@typescript-eslint/utils/dist/eslint-utils/deepMerge.js

Utilities for working with TypeScript + ESLint together

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isObjectNotArray = isObjectNotArray;
exports.deepMerge = deepMerge;
/**
 * Check if the variable contains an object strictly rejecting arrays
 * @returns `true` if obj is an object
 */
function isObjectNotArray(obj) {
    return typeof obj === 'object' && obj != null && !Array.isArray(obj);
}
/**
 * Pure function - doesn't mutate either parameter!
 * Merges two objects together deeply, overwriting the properties in first with the properties in second
 * @param first The first object
 * @param second The second object
 * @returns a new object
 */
function deepMerge(first = {}, second = {}) {
    // get the unique set of keys across both objects
    const keys = new Set([...Object.keys(first), ...Object.keys(second)]);
    return Object.fromEntries([...keys].map(key => {
        const firstHasKey = key in first;
        const secondHasKey = key in second;
        const firstValue = first[key];
        const secondValue = second[key];
        let value;
        if (firstHasKey && secondHasKey) {
            if (isObjectNotArray(firstValue) && isObjectNotArray(secondValue)) {
                // object type
                value = deepMerge(firstValue, secondValue);
            }
            else {
                // value type
                value = secondValue;
            }
        }
        else if (firstHasKey) {
            value = firstValue;
        }
        else {
            value = secondValue;
        }
        return [key, value];
    }));
}