| 1 | import { isSome } from './helpers.js';
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| 2 | export function mergeDeep(sources, respectPrototype = false) {
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| 3 | const target = sources[0] || {};
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| 4 | const output = {};
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| 5 | if (respectPrototype) {
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| 6 | Object.setPrototypeOf(output, Object.create(Object.getPrototypeOf(target)));
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| 7 | }
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| 8 | for (const source of sources) {
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| 9 | if (isObject(target) && isObject(source)) {
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| 10 | if (respectPrototype) {
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| 11 | const outputPrototype = Object.getPrototypeOf(output);
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| 12 | const sourcePrototype = Object.getPrototypeOf(source);
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| 13 | if (sourcePrototype) {
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| 14 | for (const key of Object.getOwnPropertyNames(sourcePrototype)) {
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| 15 | const descriptor = Object.getOwnPropertyDescriptor(sourcePrototype, key);
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| 16 | if (isSome(descriptor)) {
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| 17 | Object.defineProperty(outputPrototype, key, descriptor);
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| 18 | }
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| 19 | }
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| 20 | }
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| 21 | }
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| 22 | for (const key in source) {
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| 23 | if (isObject(source[key])) {
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| 24 | if (!(key in output)) {
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| 25 | Object.assign(output, { [key]: source[key] });
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| 26 | }
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| 27 | else {
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| 28 | output[key] = mergeDeep([output[key], source[key]], respectPrototype);
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| 29 | }
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| 30 | }
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| 31 | else {
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| 32 | Object.assign(output, { [key]: source[key] });
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| 33 | }
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| 34 | }
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| 35 | }
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| 36 | }
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| 37 | return output;
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| 38 | }
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| 39 | function isObject(item) {
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| 40 | return item && typeof item === 'object' && !Array.isArray(item);
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| 41 | }
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