How to use the @pixi/display.Container.prototype function in @pixi/display

import { Container } from '@pixi/display';

/**
 * To be overridden by the subclass
 * @method _renderCanvas
 * @memberof PIXI.Container#
 * @protected
 * @param {PIXI.CanvasRenderer} renderer - The renderer
 */
Container.prototype._renderCanvas = function _renderCanvas(renderer) // eslint-disable-line no-unused-vars
{
    // this is where content itself gets rendered...
};

/**
 * Renders the object using the Canvas renderer
 * @method renderCanvas
 * @memberof PIXI.Container#
 * @param {PIXI.CanvasRenderer} renderer - The renderer
 */
Container.prototype.renderCanvas = function renderCanvas(renderer)
{
    // if not visible or the alpha is 0 then no need to render this
    if (!this.visible || this.worldAlpha <= 0 || !this.renderable)
    {
        return;

* @memberof PIXI.Container#
 * @protected
 * @param {PIXI.CanvasRenderer} renderer - The renderer
 */
Container.prototype._renderCanvas = function _renderCanvas(renderer) // eslint-disable-line no-unused-vars
{
    // this is where content itself gets rendered...
};

/**
 * Renders the object using the Canvas renderer
 * @method renderCanvas
 * @memberof PIXI.Container#
 * @param {PIXI.CanvasRenderer} renderer - The renderer
 */
Container.prototype.renderCanvas = function renderCanvas(renderer)
{
    // if not visible or the alpha is 0 then no need to render this
    if (!this.visible || this.worldAlpha <= 0 || !this.renderable)
    {
        return;
    }

    if (this._mask)
    {
        renderer.maskManager.pushMask(this._mask);
    }

    this._renderCanvas(renderer);
    for (let i = 0, j = this.children.length; i < j; ++i)
    {
        this.children[i].renderCanvas(renderer);

* The instance name of the object.
 *
 * @memberof PIXI.DisplayObject#
 * @member {string} name
 */
DisplayObject.prototype.name = null;

/**
 * Returns the display object in the container.
 *
 * @method getChildByName
 * @memberof PIXI.Container#
 * @param {string} name - Instance name.
 * @return {PIXI.DisplayObject} The child with the specified name.
 */
Container.prototype.getChildByName = function getChildByName(name)
{
    for (let i = 0; i < this.children.length; i++)
    {
        if (this.children[i].name === name)
        {
            return this.children[i];
        }
    }

    return null;
};