misskey-awawa/packages/backend/src/misc/normalize-for-search.ts

export function normalizeForSearch(tag: string): string {
	// ref.
	// - https://analytics-note.xyz/programming/unicode-normalization-forms/
	// - https://maku77.github.io/js/string/normalize.html
	return tag.normalize('NFKC').toLowerCase();
}