diff --git a/packages/babel-helpers/src/helpers-generated.ts b/packages/babel-helpers/src/helpers-generated.ts
index 5462167aace7..cd7f37a0b0c9 100644
--- a/packages/babel-helpers/src/helpers-generated.ts
+++ b/packages/babel-helpers/src/helpers-generated.ts
@@ -35,7 +35,7 @@ export default Object.freeze({
   ),
   applyDecs2301: helper(
     "7.20.0",
-    'import checkInRHS from"checkInRHS";function createAddInitializerMethod(initializers,decoratorFinishedRef){return function(initializer){assertNotFinished(decoratorFinishedRef,"addInitializer"),assertCallable(initializer,"An initializer"),initializers.push(initializer)}}function assertInstanceIfPrivate(has,target){if(!has(target))throw new TypeError("Attempted to access private element on non-instance")}function memberDec(dec,name,desc,initializers,kind,isStatic,isPrivate,value,hasPrivateBrand){var kindStr;switch(kind){case 1:kindStr="accessor";break;case 2:kindStr="method";break;case 3:kindStr="getter";break;case 4:kindStr="setter";break;default:kindStr="field"}var get,set,ctx={kind:kindStr,name:isPrivate?"#"+name:name,static:isStatic,private:isPrivate},decoratorFinishedRef={v:!1};if(0!==kind&&(ctx.addInitializer=createAddInitializerMethod(initializers,decoratorFinishedRef)),isPrivate||0!==kind&&2!==kind)if(2===kind)get=function(target){return assertInstanceIfPrivate(hasPrivateBrand,target),desc.value};else{var t=0===kind||1===kind;(t||3===kind)&&(get=function(target){return isPrivate&&assertInstanceIfPrivate(hasPrivateBrand,target),desc.get.call(target)}),(t||4===kind)&&(set=function(target,value){isPrivate&&assertInstanceIfPrivate(hasPrivateBrand,target),desc.set.call(target,value)})}else get=function(target){return target[name]},0===kind&&(set=function(target,v){target[name]=v});var has=isPrivate?hasPrivateBrand.bind():function(target){return name in target};ctx.access=get&&set?{get:get,set:set,has:has}:get?{get:get,has:has}:{set:set,has:has};try{return dec(value,ctx)}finally{decoratorFinishedRef.v=!0}}function assertNotFinished(decoratorFinishedRef,fnName){if(decoratorFinishedRef.v)throw new Error("attempted to call "+fnName+" after decoration was finished")}function assertCallable(fn,hint){if("function"!=typeof fn)throw new TypeError(hint+" must be a function")}function assertValidReturnValue(kind,value){var type=typeof value;if(1===kind){if("object"!==type||null===value)throw new TypeError("accessor decorators must return an object with get, set, or init properties or void 0");void 0!==value.get&&assertCallable(value.get,"accessor.get"),void 0!==value.set&&assertCallable(value.set,"accessor.set"),void 0!==value.init&&assertCallable(value.init,"accessor.init")}else if("function"!==type){var hint;throw hint=0===kind?"field":10===kind?"class":"method",new TypeError(hint+" decorators must return a function or void 0")}}function curryThis1(fn){return function(){return fn(this)}}function curryThis2(fn){return function(value){fn(this,value)}}function applyMemberDec(ret,base,decInfo,name,kind,isStatic,isPrivate,initializers,hasPrivateBrand){var desc,init,value,newValue,get,set,decs=decInfo[0];if(isPrivate?desc=0===kind||1===kind?{get:curryThis1(decInfo[3]),set:curryThis2(decInfo[4])}:3===kind?{get:decInfo[3]}:4===kind?{set:decInfo[3]}:{value:decInfo[3]}:0!==kind&&(desc=Object.getOwnPropertyDescriptor(base,name)),1===kind?value={get:desc.get,set:desc.set}:2===kind?value=desc.value:3===kind?value=desc.get:4===kind&&(value=desc.set),"function"==typeof decs)void 0!==(newValue=memberDec(decs,name,desc,initializers,kind,isStatic,isPrivate,value,hasPrivateBrand))&&(assertValidReturnValue(kind,newValue),0===kind?init=newValue:1===kind?(init=newValue.init,get=newValue.get||value.get,set=newValue.set||value.set,value={get:get,set:set}):value=newValue);else for(var i=decs.length-1;i>=0;i--){var newInit;if(void 0!==(newValue=memberDec(decs[i],name,desc,initializers,kind,isStatic,isPrivate,value,hasPrivateBrand)))assertValidReturnValue(kind,newValue),0===kind?newInit=newValue:1===kind?(newInit=newValue.init,get=newValue.get||value.get,set=newValue.set||value.set,value={get:get,set:set}):value=newValue,void 0!==newInit&&(void 0===init?init=newInit:"function"==typeof init?init=[init,newInit]:init.push(newInit))}if(0===kind||1===kind){if(void 0===init)init=function(instance,init){return init};else if("function"!=typeof init){var ownInitializers=init;init=function(instance,init){for(var value=init,i=0;i<ownInitializers.length;i++)value=ownInitializers[i].call(instance,value);return value}}else{var originalInitializer=init;init=function(instance,init){return originalInitializer.call(instance,init)}}ret.push(init)}0!==kind&&(1===kind?(desc.get=value.get,desc.set=value.set):2===kind?desc.value=value:3===kind?desc.get=value:4===kind&&(desc.set=value),isPrivate?1===kind?(ret.push((function(instance,args){return value.get.call(instance,args)})),ret.push((function(instance,args){return value.set.call(instance,args)}))):2===kind?ret.push(value):ret.push((function(instance,args){return value.call(instance,args)})):Object.defineProperty(base,name,desc))}function applyMemberDecs(Class,decInfos,instanceBrand){for(var protoInitializers,staticInitializers,staticBrand,ret=[],existingProtoNonFields=new Map,existingStaticNonFields=new Map,i=0;i<decInfos.length;i++){var decInfo=decInfos[i];if(Array.isArray(decInfo)){var base,initializers,kind=decInfo[1],name=decInfo[2],isPrivate=decInfo.length>3,isStatic=kind>=5,hasPrivateBrand=instanceBrand;if(isStatic?(base=Class,0!==(kind-=5)&&(initializers=staticInitializers=staticInitializers||[]),staticBrand||(staticBrand=function(_){return checkInRHS(_)===Class}),hasPrivateBrand=staticBrand):(base=Class.prototype,0!==kind&&(initializers=protoInitializers=protoInitializers||[])),0!==kind&&!isPrivate){var existingNonFields=isStatic?existingStaticNonFields:existingProtoNonFields,existingKind=existingNonFields.get(name)||0;if(!0===existingKind||3===existingKind&&4!==kind||4===existingKind&&3!==kind)throw new Error("Attempted to decorate a public method/accessor that has the same name as a previously decorated public method/accessor. This is not currently supported by the decorators plugin. Property name was: "+name);!existingKind&&kind>2?existingNonFields.set(name,kind):existingNonFields.set(name,!0)}applyMemberDec(ret,base,decInfo,name,kind,isStatic,isPrivate,initializers,hasPrivateBrand)}}return pushInitializers(ret,protoInitializers),pushInitializers(ret,staticInitializers),ret}function pushInitializers(ret,initializers){initializers&&ret.push((function(instance){for(var i=0;i<initializers.length;i++)initializers[i].call(instance);return instance}))}function applyClassDecs(targetClass,classDecs){if(classDecs.length>0){for(var initializers=[],newClass=targetClass,name=targetClass.name,i=classDecs.length-1;i>=0;i--){var decoratorFinishedRef={v:!1};try{var nextNewClass=classDecs[i](newClass,{kind:"class",name:name,addInitializer:createAddInitializerMethod(initializers,decoratorFinishedRef)})}finally{decoratorFinishedRef.v=!0}void 0!==nextNewClass&&(assertValidReturnValue(10,nextNewClass),newClass=nextNewClass)}return[newClass,function(){for(var i=0;i<initializers.length;i++)initializers[i].call(newClass)}]}}export default function applyDecs2301(targetClass,memberDecs,classDecs,instanceBrand){return{e:applyMemberDecs(targetClass,memberDecs,instanceBrand),get c(){return applyClassDecs(targetClass,classDecs)}}}',
+    'import checkInRHS from"checkInRHS";function createAddInitializerMethod(initializers,decoratorFinishedRef){return function(initializer){assertNotFinished(decoratorFinishedRef,"addInitializer"),assertCallable(initializer,"An initializer"),initializers.push(initializer)}}function assertInstanceIfPrivate(has,target){if(!has(target))throw new TypeError("Attempted to access private element on non-instance")}function memberDec(dec,name,desc,initializers,kind,isStatic,isPrivate,value,hasPrivateBrand){var kindStr;switch(kind){case 1:kindStr="accessor";break;case 2:kindStr="method";break;case 3:kindStr="getter";break;case 4:kindStr="setter";break;default:kindStr="field"}var get,set,ctx={kind:kindStr,name:isPrivate?"#"+name:name,static:isStatic,private:isPrivate},decoratorFinishedRef={v:!1};if(0!==kind&&(ctx.addInitializer=createAddInitializerMethod(initializers,decoratorFinishedRef)),isPrivate||0!==kind&&2!==kind)if(2===kind)get=function(target){return assertInstanceIfPrivate(hasPrivateBrand,target),desc.value};else{var t=0===kind||1===kind;(t||3===kind)&&(get=isPrivate?function(target){return assertInstanceIfPrivate(hasPrivateBrand,target),desc.get.call(target)}:function(target){return desc.get.call(target)}),(t||4===kind)&&(set=isPrivate?function(target,value){assertInstanceIfPrivate(hasPrivateBrand,target),desc.set.call(target,value)}:function(target,value){desc.set.call(target,value)})}else get=function(target){return target[name]},0===kind&&(set=function(target,v){target[name]=v});var has=isPrivate?hasPrivateBrand.bind():function(target){return name in target};ctx.access=get&&set?{get:get,set:set,has:has}:get?{get:get,has:has}:{set:set,has:has};try{return dec(value,ctx)}finally{decoratorFinishedRef.v=!0}}function assertNotFinished(decoratorFinishedRef,fnName){if(decoratorFinishedRef.v)throw new Error("attempted to call "+fnName+" after decoration was finished")}function assertCallable(fn,hint){if("function"!=typeof fn)throw new TypeError(hint+" must be a function")}function assertValidReturnValue(kind,value){var type=typeof value;if(1===kind){if("object"!==type||null===value)throw new TypeError("accessor decorators must return an object with get, set, or init properties or void 0");void 0!==value.get&&assertCallable(value.get,"accessor.get"),void 0!==value.set&&assertCallable(value.set,"accessor.set"),void 0!==value.init&&assertCallable(value.init,"accessor.init")}else if("function"!==type){var hint;throw hint=0===kind?"field":10===kind?"class":"method",new TypeError(hint+" decorators must return a function or void 0")}}function curryThis1(fn){return function(){return fn(this)}}function curryThis2(fn){return function(value){fn(this,value)}}function applyMemberDec(ret,base,decInfo,name,kind,isStatic,isPrivate,initializers,hasPrivateBrand){var desc,init,value,newValue,get,set,decs=decInfo[0];if(isPrivate?desc=0===kind||1===kind?{get:curryThis1(decInfo[3]),set:curryThis2(decInfo[4])}:3===kind?{get:decInfo[3]}:4===kind?{set:decInfo[3]}:{value:decInfo[3]}:0!==kind&&(desc=Object.getOwnPropertyDescriptor(base,name)),1===kind?value={get:desc.get,set:desc.set}:2===kind?value=desc.value:3===kind?value=desc.get:4===kind&&(value=desc.set),"function"==typeof decs)void 0!==(newValue=memberDec(decs,name,desc,initializers,kind,isStatic,isPrivate,value,hasPrivateBrand))&&(assertValidReturnValue(kind,newValue),0===kind?init=newValue:1===kind?(init=newValue.init,get=newValue.get||value.get,set=newValue.set||value.set,value={get:get,set:set}):value=newValue);else for(var i=decs.length-1;i>=0;i--){var newInit;if(void 0!==(newValue=memberDec(decs[i],name,desc,initializers,kind,isStatic,isPrivate,value,hasPrivateBrand)))assertValidReturnValue(kind,newValue),0===kind?newInit=newValue:1===kind?(newInit=newValue.init,get=newValue.get||value.get,set=newValue.set||value.set,value={get:get,set:set}):value=newValue,void 0!==newInit&&(void 0===init?init=newInit:"function"==typeof init?init=[init,newInit]:init.push(newInit))}if(0===kind||1===kind){if(void 0===init)init=function(instance,init){return init};else if("function"!=typeof init){var ownInitializers=init;init=function(instance,init){for(var value=init,i=0;i<ownInitializers.length;i++)value=ownInitializers[i].call(instance,value);return value}}else{var originalInitializer=init;init=function(instance,init){return originalInitializer.call(instance,init)}}ret.push(init)}0!==kind&&(1===kind?(desc.get=value.get,desc.set=value.set):2===kind?desc.value=value:3===kind?desc.get=value:4===kind&&(desc.set=value),isPrivate?1===kind?(ret.push((function(instance,args){return value.get.call(instance,args)})),ret.push((function(instance,args){return value.set.call(instance,args)}))):2===kind?ret.push(value):ret.push((function(instance,args){return value.call(instance,args)})):Object.defineProperty(base,name,desc))}function applyMemberDecs(Class,decInfos,instanceBrand){for(var protoInitializers,staticInitializers,staticBrand,ret=[],existingProtoNonFields=new Map,existingStaticNonFields=new Map,i=0;i<decInfos.length;i++){var decInfo=decInfos[i];if(Array.isArray(decInfo)){var base,initializers,kind=decInfo[1],name=decInfo[2],isPrivate=decInfo.length>3,isStatic=kind>=5,hasPrivateBrand=instanceBrand;if(isStatic?(base=Class,0!==(kind-=5)&&(initializers=staticInitializers=staticInitializers||[]),isPrivate&&!staticBrand&&(staticBrand=function(_){return checkInRHS(_)===Class}),hasPrivateBrand=staticBrand):(base=Class.prototype,0!==kind&&(initializers=protoInitializers=protoInitializers||[])),0!==kind&&!isPrivate){var existingNonFields=isStatic?existingStaticNonFields:existingProtoNonFields,existingKind=existingNonFields.get(name)||0;if(!0===existingKind||3===existingKind&&4!==kind||4===existingKind&&3!==kind)throw new Error("Attempted to decorate a public method/accessor that has the same name as a previously decorated public method/accessor. This is not currently supported by the decorators plugin. Property name was: "+name);!existingKind&&kind>2?existingNonFields.set(name,kind):existingNonFields.set(name,!0)}applyMemberDec(ret,base,decInfo,name,kind,isStatic,isPrivate,initializers,hasPrivateBrand)}}return pushInitializers(ret,protoInitializers),pushInitializers(ret,staticInitializers),ret}function pushInitializers(ret,initializers){initializers&&ret.push((function(instance){for(var i=0;i<initializers.length;i++)initializers[i].call(instance);return instance}))}function applyClassDecs(targetClass,classDecs){if(classDecs.length>0){for(var initializers=[],newClass=targetClass,name=targetClass.name,i=classDecs.length-1;i>=0;i--){var decoratorFinishedRef={v:!1};try{var nextNewClass=classDecs[i](newClass,{kind:"class",name:name,addInitializer:createAddInitializerMethod(initializers,decoratorFinishedRef)})}finally{decoratorFinishedRef.v=!0}void 0!==nextNewClass&&(assertValidReturnValue(10,nextNewClass),newClass=nextNewClass)}return[newClass,function(){for(var i=0;i<initializers.length;i++)initializers[i].call(newClass)}]}}export default function applyDecs2301(targetClass,memberDecs,classDecs,instanceBrand){return{e:applyMemberDecs(targetClass,memberDecs,instanceBrand),get c(){return applyClassDecs(targetClass,classDecs)}}}',
   ),
   asyncGeneratorDelegate: helper(
     "7.0.0-beta.0",
diff --git a/packages/babel-helpers/src/helpers/applyDecs2301.js b/packages/babel-helpers/src/helpers/applyDecs2301.js
index 35336e9492d3..813df640a4d8 100644
--- a/packages/babel-helpers/src/helpers/applyDecs2301.js
+++ b/packages/babel-helpers/src/helpers/applyDecs2301.js
@@ -100,16 +100,28 @@ function memberDec(
     // Assert: If kind === 0, then isPrivate is true.
     var t = kind === 0 /* FIELD */ || kind === 1; /* ACCESSOR */
     if (t || kind === 3 /* GETTER */) {
-      get = function (target) {
-        if (isPrivate) assertInstanceIfPrivate(hasPrivateBrand, target);
-        return desc.get.call(target);
-      };
+      if (isPrivate) {
+        get = function (target) {
+          assertInstanceIfPrivate(hasPrivateBrand, target);
+          return desc.get.call(target);
+        };
+      } else {
+        get = function (target) {
+          return desc.get.call(target);
+        };
+      }
     }
     if (t || kind === 4 /* SETTER */) {
-      set = function (target, value) {
-        if (isPrivate) assertInstanceIfPrivate(hasPrivateBrand, target);
-        desc.set.call(target, value);
-      };
+      if (isPrivate) {
+        set = function (target, value) {
+          assertInstanceIfPrivate(hasPrivateBrand, target);
+          desc.set.call(target, value);
+        };
+      } else {
+        set = function (target, value) {
+          desc.set.call(target, value);
+        };
+      }
     }
   }
   var has = isPrivate
@@ -409,7 +421,7 @@ function applyMemberDecs(Class, decInfos, instanceBrand) {
         staticInitializers = staticInitializers || [];
         initializers = staticInitializers;
       }
-      if (!staticBrand) {
+      if (isPrivate && !staticBrand) {
         staticBrand = function (_) {
           return checkInRHS(_) === Class;
         };