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diff --git a/‎src/compiler/checker.ts
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+1-1Lines changed: 1 addition & 1 deletion b/‎src/compiler/checker.ts
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+1-1Lines changed: 1 addition & 1 deletion
diff --git a/‎src/compiler/debug.ts
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+2-1Lines changed: 2 additions & 1 deletion b/‎src/compiler/debug.ts
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+2-1Lines changed: 2 additions & 1 deletion
diff --git a/‎src/compiler/factory/nodeFactory.ts
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+28-28Lines changed: 28 additions & 28 deletions b/‎src/compiler/factory/nodeFactory.ts
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+28-28Lines changed: 28 additions & 28 deletions
@@ -44030,7 +44030,7 @@ namespace ts {
         }
 
         function checkGrammarDecorators(node: Node): boolean {
-            if (canHaveIllegalDecorators(node) && some(node.decorators)) {
+            if (canHaveIllegalDecorators(node) && some(node.illegalDecorators)) {
                 return grammarErrorOnFirstToken(node, Diagnostics.Decorators_are_not_valid_here);
             }
             if (!canHaveDecorators(node) || !hasDecorators(node)) {
 
@@ -30,6 +30,7 @@ namespace ts {
         export let currentLogLevel = LogLevel.Warning;
         export let isDebugging = false;
         export let loggingHost: LoggingHost | undefined;
+        export let enableDeprecationWarnings = true;
         /* eslint-enable prefer-const */
 
         type AssertionKeys = MatchingKeys<typeof Debug, AnyFunction>;
@@ -732,7 +733,7 @@ namespace ts {
         function createWarningDeprecation(name: string, errorAfter: Version | undefined, since: Version | undefined, message: string | undefined) {
             let hasWrittenDeprecation = false;
             return () => {
-                if (!hasWrittenDeprecation) {
+                if (enableDeprecationWarnings && !hasWrittenDeprecation) {
                     log.warn(formatDeprecationMessage(name, /*error*/ false, errorAfter, since, message));
                     hasWrittenDeprecation = true;
                 }
 
@@ -1435,7 +1435,7 @@ namespace ts {
             node.transformFlags = propagateChildFlags(body) | TransformFlags.ContainsClassFields;
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             node.modifiers = undefined;
             return node;
         }
@@ -1452,7 +1452,7 @@ namespace ts {
 
         function finishUpdateClassStaticBlockDeclaration(updated: Mutable<ClassStaticBlockDeclaration>, original: ClassStaticBlockDeclaration) {
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
                 updated.modifiers = original.modifiers;
             }
             return update(updated, original);
@@ -1476,7 +1476,7 @@ namespace ts {
             node.transformFlags |= TransformFlags.ContainsES2015;
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             node.typeParameters = undefined;
             node.type = undefined;
             return node;
@@ -1498,7 +1498,7 @@ namespace ts {
 
         function finishUpdateConstructorDeclaration(updated: Mutable<ConstructorDeclaration>, original: ConstructorDeclaration) {
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
                 updated.typeParameters = original.typeParameters;
                 updated.type = original.type;
             }
@@ -3657,7 +3657,7 @@ namespace ts {
             }
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             return node;
         }
 
@@ -3686,7 +3686,7 @@ namespace ts {
         function finishUpdateFunctionDeclaration(updated: Mutable<FunctionDeclaration>, original: FunctionDeclaration) {
             if (updated !== original) {
                 // copy children used only for error reporting
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
             }
             return finishUpdateBaseSignatureDeclaration(updated, original);
         }
@@ -3756,7 +3756,7 @@ namespace ts {
             node.transformFlags = TransformFlags.ContainsTypeScript;
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             return node;
         }
 
@@ -3780,7 +3780,7 @@ namespace ts {
 
         function finishUpdateInterfaceDeclaration(updated: Mutable<InterfaceDeclaration>, original: InterfaceDeclaration) {
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
             }
             return update(updated, original);
         }
@@ -3802,7 +3802,7 @@ namespace ts {
             node.transformFlags = TransformFlags.ContainsTypeScript;
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             return node;
         }
 
@@ -3824,7 +3824,7 @@ namespace ts {
 
         function finishUpdateTypeAliasDeclaration(updated: Mutable<TypeAliasDeclaration>, original: TypeAliasDeclaration) {
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
             }
             return update(updated, original);
         }
@@ -3847,7 +3847,7 @@ namespace ts {
             node.transformFlags &= ~TransformFlags.ContainsPossibleTopLevelAwait; // Enum declarations cannot contain `await`
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             return node;
         }
 
@@ -3866,7 +3866,7 @@ namespace ts {
 
         function finishUpdateEnumDeclaration(updated: Mutable<EnumDeclaration>, original: EnumDeclaration) {
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
             }
             return update(updated, original);
         }
@@ -3896,7 +3896,7 @@ namespace ts {
             node.transformFlags &= ~TransformFlags.ContainsPossibleTopLevelAwait; // Module declarations cannot contain `await`.
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             return node;
         }
 
@@ -3916,7 +3916,7 @@ namespace ts {
 
         function finishUpdateModuleDeclaration(updated: Mutable<ModuleDeclaration>, original: ModuleDeclaration) {
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
             }
             return update(updated, original);
         }
@@ -3961,7 +3961,7 @@ namespace ts {
             node.transformFlags = TransformFlags.ContainsTypeScript;
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             node.modifiers = undefined;
             return node;
         }
@@ -3975,7 +3975,7 @@ namespace ts {
 
         function finishUpdateNamespaceExportDeclaration(updated: Mutable<NamespaceExportDeclaration>, original: NamespaceExportDeclaration) {
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
                 updated.modifiers = original.modifiers;
             }
             return update(updated, original);
@@ -4000,7 +4000,7 @@ namespace ts {
             node.transformFlags &= ~TransformFlags.ContainsPossibleTopLevelAwait; // Import= declaration is always parsed in an Await context
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             return node;
         }
 
@@ -4022,7 +4022,7 @@ namespace ts {
 
         function finishUpdateImportEqualsDeclaration(updated: Mutable<ImportEqualsDeclaration>, original: ImportEqualsDeclaration) {
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
             }
             return update(updated, original);
         }
@@ -4045,7 +4045,7 @@ namespace ts {
             node.transformFlags &= ~TransformFlags.ContainsPossibleTopLevelAwait; // always parsed in an Await context
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             return node;
         }
 
@@ -4067,7 +4067,7 @@ namespace ts {
 
         function finishUpdateImportDeclaration(updated: Mutable<ImportDeclaration>, original: ImportDeclaration) {
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
             }
             return update(updated, original);
         }
@@ -4235,7 +4235,7 @@ namespace ts {
             node.transformFlags &= ~TransformFlags.ContainsPossibleTopLevelAwait; // always parsed in an Await context
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             return node;
         }
 
@@ -4253,7 +4253,7 @@ namespace ts {
 
         function finishUpdateExportAssignment(updated: Mutable<ExportAssignment>, original: ExportAssignment) {
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
             }
             return update(updated, original);
         }
@@ -4279,7 +4279,7 @@ namespace ts {
             node.transformFlags &= ~TransformFlags.ContainsPossibleTopLevelAwait; // always parsed in an Await context
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             return node;
         }
 
@@ -4303,7 +4303,7 @@ namespace ts {
 
         function finishUpdateExportDeclaration(updated: Mutable<ExportDeclaration>, original: ExportDeclaration) {
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
             }
             return update(updated, original);
         }
@@ -5162,7 +5162,7 @@ namespace ts {
                 propagateChildFlags(node.initializer);
 
             // The following properties are used only to report grammar errors
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             node.modifiers = undefined;
             node.questionToken = undefined;
             node.exclamationToken = undefined;
@@ -5180,7 +5180,7 @@ namespace ts {
         function finishUpdatePropertyAssignment(updated: Mutable<PropertyAssignment>, original: PropertyAssignment) {
             // copy children used only for error reporting
             if (updated !== original) {
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
                 updated.modifiers = original.modifiers;
                 updated.questionToken = original.questionToken;
                 updated.exclamationToken = original.exclamationToken;
@@ -5202,7 +5202,7 @@ namespace ts {
 
             // The following properties are used only to report grammar errors
             node.equalsToken = undefined;
-            node.decorators = undefined;
+            node.illegalDecorators = undefined;
             node.modifiers = undefined;
             node.questionToken = undefined;
             node.exclamationToken = undefined;
@@ -5221,7 +5221,7 @@ namespace ts {
             if (updated !== original) {
                 // copy children used only for error reporting
                 updated.equalsToken = original.equalsToken;
-                updated.decorators = original.decorators;
+                updated.illegalDecorators = original.illegalDecorators;
                 updated.modifiers = original.modifiers;
                 updated.questionToken = original.questionToken;
                 updated.exclamationToken = original.exclamationToken;
Original file line number	Diff line number	Diff line change
`@@ -44030,7 +44030,7 @@ namespace ts {`
`44030`	`44030`	`}`
`44031`	`44031`
`44032`	`44032`	`function checkGrammarDecorators(node: Node): boolean {`
`44033`		`- if (canHaveIllegalDecorators(node) && some(node.decorators)) {`
	`44033`	`+ if (canHaveIllegalDecorators(node) && some(node.illegalDecorators)) {`
`44034`	`44034`	`return grammarErrorOnFirstToken(node, Diagnostics.Decorators_are_not_valid_here);`
`44035`	`44035`	`}`
`44036`	`44036`	`if (!canHaveDecorators(node) \|\| !hasDecorators(node)) {`