rvx/dist/es/test/assert-view-state.js

A signal based rendering library

import { ENV } from "../core/env.js";
import { View } from "../core/view.js";
export function assertViewState(view) {
    if (!(view instanceof View)) {
        throw new Error("view is not a View");
    }
    const env = ENV.current;
    if (!(view.first instanceof env.Node)) {
        throw new Error("view.first is not a Node");
    }
    if (!(view.last instanceof env.Node)) {
        throw new Error("view.last is not a Node");
    }
    if (view.first !== view.last) {
        const parent = view.first.parentNode;
        if (!(parent instanceof env.Node)) {
            throw new Error("view.first.parent is not a Node");
        }
        let node = view.first.nextSibling;
        nodes: for (;;) {
            if (node === null) {
                throw new Error("view is unterminated");
            }
            if (!(node instanceof env.Node)) {
                throw new Error("view contains non-Node");
            }
            if (node === view.last) {
                break nodes;
            }
            node = node.nextSibling;
        }
    }
}
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