/**
 * Convert legacy blocks to their canonical form. This function is used
 * both in the parser level for previous content and to convert such blocks
 * used in Custom Post Types templates.
 *
 * @param name       The block's name
 * @param attributes The block's attributes
 *
 * @return The block's name and attributes, changed accordingly if a match was found
 */
export declare function convertLegacyBlockNameAndAttributes(name: string | undefined | null, attributes: Record<string, unknown>): [string | undefined | null, Record<string, unknown>];
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