@cornerstonejs/core/dist/esm/utilities/deepClone.js

Cornerstone3D Core

export function deepClone(value) {
    if (typeof structuredClone === 'function') {
        try {
            return structuredClone(value);
        }
        catch {
        }
    }
    return cloneValue(value, new WeakMap());
}
function cloneValue(value, seen) {
    if (value === null || typeof value !== 'object') {
        return value;
    }
    const existingClone = seen.get(value);
    if (existingClone) {
        return existingClone;
    }
    if (value instanceof Date) {
        return new Date(value.getTime());
    }
    if (value instanceof Map) {
        const clonedMap = new Map();
        seen.set(value, clonedMap);
        value.forEach((mapValue, mapKey) => {
            clonedMap.set(cloneValue(mapKey, seen), cloneValue(mapValue, seen));
        });
        return clonedMap;
    }
    if (value instanceof Set) {
        const clonedSet = new Set();
        seen.set(value, clonedSet);
        value.forEach((setValue) => {
            clonedSet.add(cloneValue(setValue, seen));
        });
        return clonedSet;
    }
    if (Array.isArray(value)) {
        const clonedArray = [];
        seen.set(value, clonedArray);
        value.forEach((item, index) => {
            clonedArray[index] = cloneValue(item, seen);
        });
        return clonedArray;
    }
    const clonedObject = {};
    seen.set(value, clonedObject);
    Reflect.ownKeys(value).forEach((key) => {
        clonedObject[key] = cloneValue(value[key], seen);
    });
    return clonedObject;
}