getNestedObjectKeyNames.ts

/**
 * Returns an array with the names of the keys of an object.
 * Supports nested objects.
 *
 * @example
 * getObjectKeyNames({
 *   some: {
 *     nested: {
 *       value: 'string'
 *     }
 *   },
 *   normalValue: 'string'
 * })
 *
 * Returns: ['some.nested.value', 'normalValue']
 */
export const getNestedObjectKeyNames = (
	object: Record<string, any>
): string[] => {
	let keyNames: string[] = []

	for (const key in object) {
		// If the value for the key is an object, repeat the process for that nested object
		if (typeof object[key] === 'object') {
			const nestedKeyNames = getNestedObjectKeyNames(object[key]).map(
				(nestedKey) => `${key}.${nestedKey}`
			)
			keyNames = [...keyNames, ...nestedKeyNames]
		} else {
			keyNames.push(key)
		}
	}

	return keyNames
}