type OptionType = 'bool' | 'triple' | 'number' | 'string' | 'novar';
export interface OptionSpec {
    /** Short flag letter; the upper-case letter selects a triple's
     *  second state. Empty for long-only options. */
    letter: string;
    /** Long names; an uppercase name selects a triple's second state. */
    names: string[];
    type: OptionType;
    /** State/toggle messages indexed by the option state. */
    messages: string[];
    /** Parameter prompt for number/string options. */
    prompt?: string;
    /** Report template for number/string options (%d / %s). */
    report?: string;
    /** Replaces the parameter prompt with a dedicated flow (-o, -O). */
    enter?: () => void;
    /** Negative numbers allowed (O_NEGOK). */
    negok?: boolean;
    /** Cannot be changed at runtime (O_NO_TOGGLE). */
    noToggle?: boolean;
    /** Ignored by the $LESS scan, set via $LESS_UNSUPPORT (O_UNSUPPORTED). */
    unsupported?: boolean;
    /** Cannot be queried with `_` (O_NO_QUERY). */
    noQuery?: boolean;
    /** Custom `_` query, for handlers with combined-state messages. */
    query?: () => void;
    /** Runs after a number value applies at INIT or TOGGLE, like an
     *  optfunc handler; less skips it for a two-argument pendopt value. */
    handler?: () => void;
    /** Number options: largest accepted value and the reset fallback. */
    max?: number;
    maxMessage?: string;
    maxFallback?: number;
    /** String options: characters valid in a $LESS parameter, like
     *  opttbl.c's odesc[1] ("s" space-ends, "d" digits, "," lists,
     *  leading "-"/"." allowed); unset reads to `$` or end. */
    validchars?: string;
    defaultValue: number | string;
    get: () => number | string;
    set: (value: number | string, content: string[]) => void;
}
export {};