export interface GenericVSCodeWrapper<TWebviewMessage, TExtensionMessage> {
    postMessage(message: TWebviewMessage): void;
    onMessage(callback: (message: TExtensionMessage) => void): () => void;
    getState(): unknown;
    setState(newState: unknown): void;
}
/**
 * Create a proxy function for use in the webview that "calls" a function in the extension host
 * (which must be a message defined in {@link WebviewMessage}) and returns a promise for the result
 * (which must be a message defined in {@link ExtensionMessage}).
 *
 * @template TWebviewMessage The webview protocol (such as {@link WebviewMessage}).
 * @template TExtensionMessage The extension host protocol (such as {@link ExtensionMessage}).
 */
export declare function createExtensionAPIProxyInWebview<TWebviewMessage extends {
    command: string;
}, TExtensionMessage extends {
    type: string;
}, TRequestName extends TWebviewMessage['command'], TResponseName extends TExtensionMessage['type']>(api: GenericVSCodeWrapper<TWebviewMessage, TExtensionMessage>, requestName: TRequestName, responseName: TResponseName): (params: Omit<Extract<TWebviewMessage, {
    command: TRequestName;
}>, 'command'>) => Promise<Omit<Extract<TExtensionMessage, {
    type: TResponseName;
}>, 'type'>>;
export interface GenericWebviewAPIWrapper<TWebviewMessage, TExtensionMessage> {
    postMessage(message: TExtensionMessage): void;
    postError(error: Error): void;
    onMessage(callback: (message: TWebviewMessage) => void): () => void;
}
/**
 * Create a handler for use in the extension host that responds to "calls" from a webview proxy
 * function created by {@link createExtensionAPIProxyInWebview}.
 *
 * @template TWebviewMessage The webview protocol (such as {@link WebviewMessage}).
 * @template TExtensionMessage The extension host protocol (such as {@link ExtensionMessage}).
 */
export declare function handleExtensionAPICallFromWebview<TWebviewMessage extends {
    command: string;
}, TExtensionMessage extends {
    type: string;
}, TRequestName extends TWebviewMessage['command'], TResponseName extends TExtensionMessage['type']>(api: GenericWebviewAPIWrapper<TWebviewMessage, TExtensionMessage>, requestName: TRequestName, responseName: TResponseName, handler: (params: Omit<Extract<TWebviewMessage, {
    command: TRequestName;
}>, 'command'>) => Promise<Omit<Extract<TExtensionMessage, {
    type: TResponseName;
}>, 'type'>>): {
    dispose: () => void;
};
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