@coursebuilder/core/src/lib/utils/merge.ts

Core package for Course Builder

// Source: https://stackoverflow.com/a/34749873/5364135

/** Simple object check */
function isObject(item: any): boolean {
	return item && typeof item === 'object' && !Array.isArray(item)
}

/** Deep merge two objects */
export function merge(target: any, ...sources: any[]): any {
	if (!sources.length) return target
	const source = sources.shift()

	if (isObject(target) && isObject(source)) {
		for (const key in source) {
			if (isObject(source[key])) {
				if (!target[key]) Object.assign(target, { [key]: {} })
				merge(target[key], source[key])
			} else {
				Object.assign(target, { [key]: source[key] })
			}
		}
	}

	return merge(target, ...sources)
}