Why can't import BlockAddedMutationType

[tcper]

When you use import EditorJS, {BlockAddedMutationType} from '@editorjs/editorjs';

You will get this error: SyntaxError: The requested module '/node_modules/.vite/deps/@editorjs_editorjs.js?v=03c9909b' does not provide an export named 'BlockAddedMutationType' (at Editor.vue:7:1)

But in VSCode, ctrl+click could jump to export file, and shows BlockAddedMutationType exported And after tries, I found this works: import EditorJS, {type OutputData} from '@editorjs/editorjs';

So, what magic behind this ? editorjs hope we use it or otherwise?