/**
 * Creates a message for extension project prompt based on the provided parameters.
 *
 * @param {boolean} isApplicationSupported - Whether the selected application is supported.
 * @param {boolean} hasSyncViews - Whether synchronized views exist for the app.
 * @param {string} [errorMessage] - Optional validation error message (only used in BAS).
 * @returns {string} A message for confirm extension project prompt.
 */
export declare const getExtProjectMessage: (isApplicationSupported: boolean, hasSyncViews: boolean, errorMessage?: string) => string;
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