First commit.

Signed-off-by: Chen Xiao <abigwc@gmail.com>

client/node_modules/langium/lib/lsp/hover-provider.d.ts

@@ -0,0 +1,40 @@
+/******************************************************************************
+ * Copyright 2021 TypeFox GmbH
+ * This program and the accompanying materials are made available under the
+ * terms of the MIT License, which is available in the project root.
+ ******************************************************************************/
+import type { Hover, HoverParams } from 'vscode-languageserver';
+import type { CancellationToken } from '../utils/cancellation.js';
+import type { GrammarConfig } from '../languages/grammar-config.js';
+import type { References } from '../references/references.js';
+import type { LangiumServices } from './lsp-services.js';
+import type { AstNode } from '../syntax-tree.js';
+import type { MaybePromise } from '../utils/promise-utils.js';
+import type { LangiumDocument } from '../workspace/documents.js';
+import type { DocumentationProvider } from '../documentation/documentation-provider.js';
+/**
+ * Language-specific service for handling hover requests.
+ */
+export interface HoverProvider {
+    /**
+     * Handle a hover request.
+     *
+     * @throws `OperationCancelled` if cancellation is detected during execution
+     * @throws `ResponseError` if an error is detected that should be sent as response to the client
+     */
+    getHoverContent(document: LangiumDocument, params: HoverParams, cancelToken?: CancellationToken): MaybePromise<Hover | undefined>;
+}
+export declare abstract class AstNodeHoverProvider implements HoverProvider {
+    protected readonly references: References;
+    protected readonly grammarConfig: GrammarConfig;
+    constructor(services: LangiumServices);
+    getHoverContent(document: LangiumDocument, params: HoverParams): Promise<Hover | undefined>;
+    protected abstract getAstNodeHoverContent(node: AstNode): MaybePromise<string | undefined>;
+    protected getKeywordHoverContent(node: AstNode): MaybePromise<Hover | undefined>;
+}
+export declare class MultilineCommentHoverProvider extends AstNodeHoverProvider {
+    protected readonly documentationProvider: DocumentationProvider;
+    constructor(services: LangiumServices);
+    protected getAstNodeHoverContent(node: AstNode): MaybePromise<string | undefined>;
+}
+//# sourceMappingURL=hover-provider.d.ts.map