Function getElementsTreeOperations

src/inject/utils/dom.ts:286–324

(mutations: MutationRecord[])

}

function getElementsTreeOperations(mutations: MutationRecord[]): ElementsTreeOperations {
    const additions = new Set<Element>();
    const deletions = new Set<Element>();
    const moves = new Set<Element>();
    mutations.forEach((m) => {
        forEach(m.addedNodes, (n) => {
            if (n instanceof Element && n.isConnected) {
                additions.add(n);
            }
        });
        forEach(m.removedNodes, (n) => {
            if (n instanceof Element) {
                if (n.isConnected) {
                    moves.add(n);
                    additions.delete(n);
                } else {
                    deletions.add(n);
                }
            }
        });
    });

    const duplicateAdditions: Element[] = [];
    const duplicateDeletions: Element[] = [];
    additions.forEach((node) => {
        if (additions.has(node.parentElement as HTMLElement)) {
            duplicateAdditions.push(node);
        }
    });
    deletions.forEach((node) => {
        if (deletions.has(node.parentElement as HTMLElement)) {
            duplicateDeletions.push(node);
        }
    });
    duplicateAdditions.forEach((node) => additions.delete(node));
    duplicateDeletions.forEach((node) => deletions.delete(node));

    return {additions, moves, deletions};
}

interface OptimizedTreeObserverCallbacks {
    onMinorMutations: (root: Document | ShadowRoot, operations: ElementsTreeOperations) => void;