utils.js
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utils.js
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	/**
	* Utils used by RecentChanges Filters.
	*
	* @namespace rcfilters.utils
	* @private
	*/
	module.exports = {
	/**
	* @param {Node[]} arr
	* @param {Node[]\|Node} elements
	* @return {Node[]}
	*/
	addArrayElementsUnique: function ( arr, elements ) {
	elements = Array.isArray( elements ) ? elements : [ elements ];

	elements.forEach( ( element ) => {
	if ( arr.indexOf( element ) === -1 ) {
	arr.push( element );
	}
	} );

	return arr;
	},
	/**
	* @param {string[]} givenOptions
	* @param {string[]} legalOptions
	* @param {boolean} [supportsAll] defaults to true.
	* @return {string[]}
	*/
	normalizeParamOptions: function ( givenOptions, legalOptions, supportsAll ) {
	const result = [];
	supportsAll = supportsAll === undefined ? true : !!supportsAll;

	if ( supportsAll && givenOptions.indexOf( 'all' ) > -1 ) {
	// If anywhere in the values there's 'all', we
	// treat it as if only 'all' was selected.
	// Example: param=valid1,valid2,all
	// Result: param=all
	return [ 'all' ];
	}

	// Get rid of any dupe and invalid parameter, only output
	// valid ones
	// Example: param=valid1,valid2,invalid1,valid1
	// Result: param=valid1,valid2
	givenOptions.forEach( ( value ) => {
	if (
	legalOptions.indexOf( value ) > -1 &&
	result.indexOf( value ) === -1
	) {
	result.push( value );
	}
	} );

	return result;
	}
	};