src/vs/workbench/api/common/extHostLanguageFeatures.ts/InlineCompletionAdapter/supportsHandleDidShowCompletionItem
class InlineCompletionAdapter:	public get supportsHandleDidShowCompletionItem(): boolean {
		return isProposedApiEnabled(this._extension, 'inlineCompletionsAdditions') && typeof this._provider.handleDidShowCompletionItem === 'function';
	}