support 'deprecated'

src/jsonSchema.ts

@@ -58,6 +58,7 @@ export interface JSONSchema {
 	unevaluatedItems?: boolean | JSONSchemaRef;
 	minContains?: number;
 	maxContains?: number;
+	deprecated?: boolean;
 
 	// schema 2020-12
 	prefixItems?: JSONSchemaRef[];

src/parser/jsonParser.ts

@@ -554,11 +554,13 @@ function validate(n: ASTNode | undefined, schema: JSONSchema, validationResult:
 			validationResult.enumValues = [schema.const];
 		}
 
-		if (schema.deprecationMessage && node.parent) {
+		let deprecationMessage = schema.deprecationMessage;
+		if ((deprecationMessage || schema.deprecated) && node.parent) {
+			deprecationMessage = deprecationMessage || localize('deprecated', 'Value is deprecated');
 			validationResult.problems.push({
 				location: { offset: node.parent.offset, length: node.parent.length },
 				severity: DiagnosticSeverity.Warning,
-				message: schema.deprecationMessage,
+				message: deprecationMessage,
 				code: ErrorCode.Deprecated
 			});
 		}

src/test/parser.test.ts

@@ -2269,9 +2269,7 @@ suite('JSON Parser', () => {
 
 	test('deprecated', function () {
 
-		const { textDoc, jsonDoc } = toDocument('{"prop": 42}');
-
-		const schema: JSONSchema = {
+		let schema: JSONSchema = {
 			type: 'object',
 			properties: {
 				'prop': {
@@ -2279,10 +2277,26 @@ suite('JSON Parser', () => {
 				}
 			}
 		};
+		{
+			const { textDoc, jsonDoc } = toDocument('{"prop": 42}');
+			const semanticErrors = jsonDoc.validate(textDoc, schema);
+			assert.strictEqual(semanticErrors!.length, 1);
+		}
 
-		const semanticErrors = jsonDoc.validate(textDoc, schema);
+		schema = {
+			type: 'object',
+			properties: {
+				'prop': {
+					deprecated: true
+				}
+			}
+		};
+		{
+			const { textDoc, jsonDoc } = toDocument('{"prop": 42}');
+			const semanticErrors = jsonDoc.validate(textDoc, schema);
+			assert.strictEqual(semanticErrors!.length, 1);
+		}
 
-		assert.strictEqual(semanticErrors!.length, 1);
 	});
 
 	test('Strings with spaces', function () {