/**
 * Create an error message block
 * @param dom The DOM on which dom.createElement will be called
 * @param err The error message string to display (or an error object)
 * @param backgroundColor Background color. Default: '#fee'
 * @param err2 Is the second param is a string, you can put the original Error in here
 * @returns A div element with the err string
 *
 * This will return a DOM element you can put in the UI as a notice for the user
 *  Meanwhile the stack is dumped to the console for the developer, so you actually know
 *  where it happened!
 */
export declare function errorMessageBlock(dom: HTMLDocument, err: string | Error, backgroundColor?: string, err2?: Error): HTMLDivElement;
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