/**
 * Registers plugin UI strings into {@link AcApI18n}.
 *
 * Safe to call multiple times; subsequent calls are no-ops.
 */
export declare function acuiRegisterSimpleUiI18n(): void;
/**
 * Scoped translation helper for plugin UI strings under the `simpleUi` namespace.
 */
export declare class AcUiI18n {
    /**
     * Translates a key relative to the `simpleUi` namespace.
     *
     * @param key - Message key without the `simpleUi.` prefix (for example `toolbar.select`).
     * @param params - Optional `{name}` placeholder replacements.
     * @returns Translated string, or the key when no translation exists.
     */
    t(key: string, params?: Record<string, string>): string;
}
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