@babylonjs/core/Misc/deepMerger.js

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// https://stackoverflow.com/a/48218209
/**
 * Merges a series of objects into a single object, deeply.
 * @param objects The objects to merge (objects later in the list take precedence).
 * @returns The merged object.
 */
export function deepMerge(...objects) {
    const isRecord = (obj) => !!obj && typeof obj === "object";
    return objects.reduce((prev, obj) => {
        const keys = Object.keys(obj);
        for (const key of keys) {
            const pVal = prev[key];
            const oVal = obj[key];
            if (Array.isArray(pVal) && Array.isArray(oVal)) {
                prev[key] = pVal.concat(...oVal);
            }
            else if (isRecord(pVal) && isRecord(oVal)) {
                prev[key] = deepMerge(pVal, oVal);
            }
            else {
                prev[key] = oVal;
            }
        }
        return prev;
    }, {});
}
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