61 lines
1.6 KiB
JavaScript
61 lines
1.6 KiB
JavaScript
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/**
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* @fileoverview Applies default rule options
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* @author JoshuaKGoldberg
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*/
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"use strict";
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/**
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* Check if the variable contains an object strictly rejecting arrays
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* @param {unknown} value an object
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* @returns {boolean} Whether value is an object
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*/
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function isObjectNotArray(value) {
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return typeof value === "object" && value !== null && !Array.isArray(value);
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}
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/**
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* Deeply merges second on top of first, creating a new {} object if needed.
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* @param {T} first Base, default value.
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* @param {U} second User-specified value.
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* @returns {T | U | (T & U)} Merged equivalent of second on top of first.
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*/
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function deepMergeObjects(first, second) {
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if (second === void 0) {
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return first;
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}
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if (!isObjectNotArray(first) || !isObjectNotArray(second)) {
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return second;
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}
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const result = { ...first, ...second };
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for (const key of Object.keys(second)) {
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if (Object.prototype.propertyIsEnumerable.call(first, key)) {
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result[key] = deepMergeObjects(first[key], second[key]);
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}
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}
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return result;
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}
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/**
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* Deeply merges second on top of first, creating a new [] array if needed.
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* @param {T[]} first Base, default values.
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* @param {U[]} second User-specified values.
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* @returns {(T | U | (T & U))[]} Merged equivalent of second on top of first.
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*/
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function deepMergeArrays(first, second) {
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if (!first || !second) {
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return second || first || [];
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}
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return [
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...first.map((value, i) => deepMergeObjects(value, i < second.length ? second[i] : void 0)),
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...second.slice(first.length)
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];
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}
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module.exports = { deepMergeArrays };
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