import { KMXPlus, VisualKeyboard } from "@keymanapp/common-types";
import { CompilerCallbacks } from "@keymanapp/developer-utils";
export declare class LdmlKeyboardVisualKeyboardCompiler {
    private callbacks;
    constructor(callbacks: CompilerCallbacks);
    /**
     * Generate a visual keyboard
     * @param source      Compiled KMX+ data; note that this is modified to add
     *                    &VISUALKEYBOARD system store on success
     * @param keyboardId  Basename of keyboard, without file extension
     * @returns           Visual keyboard data on success, null on failure, or
     *                    false if no VK was generated for this keyboard
     */
    compile(source: KMXPlus.KMXPlusData, keyboardId: string): VisualKeyboard.VisualKeyboard | boolean | null;
    private compileHardwareLayer;
    private getDisplayFromKey;
    private translateLayerModifiersToVisualKeyboardShift;
}
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