export declare const isBrowser: boolean;
export declare function createSVGElement(type: string): SVGElement;
export declare function getScale($el: HTMLCanvasElement): {
    scaleX: number;
    scaleY: number;
    bbox: DOMRect;
};
/**
 * Safely parses a URL string without throwing exceptions on invalid input.
 * Returns a URL object for valid URLs or undefined for invalid ones.
 *
 * @param url - The URL string to parse
 * @param baseUrl - Optional base URL to resolve relative URLs against
 * @returns A URL object if parsing succeeds, undefined if it fails
 *
 * @example
 * ```ts
 * // Valid absolute URL
 * const url1 = safeParseUrl('https://example.com')
 * if (url1) {
 *   console.log(`Valid URL: ${url1.href}`) // "Valid URL: https://example.com/"
 * }
 *
 * // Invalid URL
 * const url2 = safeParseUrl('not-a-url')
 * console.log(url2) // undefined
 *
 * // Relative URL with base
 * const url3 = safeParseUrl('/path', 'https://example.com')
 * if (url3) {
 *   console.log(url3.href) // "https://example.com/path"
 * }
 *
 * // Error handling
 * function handleUserUrl(input: string) {
 *   const url = safeParseUrl(input)
 *   if (url) {
 *     return url
 *   } else {
 *     console.log('Invalid URL provided')
 *     return null
 *   }
 * }
 * ```
 *
 * @public
 */
export declare const safeParseUrl: (url: string, baseUrl?: string | URL) => URL;
export declare const getSandboxPermissions: (permissions: TLEmbedShapePermissions) => string;
type TLEmbedShapePermissions = {
    [K in keyof typeof embedShapePermissionDefaults]?: boolean;
};
/**
 * Permissions with note inline from
 * https://developer.mozilla.org/en-US/docs/Web/HTML/Element/iframe#attr-sandbox
 *
 * @see https://github.com/tldraw/tldraw/blob/main/packages/tldraw/src/lib/defaultEmbedDefinitions.ts#L606
 */
export declare const embedShapePermissionDefaults: {
    readonly 'allow-downloads-without-user-activation': false;
    readonly 'allow-downloads': false;
    readonly 'allow-modals': false;
    readonly 'allow-orientation-lock': false;
    readonly 'allow-pointer-lock': false;
    readonly 'allow-popups': true;
    readonly 'allow-popups-to-escape-sandbox': false;
    readonly 'allow-presentation': false;
    readonly 'allow-storage-access-by-user-activation': false;
    readonly 'allow-top-navigation': false;
    readonly 'allow-top-navigation-by-user-activation': false;
    readonly 'allow-scripts': true;
    readonly 'allow-same-origin': true;
    readonly 'allow-forms': true;
};
export {};