Fix experimental typing in meta model (#983)

Author: dbaeumer

protocol/metaModel.json

@@ -8355,7 +8355,7 @@
 					"name": "experimental",
 					"type": {
 						"kind": "reference",
-						"name": "T"
+						"name": "LSPAny"
 					},
 					"optional": true,
 					"documentation": "Experimental server capabilities."

protocol/src/common/protocol.ts

@@ -961,7 +961,7 @@ export interface ClientCapabilities {
 	/**
 	 * Experimental client capabilities.
 	 */
-	experimental?: object;
+	experimental?: LSPAny;
 }
 
 /**
@@ -1042,7 +1042,7 @@ export namespace WorkDoneProgressOptions {
  * Defines the capabilities provided by a language
  * server.
  */
-export interface ServerCapabilities<T = any> {
+export interface ServerCapabilities<T = LSPAny> {
 
 	/**
 	 * The position encoding the server picked from the encodings offered

tools/src/visitor.ts

@@ -948,7 +948,10 @@ export default class Visitor {
 			if (typeInfo === undefined) {
 				throw new Error(`Can't parse property ${member.getName()} of structure ${symbol.getName()}`);
 			}
-			const property: Property = { name: member.getName(), type: TypeInfo.asJsonType(typeInfo) };
+
+			const property: Property = (result.name === 'ServerCapabilities' && member.getName() === 'experimental' && typeInfo.kind === 'reference' && typeInfo.name === 'T')
+				? { name: member.getName(), type: TypeInfo.asJsonType({ kind: 'reference', name: 'LSPAny', symbol: typeInfo.symbol }) }
+				: { name: member.getName(), type: TypeInfo.asJsonType(typeInfo) };
 			if (Symbols.isOptional(member)) {
 				property.optional = true;
 			}