import { type DashStyle } from "./dashes.js";
import { type PunctuationStyle } from "./quotes.js";
export interface TransformOptions {
    /**
     * Whether to include symbol transforms (ellipsis, multiplication, etc.)
     * Default: true
     */
    symbols?: boolean;
    /**
     * Whether to collapse multiple consecutive spaces (including non-breaking
     * spaces) into a single space. Keeps the first space in the sequence.
     * Runs at the start of a line (after `\n` or start-of-string) are preserved
     * so indented blocks (e.g. HN-style code) survive.
     *
     * - `true` (default): "hello  world" → "hello world"; "  indented" → "  indented"
     * - `false`: Preserve multiple spaces
     *
     * Default: true
     */
    collapseSpaces?: boolean;
    /**
     * How to handle quotes and punctuation placement.
     *
     * - `"american"` (default): Chicago style. Converts straight quotes to smart
     *   quotes, converts prime marks, and places periods/commas inside quotes.
     *   Example: "Hello." and "Hello,"
     * - `"british"`: Oxford style. Converts straight quotes to smart quotes,
     *   converts prime marks, and places periods/commas outside quotes.
     *   Example: "Hello". and "Hello",
     * - `"german"`: German style. Uses low-9 quote characters: „..." and ‚...'
     *   (U+201E/U+201C double, U+201A/U+2018 single). Punctuation outside quotes.
     * - `"french"`: French style. Uses guillemets with NNBSP padding: «\u202F...\u202F»
     *   Single quotes remain as curly quotes. Punctuation outside quotes.
     * - `"none"`: Skip all quote and punctuation transforms entirely.
     *   Straight quotes, apostrophes, and prime marks are left unmodified.
     *
     * Default: "american"
     */
    punctuationStyle?: PunctuationStyle;
    /**
     * How to style dashes.
     *
     * - `"american"` (default): Chicago style. Converts parenthetical dashes to
     *   unspaced em dashes (word—word), number ranges to en dashes (1–5),
     *   date ranges to en dashes (January–March), and hyphens to minus signs (−5).
     * - `"british"`: Oxford style. Converts parenthetical dashes to spaced en
     *   dashes (word – word), with the same number range, date range, and minus
     *   sign conversions.
     * - `"none"`: Skip all dash transforms entirely. Hyphens, number ranges,
     *   date ranges, and minus signs are left unmodified.
     *
     * Default: "american"
     */
    dashStyle?: DashStyle;
    /**
     * Whether to include fraction transforms (1/2 → ½)
     * Default: false (can be aggressive)
     */
    fractions?: boolean;
    /**
     * Whether to include degree symbol transforms (20 C → 20 °C)
     * Default: false (can be aggressive)
     */
    degrees?: boolean;
    /**
     * Whether to convert ordinal suffixes to Unicode superscript characters.
     * Transforms numbers like "1st", "2nd", "3rd", "4th" to "1ˢᵗ", "2ⁿᵈ", "3ʳᵈ", "4ᵗʰ".
     * Default: false
     */
    superscript?: boolean;
    /**
     * Whether to convert repeated punctuation marks to Unicode ligature characters.
     * Squashes multiple marks: "???" → "⁇", "?!" → "⁈", "!?" → "⁉", "!!!" → "!"
     * Default: false (poor font support)
     */
    ligatures?: boolean;
    /**
     * Whether to include arrow transforms (-> → →, <- → ←, <-> → ↔).
     * Only applies when `symbols` is true.
     * Default: true
     */
    includeArrows?: boolean;
    /**
     * Whether to insert non-breaking spaces in typographically appropriate
     * locations (after short words, between numbers and units, before
     * last words to prevent widows, after honorifics, etc.).
     * Default: true
     */
    nbsp?: boolean;
}
/** Runtime list of valid `transform()` option keys, derived from the option
 * defaults so it cannot drift from {@link TransformOptions}. */
export declare const TRANSFORM_OPTION_KEYS: readonly string[];
export type ResolvedTransformOptions = Required<TransformOptions>;
/** Validates `options` and fills in the defaults. */
export declare function resolveTransformOptions(options: TransformOptions): ResolvedTransformOptions;
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