@boost/config/src/helpers/mergeArray.ts

Powerful convention based finder, loader, and manager of both configuration and ignore files.

/**
 * Merges previous and next arrays into a new array while removing duplicates (using `Set`).
 */
export function mergeArray<T extends unknown[]>(prev: T, next: T): T {
	return [...new Set([...prev, ...next])].filter((value) => value !== undefined) as T;
}