File renderer.js has 469 lines of code (exceeds 250 allowed). Consider refactoring.

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/**
 * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.
 * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
 */

Renderer has 23 functions (exceeds 20 allowed). Consider refactoring.

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export default class Renderer {
    /**
     * Creates a renderer instance.
     *
     * @param {module:engine/view/domconverter~DomConverter} domConverter Converter instance.

Function render has a Cognitive Complexity of 16 (exceeds 5 allowed). Consider refactoring.

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    render() {
        let inlineFillerPosition;

        // Refresh mappings.
        for ( const element of this.markedChildren ) {

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Function render has 41 lines of code (exceeds 25 allowed). Consider refactoring.

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    render() {
        let inlineFillerPosition;

        // Refresh mappings.
        for ( const element of this.markedChildren ) {

Function _updateChildren has a Cognitive Complexity of 13 (exceeds 5 allowed). Consider refactoring.

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    _updateChildren( viewElement, options ) {
        const domElement = this.domConverter.mapViewToDom( viewElement );

        if ( !domElement ) {
            // If there is no `domElement` it means that it was already removed from DOM.

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Function _updateChildren has 38 lines of code (exceeds 25 allowed). Consider refactoring.

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    _updateChildren( viewElement, options ) {
        const domElement = this.domConverter.mapViewToDom( viewElement );

        if ( !domElement ) {
            // If there is no `domElement` it means that it was already removed from DOM.

Function _updateChildrenMappings has a Cognitive Complexity of 12 (exceeds 5 allowed). Consider refactoring.

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    _updateChildrenMappings( viewElement ) {
        const domElement = this.domConverter.mapViewToDom( viewElement );

        if ( !domElement ) {
            // If there is no `domElement` it means that it was already removed from DOM and there is no need to process it.

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Function markToSync has a Cognitive Complexity of 10 (exceeds 5 allowed). Consider refactoring.

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    markToSync( type, node ) {
        if ( type === 'text' ) {
            if ( this.domConverter.mapViewToDom( node.parent ) ) {
                this.markedTexts.add( node );
            }

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Function _updateChildrenMappings has 27 lines of code (exceeds 25 allowed). Consider refactoring.

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    _updateChildrenMappings( viewElement ) {
        const domElement = this.domConverter.mapViewToDom( viewElement );

        if ( !domElement ) {
            // If there is no `domElement` it means that it was already removed from DOM and there is no need to process it.

Function _updateText has a Cognitive Complexity of 9 (exceeds 5 allowed). Consider refactoring.

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    _updateText( viewText, options ) {
        const domText = this.domConverter.findCorrespondingDomText( viewText );
        const newDomText = this.domConverter.viewToDom( viewText, domText.ownerDocument );

        const actualText = domText.data;

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Function _needsInlineFillerAtSelection has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.

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    _needsInlineFillerAtSelection() {
        if ( this.selection.rangeCount != 1 || !this.selection.isCollapsed ) {
            return false;
        }

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Function _findReplaceActions has a Cognitive Complexity of 7 (exceeds 5 allowed). Consider refactoring.

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    _findReplaceActions( actions, actualDom, expectedDom ) {
        // If there is no both 'insert' and 'delete' actions, no need to check for replaced elements.
        if ( actions.indexOf( 'insert' ) === -1 || actions.indexOf( 'delete' ) === -1 ) {
            return actions;
        }

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Avoid too many return statements within this function.

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            return false;

Avoid too many return statements within this function.

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            return false;

Avoid too many return statements within this function.

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        return true;

Function _markDescendantTextToSync has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.

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    _markDescendantTextToSync( viewNode ) {
        if ( !viewNode ) {
            return;
        }

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Function _removeDomSelection has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.

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    _removeDomSelection() {
        for ( const doc of this.domDocuments ) {
            const domSelection = doc.getSelection();

            if ( domSelection.rangeCount ) {

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Function addInlineFiller has a Cognitive Complexity of 6 (exceeds 5 allowed). Consider refactoring.

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function addInlineFiller( domDocument, domParentOrArray, offset ) {
    const childNodes = domParentOrArray instanceof Array ? domParentOrArray : domParentOrArray.childNodes;
    const nodeAfterFiller = childNodes[ offset ];

    if ( isText( nodeAfterFiller ) ) {

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