static defineElement()

in resources/perf.webkit.org/public/v3/components/base.js [206:250]
36 lines of code
5 McCabe index (conditional complexity)

    static defineElement(name, elementInterface)
    {
        ComponentBase._componentByName.set(name, elementInterface);
        ComponentBase._componentByClass.set(elementInterface, name);

        const enqueueToRenderOnResize = elementInterface.enqueueToRenderOnResize;

        if (!ComponentBase.useNativeCustomElements)
            return;

        class elementClass extends HTMLElement {
            constructor()
            {
                super();

                const currentlyConstructed = ComponentBase._currentlyConstructedByInterface;
                const component = currentlyConstructed.get(elementInterface);
                if (component)
                    return; // ComponentBase's constructor will take care of the rest.

                currentlyConstructed.set(elementInterface, this);
                new elementInterface();
                currentlyConstructed.delete(elementInterface);
            }

            connectedCallback()
            {
                this.component().enqueueToRender();
                if (enqueueToRenderOnResize)
                    ComponentBase._connectedComponentToRenderOnResize(this.component());
            }

            disconnectedCallback()
            {
                if (enqueueToRenderOnResize)
                    ComponentBase._disconnectedComponentToRenderOnResize(this.component());
            }
        }

        const nameDescriptor = Object.getOwnPropertyDescriptor(elementClass, 'name');
        nameDescriptor.value = `${elementInterface.name}Element`;
        Object.defineProperty(elementClass, 'name', nameDescriptor);

        customElements.define(name, elementClass);
    }