init.js
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init.js
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	mw.hook( 'wikiEditor.toolbarReady' ).add( function ( $textarea ) {

	// Guard against this module being loaded for non-wikitext pages.
	// This is already done in Hooks.php but Realtime Preview can also be loaded as a gadget so this is necessary.
	if ( mw.config.get( 'wgPageContentModel' ) !== 'wikitext' ) {
	return;
	}

	var RealtimePreview = require( './RealtimePreview.js' );
	var realtimePreview = new RealtimePreview();
	$textarea.wikiEditor( 'addToToolbar', {
	section: 'secondary',
	group: 'default',
	tools: {
	realtimepreview: {
	type: 'element',
	element: function ( context ) {
	return realtimePreview.getToolbarButton( context );
	}
	}
	}
	} );
	if ( realtimePreview.getUserPref() && realtimePreview.isScreenWideEnough() ) {
	realtimePreview.setEnabled();
	mw.hook( 'ext.WikiEditor.realtimepreview.inuse' ).fire( this );
	}
	} );