/**
 * Notation serialization shared by the two breakdown builders — the
 * evaluator's `expression`/`rendered` strings and `render.ts`.
 *
 * @module notation
 */
/**
 * Appends a modifier code to the expression built so far, separating the two
 * with a space when concatenating them would re-lex as a single identifier.
 * The space is the same separator the input used to make them parse.
 */
export declare function joinModifierCode(expression: string, code: string): string;
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