@afwenming123/vue-easy-tree/src/components/utils/merge.js

A Vue.js project

export default function(target) {
    for (let i = 1, j = arguments.length; i < j; i++) {
        let source = arguments[i] || {};
        for (let prop in source) {
            // eslint-disable-next-line no-prototype-builtins
            if (source.hasOwnProperty(prop)) {
                let value = source[prop];
                if (value !== undefined) {
                    target[prop] = value;
                }
            }
        }
    }

    return target;
}