/**
 * Substitute strings placed between square brackets into value defined in `variables` object. String names defined in
 * square brackets must be the same as property name of `variables` object.
 *
 * Lives in its own module, not in `helpers/string`, so that `helpers/console` can use it without
 * importing `helpers/string` — `helpers/string` needs `deprecatedWarnOnce` from `helpers/console`,
 * and the resulting cycle would leave one of the two modules reading an uninitialized binding.
 *
 * @param {string} template Template string.
 * @param {object} variables Object which contains all available values which can be injected into template.
 * @returns {string}
 */
export declare function substitute(template: string, variables?: Record<string, unknown>): string;