export declare const embedIframeBlockMarkdownAdapterMatcher: import("@blocksuite/affine-shared/adapters").BlockMarkdownAdapterMatcher;
export declare const EmbedIframeBlockMarkdownAdapterExtension: import("@blocksuite/store").ExtensionType & {
    identifier: import("@blocksuite/global/di").ServiceIdentifier<import("@blocksuite/affine-shared/adapters").BlockMarkdownAdapterMatcher>;
};
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