MediaWiki:Vector.js

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// Throw an exception on https://test2.wikipedia.org/w/index.php?title=Sandbox&oldid=281475
// This is for testing with `window.onerror` and `mw.trackSubscribe('global.error')`
if ( mw.config.get( 'wgPageName' ) === 'Sandbox' ) {
  mw.hook( 'wikipage.content' ).add(function ( $content ) {
    var $err = $content.find( 'div.errorbox[data-throw]' );
    if ( $err.length ) {
      setTimeout( function () {
        throw new Error( $err.text() );
      } );
    }
  } );
}