| 1 | 'use strict';
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| 2 | const {URL} = require('url');
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| 3 | const is = require('@sindresorhus/is');
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| 4 |
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| 5 | const merge = (target, ...sources) => {
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| 6 | for (const source of sources) {
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| 7 | for (const [key, sourceValue] of Object.entries(source)) {
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| 8 | if (is.undefined(sourceValue)) {
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| 9 | continue;
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| 10 | }
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| 11 |
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| 12 | const targetValue = target[key];
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| 13 | if (is.urlInstance(targetValue) && (is.urlInstance(sourceValue) || is.string(sourceValue))) {
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| 14 | target[key] = new URL(sourceValue, targetValue);
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| 15 | } else if (is.plainObject(sourceValue)) {
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| 16 | if (is.plainObject(targetValue)) {
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| 17 | target[key] = merge({}, targetValue, sourceValue);
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| 18 | } else {
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| 19 | target[key] = merge({}, sourceValue);
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| 20 | }
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| 21 | } else if (is.array(sourceValue)) {
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| 22 | target[key] = merge([], sourceValue);
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| 23 | } else {
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| 24 | target[key] = sourceValue;
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| 25 | }
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| 26 | }
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| 27 | }
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| 28 |
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| 29 | return target;
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| 30 | };
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| 31 |
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| 32 | module.exports = merge;
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