@uifabric/utilities/lib/merge.js

/**
 * Simple deep merge function. Takes all arguments and returns a deep copy of the objects merged
 * together in the order provided. If an object creates a circular reference, it will assign the
 * original reference.
 */
export function merge(target) {
    var args = [];
    for (var _i = 1; _i < arguments.length; _i++) {
        args[_i - 1] = arguments[_i];
    }
    for (var _a = 0, args_1 = args; _a < args_1.length; _a++) {
        var arg = args_1[_a];
        _merge(target || {}, arg);
    }
    return target;
}
/**
 * The _merge helper iterates through all props on source and assigns them to target.
 * When the value is an object, we will create a deep clone of the object. However if
 * there is a circular reference, the value will not be deep cloned and will persist
 * the reference.
 */
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function _merge(target, source, circularReferences) {
    if (circularReferences === void 0) { circularReferences = []; }
    circularReferences.push(source);
    for (var name_1 in source) {
        if (source.hasOwnProperty(name_1)) {
            if (name_1 !== '__proto__' && name_1 !== 'constructor' && name_1 !== 'prototype') {
                var value = source[name_1];
                if (typeof value === 'object' && value !== null && !Array.isArray(value)) {
                    var isCircularReference = circularReferences.indexOf(value) > -1;
                    target[name_1] = (isCircularReference
                        ? value
                        : _merge(target[name_1] || {}, value, circularReferences));
                }
                else {
                    target[name_1] = value;
                }
            }
        }
    }
    circularReferences.pop();
    return target;
}
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