@visactor/vrender-core/es/common/inversify/annotation/optional.js

```typescript import { xxx } from '@visactor/vrender-core'; ```

import { Metadata } from "../meta-data";

import { OPTIONAL_TAG } from "../metadata_keys";

import { createTaggedDecorator } from "./inject_base";

function optional() {
    return createTaggedDecorator(new Metadata(OPTIONAL_TAG, !0));
}

export { optional };
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