How to use the @ckeditor/ckeditor5-utils/src/isiterable function in @ckeditor/ckeditor5-utils

function normalize( nodes ) {
	// Separate condition because string is iterable.
	if ( typeof nodes == 'string' ) {
		return [ new Text( nodes ) ];
	}

	if ( !isIterable( nodes ) ) {
		nodes = [ nodes ];
	}

	// Array.from to enable .map() on non-arrays.
	return Array.from( nodes )
		.map( node => {
			if ( typeof node == 'string' ) {
				return new Text( node );
			}

			if ( node instanceof TextProxy ) {
				return new Text( node.data, node.getAttributes() );
			}

			return node;
		} );

function normalize( nodes ) {
	// Separate condition because string is iterable.
	if ( typeof nodes == 'string' ) {
		return [ new Text( nodes ) ];
	}

	if ( !isIterable( nodes ) ) {
		nodes = [ nodes ];
	}

	// Array.from to enable .map() on non-arrays.
	return Array.from( nodes )
		.map( node => {
			if ( typeof node == 'string' ) {
				return new Text( node );
			}

			if ( node instanceof TextProxy ) {
				return new Text( node.data );
			}

			return node;
		} );

function normalize( nodes ) {
	// Separate condition because string is iterable.
	if ( typeof nodes == 'string' ) {
		return [ new Text( nodes ) ];
	}

	if ( !isIterable( nodes ) ) {
		nodes = [ nodes ];
	}

	// Array.from to enable .map() on non-arrays.
	return Array.from( nodes )
		.map( node => {
			if ( typeof node == 'string' ) {
				return new Text( node );
			}

			if ( node instanceof TextProxy ) {
				return new Text( node.data, node.getAttributes() );
			}

			return node;
		} );

function normalize( nodes ) {
	// Separate condition because string is iterable.
	if ( typeof nodes == 'string' ) {
		return [ new Text( nodes ) ];
	}

	if ( !isIterable( nodes ) ) {
		nodes = [ nodes ];
	}

	// Array.from to enable .map() on non-arrays.
	return Array.from( nodes )
		.map( node => {
			return typeof node == 'string' ? new Text( node ) : node;
		} );
}

range = new Range( Position._createAt( selectable, placeOrOffset ) );
			} else {
				/**
				 * selection.setTo requires the second parameter when the first parameter is a node.
				 *
				 * @error model-selection-setTo-required-second-parameter
				 */
				throw new CKEditorError(
					'model-selection-setTo-required-second-parameter: ' +
					'selection.setTo requires the second parameter when the first parameter is a node.',
					[ this, selectable ]
				);
			}

			this._setRanges( [ range ], backward );
		} else if ( isIterable( selectable ) ) {
			// We assume that the selectable is an iterable of ranges.
			this._setRanges( selectable, placeOrOffset && !!placeOrOffset.backward );
		} else {
			/**
			 * Cannot set the selection to the given place.
			 *
			 * Invalid parameters were specified when setting the selection. Common issues:
			 *
			 * * A {@link module:engine/model/textproxy~TextProxy} instance was passed instead of
			 * a real {@link module:engine/model/text~Text}.
			 * * View nodes were passed instead of model nodes.
			 * * `null`/`undefined` was passed.
			 *
			 * @error model-selection-setTo-not-selectable
			 */
			throw new CKEditorError(

insert( position, nodes ) {
		nodes = isIterable( nodes ) ? [ ...nodes ] : [ nodes ];

		// Check if nodes to insert are instances of AttributeElements, ContainerElements, EmptyElements, UIElements or Text.
		validateNodesToInsert( nodes, this.document );

		const container = getParentContainer( position );

		if ( !container ) {
			/**
			 * Position's parent container cannot be found.
			 *
			 * @error view-writer-invalid-position-container
			 */
			throw new CKEditorError( 'view-writer-invalid-position-container', this.document );
		}

		const insertionPosition = this._breakAttributes( position, true );

insert( position, nodes ) {
		nodes = isIterable( nodes ) ? [ ...nodes ] : [ nodes ];

		// Check if nodes to insert are instances of AttributeElements, ContainerElements, EmptyElements, UIElements or Text.
		validateNodesToInsert( nodes, this.document );

		const container = getParentContainer( position );

		if ( !container ) {
			/**
			 * Position's parent container cannot be found.
			 *
			 * @error view-writer-invalid-position-container
			 */
			throw new CKEditorError( 'view-writer-invalid-position-container', this.document );
		}

		const insertionPosition = this._breakAttributes( position, true );