/** Coerces entries to strings, trims them, and drops empty results. */
export declare function normalizeStringEntries(list?: ReadonlyArray<unknown>): string[];
/** Normalizes string entries and lowercases each retained value. */
export declare function normalizeStringEntriesLower(list?: ReadonlyArray<unknown>): string[];
/** Returns first-seen unique values while preserving insertion order. */
export declare function uniqueValues<T>(values: Iterable<T>): T[];
/** Returns first-seen unique strings while preserving insertion order. */
export declare function uniqueStrings(values: Iterable<string>): string[];
/** Returns unique strings sorted with stable ASCII comparison. */
export declare function sortUniqueStrings(values: Iterable<string>): string[];
/** Normalizes entries, removes duplicates, and preserves first-seen order. */
export declare function normalizeUniqueStringEntries(values?: Iterable<unknown>): string[];
/** Lowercases normalized entries, removes empties/duplicates, and preserves first-seen order. */
export declare function normalizeUniqueStringEntriesLower(values?: Iterable<unknown>): string[];
/** Normalizes entries, removes duplicates, and returns sorted output. */
export declare function normalizeSortedUniqueStringEntries(values?: Iterable<unknown>): string[];
/** Normalizes array-backed string lists and rejects non-array input as empty. */
export declare function normalizeTrimmedStringList(value: unknown): string[];
/** Normalizes an array-backed string list and removes duplicates. */
export declare function normalizeUniqueTrimmedStringList(value: unknown): string[];
/** Normalizes an array-backed string list, removes duplicates, and sorts it. */
export declare function normalizeSortedUniqueTrimmedStringList(value: unknown): string[];
/** Returns undefined instead of an empty normalized array-backed string list. */
export declare function normalizeOptionalTrimmedStringList(value: unknown): string[] | undefined;
/** Returns undefined for non-arrays but preserves an empty array for explicit arrays. */
export declare function normalizeArrayBackedTrimmedStringList(value: unknown): string[] | undefined;
/** Normalizes either a single string-like value or an array-backed string list. */
export declare function normalizeSingleOrTrimmedStringList(value: unknown): string[];
/** Normalizes single-or-array string input and removes duplicates. */
export declare function normalizeUniqueSingleOrTrimmedStringList(value: unknown): string[];
/** Parses either array entries or comma-separated string entries into trimmed values. */
export declare function normalizeCsvOrLooseStringList(value: unknown): string[];
/** Normalizes user-facing names into permissive lowercase slugs that may keep #/@/._+. */
export declare function normalizeHyphenSlug(raw?: string | null): string;
/** Normalizes @/#-prefixed channel names into strict lowercase hyphen slugs without the prefix. */
export declare function normalizeAtHashSlug(raw?: string | null): string;