Did you follow the Installation instruction before executing composer?
The de...

Did you follow the Installation instruction before executing composer?
The dependency bower-asset/jquery-ui-daterangepicker:^0.5 is pulled in from Asset Packagist.

Ref: https://github.com/drupal-composer/drupal-project/issues/278#issuecommen...
Please do the following:

1. Execute composer require oomphinc/composer-installers-extender
2. Edit your project's composer.json file as follows:
   1. Add the Asset Packagist repository to the "repositories" section: "repositories": [ ... { "type": "composer", "url": "https://asset-packagist.org" } ],

   2. Add "installer-types" and update "installer-paths" in the "extra" section:

   "extra": { ... "installer-types": ["npm-asset", "bower-asset"], "installer-paths": { ... "web/libraries/{$name}": ["type:drupal-library", "type:npm-asset", "type:bower-asset"], ... } ... }
3. Execute composer require 'drupal/daterangepickerwidget:^1.0@alpha'