Add tests when object spread is used in destructuring

Author: sheetalkamat

tests/baselines/reference/unusedLocalsAndObjectSpread.errors.txt

@@ -0,0 +1,27 @@
+tests/cases/compiler/unusedLocalsAndObjectSpread.ts(7,12): error TS6133: 'a' is declared but never used.
+tests/cases/compiler/unusedLocalsAndObjectSpread.ts(14,15): error TS6133: '_' is declared but never used.
+
+
+==== tests/cases/compiler/unusedLocalsAndObjectSpread.ts (2 errors) ====
+    
+    declare var console: { log(a: any): void };
+    
+    function one() {
+        const foo = { a: 1, b: 2 };
+        // 'a' is declared but never used
+        const {a, ...bar} = foo;
+               ~
+!!! error TS6133: 'a' is declared but never used.
+        console.log(bar);
+    }
+    
+    function two() {
+        const foo = { a: 1, b: 2 };
+        // '_' is declared but never used
+        const {a: _, ...bar} = foo;
+                  ~
+!!! error TS6133: '_' is declared but never used.
+        console.log(bar);
+    }
+    
+    

tests/baselines/reference/unusedLocalsAndObjectSpread.js

@@ -0,0 +1,42 @@
+//// [unusedLocalsAndObjectSpread.ts]
+
+declare var console: { log(a: any): void };
+
+function one() {
+    const foo = { a: 1, b: 2 };
+    // 'a' is declared but never used
+    const {a, ...bar} = foo;
+    console.log(bar);
+}
+
+function two() {
+    const foo = { a: 1, b: 2 };
+    // '_' is declared but never used
+    const {a: _, ...bar} = foo;
+    console.log(bar);
+}
+
+
+
+//// [unusedLocalsAndObjectSpread.js]
+var __rest = (this && this.__rest) || function (s, e) {
+    var t = {};
+    for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0)
+        t[p] = s[p];
+    if (s != null && typeof Object.getOwnPropertySymbols === "function")
+        for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) if (e.indexOf(p[i]) < 0)
+            t[p[i]] = s[p[i]];
+    return t;
+};
+function one() {
+    var foo = { a: 1, b: 2 };
+    // 'a' is declared but never used
+    var a = foo.a, bar = __rest(foo, ["a"]);
+    console.log(bar);
+}
+function two() {
+    var foo = { a: 1, b: 2 };
+    // '_' is declared but never used
+    var _ = foo.a, bar = __rest(foo, ["a"]);
+    console.log(bar);
+}

tests/cases/compiler/unusedLocalsAndObjectSpread.ts

@@ -0,0 +1,18 @@
+//@noUnusedLocals:true
+
+declare var console: { log(a: any): void };
+
+function one() {
+    const foo = { a: 1, b: 2 };
+    // 'a' is declared but never used
+    const {a, ...bar} = foo;
+    console.log(bar);
+}
+
+function two() {
+    const foo = { a: 1, b: 2 };
+    // '_' is declared but never used
+    const {a: _, ...bar} = foo;
+    console.log(bar);
+}
+