1 | function isObject(val) {
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2 | return val !== null && typeof val === "object";
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3 | }
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4 | function _defu(baseObj, defaults, namespace = ".", merger) {
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5 | if (!isObject(defaults)) {
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6 | return _defu(baseObj, {}, namespace, merger);
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7 | }
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8 | const obj = Object.assign({}, defaults);
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9 | for (const key in baseObj) {
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10 | if (key === "__proto__" || key === "constructor") {
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11 | continue;
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12 | }
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13 | const val = baseObj[key];
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14 | if (val === null) {
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15 | continue;
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16 | }
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17 | if (merger && merger(obj, key, val, namespace)) {
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18 | continue;
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19 | }
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20 | if (Array.isArray(val) && Array.isArray(obj[key])) {
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21 | obj[key] = obj[key].concat(val);
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22 | } else if (isObject(val) && isObject(obj[key])) {
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23 | obj[key] = _defu(val, obj[key], (namespace ? `${namespace}.` : "") + key.toString(), merger);
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24 | } else {
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25 | obj[key] = val;
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26 | }
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27 | }
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28 | return obj;
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29 | }
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30 | function extend(merger) {
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31 | return (...args) => args.reduce((p, c) => _defu(p, c, "", merger), {});
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32 | }
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33 | const defu = extend();
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34 | defu.fn = extend((obj, key, currentValue, _namespace) => {
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35 | if (typeof obj[key] !== "undefined" && typeof currentValue === "function") {
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36 | obj[key] = currentValue(obj[key]);
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37 | return true;
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38 | }
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39 | });
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40 | defu.arrayFn = extend((obj, key, currentValue, _namespace) => {
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41 | if (Array.isArray(obj[key]) && typeof currentValue === "function") {
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42 | obj[key] = currentValue(obj[key]);
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43 | return true;
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44 | }
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45 | });
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46 | defu.extend = extend;
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47 |
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48 | export default defu;
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