Fix __spreadArray for non-concat-spreadables (microsoft#45386)

src/compiler/factory/emitHelpers.ts

@@ -647,7 +647,7 @@ namespace ts {
                         ar[i] = from[i];
                     }
                 }
-                return to.concat(ar || from);
+                return to.concat(ar || Array.prototype.slice.call(from));
             };`
     };
 

tests/baselines/reference/argumentExpressionContextualTyping.js

@@ -26,7 +26,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 // In a typed function call, argument expressions are contextually typed by their corresponding parameter types.
 function foo(_a) {

tests/baselines/reference/arrayLiteralExpressionContextualTyping.js

@@ -23,7 +23,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 // In a contextually typed array literal expression containing no spread elements, an element expression at index N is contextually typed by
 //      the type of the property with the numeric name N in the contextual type, if any, or otherwise

tests/baselines/reference/arrayLiteralSpread.js

@@ -31,7 +31,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 function f0() {
     var a = [1, 2, 3];

tests/baselines/reference/arrayLiteralSpreadES5iterable.js

@@ -47,7 +47,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 function f0() {
     var a = [1, 2, 3];

tests/baselines/reference/arrayLiterals2ES5.js

@@ -69,7 +69,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 // SpreadElement:
 //      ...   AssignmentExpression

tests/baselines/reference/arrayLiterals3.js

@@ -47,7 +47,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 // The resulting type an array literal expression is determined as follows:
 //     - If the array literal contains no spread elements and is contextually typed by a tuple-like type,

tests/baselines/reference/callChain.js

@@ -50,7 +50,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o;
 o1 === null || o1 === void 0 ? void 0 : o1();

tests/baselines/reference/callOverload.js

@@ -19,7 +19,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var n;
 fn(1); // no error

tests/baselines/reference/callWithSpread.js

@@ -81,7 +81,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var _a, _b, _c, _d, _e, _f, _g;
 function foo(x, y) {

tests/baselines/reference/callWithSpread2.js

@@ -45,7 +45,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 // good
 all.apply(void 0, ns);

tests/baselines/reference/callWithSpread3.js

@@ -44,7 +44,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 // error
 fs2.apply(void 0, __spreadArray(['a'], s2, false)); // error on ...s2

tests/baselines/reference/callWithSpread5.js

@@ -16,7 +16,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 fn.apply(void 0, __spreadArray(__spreadArray([], nnnu, false), [x], false));
 fn.apply(void 0, __spreadArray(__spreadArray([], nntnnnt, false), [x], false));

tests/baselines/reference/destructuringArrayBindingPatternAndAssignment1ES5.js

@@ -77,7 +77,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 // In a destructuring assignment expression, the type of the expression on the right must be assignable to the assignment target on the left.
 // An expression of type S is considered assignable to an assignment target V if one of the following is true

tests/baselines/reference/destructuringArrayBindingPatternAndAssignment1ES5iterable.js

@@ -93,7 +93,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 // In a destructuring assignment expression, the type of the expression on the right must be assignable to the assignment target on the left.
 // An expression of type S is considered assignable to an assignment target V if one of the following is true

tests/baselines/reference/destructuringArrayBindingPatternAndAssignment2.js

@@ -42,7 +42,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 // V is an array assignment pattern, S is the type Any or an array-like type (section 3.3.2), and, for each assignment element E in V,
 //      S is the type Any, or

tests/baselines/reference/destructuringParameterDeclaration3ES5iterable.js

@@ -71,7 +71,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 function a1() {
     var x = [];

tests/baselines/reference/destructuringVariableDeclaration1ES5.js

@@ -49,7 +49,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 // The type T associated with a destructuring variable declaration is determined as follows:
 //      If the declaration includes a type annotation, T is that type.

tests/baselines/reference/destructuringVariableDeclaration1ES5iterable.js

@@ -65,7 +65,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 // The type T associated with a destructuring variable declaration is determined as follows:
 //      If the declaration includes a type annotation, T is that type.

tests/baselines/reference/excessiveStackDepthFlatArray.js

@@ -48,7 +48,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 configureStore({
     middleware: __spreadArray([], defaultMiddleware, true)

tests/baselines/reference/excessivelyLargeTupleSpread.js

@@ -48,7 +48,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var a0 = [0];
 var a1 = __spreadArray(__spreadArray([], a0, true), a0, true);

tests/baselines/reference/functionParameterArityMismatch.js

@@ -24,7 +24,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 f1();
 f1(1, 2);

tests/baselines/reference/genericRestParameters1.js

@@ -174,7 +174,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 f1 = f2;
 f2 = f1;

tests/baselines/reference/genericRestParameters2.js

@@ -88,7 +88,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 f10(42, "hello");
 f10(42, "hello", true);

tests/baselines/reference/genericRestParameters3.js

@@ -75,7 +75,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 f1("foo", "abc");
 f1("foo", 10, true);

tests/baselines/reference/keyofAndIndexedAccess.js

@@ -681,7 +681,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var Shape = /** @class */ (function () {
     function Shape() {

tests/baselines/reference/literalFreshnessPropagationOnNarrowing.js

@@ -69,7 +69,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 function f1() {
     var b = true;

tests/baselines/reference/newWithSpread.js

@@ -104,7 +104,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o, _p, _q, _r, _s, _t;
 function f(x, y) {

tests/baselines/reference/newWithSpreadES5.js

@@ -103,7 +103,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var _a, _b, _c, _d, _e, _f, _g, _h, _j, _k, _l, _m, _o, _p, _q, _r, _s, _t;
 function f(x, y) {

tests/baselines/reference/noCrashOnNoLib.js

@@ -15,7 +15,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 exports.__esModule = true;
 exports.f = void 0;

tests/baselines/reference/operationsAvailableOnPromisedType.js

@@ -80,7 +80,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 function fn(a, b, c, d, e, f, g) {
     var c_1, c_1_1;

tests/baselines/reference/readonlyRestParameters.js

@@ -36,7 +36,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 function f0(a, b) {
     f0(a, b);

tests/baselines/reference/recursiveReverseMappedType.js

@@ -24,7 +24,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 function join(l) {
     return __spreadArray(['marker'], l, true);

tests/baselines/reference/recursiveTypeReferences1.js

@@ -139,7 +139,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var a0 = 1;
 var a1 = [1, [2, 3], [4, [5, [6, 7]]]];

tests/baselines/reference/restTuplesFromContextualTypes.js

@@ -108,7 +108,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 (function (a, b, c) { }).apply(void 0, t1);
 (function () {

tests/baselines/reference/selfReferencingSpreadInLoop.js

@@ -13,7 +13,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var additional = [];
 for (var _i = 0, _a = [1, 2, 3]; _i < _a.length; _i++) {

tests/baselines/reference/spliceTuples.js

@@ -32,7 +32,7 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 var k1;
 k1 = __spreadArray([1], sb, true);

tests/baselines/reference/spreadBooleanRespectsFreshness.js

@@ -15,6 +15,6 @@ var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
             ar[i] = from[i];
         }
     }
-    return to.concat(ar || from);
+    return to.concat(ar || Array.prototype.slice.call(from));
 };
 foo1 = __spreadArray([], Array.isArray(foo2) ? foo2 : [foo2], true);