Do not emit __rest for --target esnext

Author: sandersn

src/compiler/emitter.ts

@@ -2231,7 +2231,7 @@ const _super = (function (geti, seti) {
                 assignEmitted = true;
             }
 
-            if (!restEmitted && node.flags & NodeFlags.HasRestAttribute) {
+            if (languageVersion < ScriptTarget.ESNext && !restEmitted && node.flags & NodeFlags.HasRestAttribute) {
                 writeLines(restHelper);
                 restEmitted = true;
             }

tests/baselines/reference/objectSpreadNoTransform.js

@@ -1,8 +1,14 @@
 //// [objectSpreadNoTransform.ts]
 const y = { a: 'yes', b: 'no' };
 const o = { x: 1, ...y };
+var b;
+var rest;
+({ b, ...rest } = o);
 
 
 //// [objectSpreadNoTransform.js]
 const y = { a: 'yes', b: 'no' };
 const o = { x: 1, ...y };
+var b;
+var rest;
+({ b, ...rest } = o);

tests/baselines/reference/objectSpreadNoTransform.symbols

@@ -8,3 +8,13 @@ const o = { x: 1, ...y };
 >o : Symbol(o, Decl(objectSpreadNoTransform.ts, 1, 5))
 >x : Symbol(x, Decl(objectSpreadNoTransform.ts, 1, 11))
 
+var b;
+>b : Symbol(b, Decl(objectSpreadNoTransform.ts, 2, 3))
+
+var rest;
+>rest : Symbol(rest, Decl(objectSpreadNoTransform.ts, 3, 3))
+
+({ b, ...rest } = o);
+>b : Symbol(b, Decl(objectSpreadNoTransform.ts, 4, 2))
+>o : Symbol(o, Decl(objectSpreadNoTransform.ts, 1, 5))
+

tests/baselines/reference/objectSpreadNoTransform.types

@@ -14,3 +14,17 @@ const o = { x: 1, ...y };
 >1 : 1
 >y : any
 
+var b;
+>b : any
+
+var rest;
+>rest : any
+
+({ b, ...rest } = o);
+>({ b, ...rest } = o) : { a: string; b: string; x: number; }
+>{ b, ...rest } = o : { a: string; b: string; x: number; }
+>{ b, ...rest } : any
+>b : any
+>rest : any
+>o : { a: string; b: string; x: number; }
+

tests/cases/conformance/types/spread/objectSpreadNoTransform.ts

@@ -1,3 +1,6 @@
 // @target: esnext
 const y = { a: 'yes', b: 'no' };
 const o = { x: 1, ...y };
+var b;
+var rest;
+({ b, ...rest } = o);