/**
 * Shared helpers for parsing route path params and constraints.
 * @internal
 */
/** Validates whether a character can start a route param name. @internal */
export declare const isParamStart: (char: string | undefined) => boolean;
/** Validates whether a character can appear after the start of a route param name. @internal */
export declare const isParamChar: (char: string | undefined) => boolean;
/** Reads a route param constraint while preserving escaped chars and nested groups. @internal */
export declare const readConstraint: (path: string, startIndex: number) => {
    constraint: string;
    endIndex: number;
} | null;
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