/**
 * Returns true when an href is safe to pass to a real browser navigation
 * (e.g. `window.location.assign`). Blocks scripted/inline schemes that could
 * execute in the session-bearing webview. Relative URLs and http(s)/mailto/tel
 * are allowed. Promoted from staffbase-alerts.
 * @param {string} href - The href to validate.
 * @returns {boolean} True when the href is safe to navigate to.
 */
export declare const isSafeNavigationHref: (href: string) => boolean;
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