/**
 * True for a word that's already an ALL-CAPS acronym (2+ letters, e.g.
 * 'API', 'HTML5') -- both styles leave these exactly as written rather
 * than lowercasing or capitalizing them. Non-letter characters (digits)
 * don't count toward the length or case check.
 */
export declare function isAllCapsWord(word: string): boolean;
/** The `v2` of `v2.0`, or `v3`. The `v` must be the whole alphabetic part,
 *  so an ordinary word like `vector3` is untouched. */
export declare function isVersionToken(word: string): boolean;
/** `x-metadata`, `x-codeSamples`. Case-sensitive: matching `X-` too would
 *  freeze `X-ray` and AWS `X-Ray`. */
export declare function isVendorExtensionToken(word: string): boolean;
/** Tokens whose own casing is already correct. Must be checked before
 *  hyphen splitting -- an extension's `-` is part of its name. */
export declare function keepsOwnCasing(word: string): boolean;
export interface ExceptionPlan {
    wordMap: Map<string, string>;
    phrases: string[];
}
export declare function buildExceptionPlan(exceptions: string[]): ExceptionPlan;
/**
 * Rebuilds `text` with every word re-cased by `caseWord`, which receives the
 * word, its `index`, the sequence `total`, and whether it opens a sentence.
 * Separators are copied through verbatim.
 *
 * Phrase-exception and mask tokens are emitted as-written but still OCCUPY an
 * index, so a leading one cannot hand position 0 to a neighbour (#25610).
 *
 * Shared by apTitleCase/chicagoTitleCase and capitalization.ts's sentenceCase.
 * Length-preserving whenever `caseWord` is.
 */
export declare function recaseWords(text: string, phrases: string[], caseWord: (word: string, index: number, total: number, startsSentence: boolean) => string): string;
/**
 * AP style: lowercases articles, coordinating conjunctions, and
 * prepositions of 3 letters or fewer -- everything else is capitalized,
 * except `exceptions` (kept as-written) and ALL-CAPS words (left alone).
 * The first and last word are always capitalized.
 */
export declare function apTitleCase(text: string, exceptions?: string[]): string;
/**
 * Chicago style: like AP, but lowercases EVERY preposition regardless of
 * length (not just the 3-letters-or-fewer ones AP lowercases).
 */
export declare function chicagoTitleCase(text: string, exceptions?: string[]): string;
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