motion-dom/dist/es/stats/index.mjs

import { statsBuffer } from './buffer.mjs';

/**
 * The metrics projection counts, in the order of the index it passes to
 * statsBuffer.countProjection.
 */
const projectionMetrics = [
    "nodes",
    "calculatedTargetDeltas",
    "calculatedProjections",
];
function clearStatsBuffer() {
    statsBuffer.value = null;
    statsBuffer.addProjectionMetrics = null;
    statsBuffer.countProjection = undefined;
}
function recordStats() {
    if (statsBuffer.value) {
        clearStatsBuffer();
        throw new Error("Stats are already being measured");
    }
    const buffer = statsBuffer;
    buffer.value = {
        layoutProjection: {
            nodes: [],
            calculatedTargetDeltas: [],
            calculatedProjections: [],
        },
    };
    buffer.addProjectionMetrics = (metrics) => {
        const { layoutProjection } = buffer.value;
        layoutProjection.nodes.push(metrics.nodes);
        layoutProjection.calculatedTargetDeltas.push(metrics.calculatedTargetDeltas);
        layoutProjection.calculatedProjections.push(metrics.calculatedProjections);
    };
    /**
     * Counting lives here rather than in projection, so bundles that never
     * call recordStats() don't ship it.
     */
    const metrics = {
        nodes: 0,
        calculatedTargetDeltas: 0,
        calculatedProjections: 0,
    };
    buffer.countProjection = (metric) => {
        if (metric !== undefined) {
            metrics[projectionMetrics[metric]]++;
        }
        else {
            buffer.addProjectionMetrics(metrics);
            metrics.nodes =
                metrics.calculatedTargetDeltas =
                    metrics.calculatedProjections =
                        0;
        }
    };
}

export { recordStats };
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