Merge pull request #5009 from RyanCavanaugh/fix4832

Correctly emit 'as' operator left operand as expression

src/compiler/emitter.ts

@@ -1434,6 +1434,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, Promi
                 let parent = node.parent;
                 switch (parent.kind) {
                     case SyntaxKind.ArrayLiteralExpression:
+                    case SyntaxKind.AsExpression:
                     case SyntaxKind.BinaryExpression:
                     case SyntaxKind.CallExpression:
                     case SyntaxKind.CaseClause:

tests/baselines/reference/asOperator4.js

@@ -0,0 +1,22 @@
+//// [tests/cases/conformance/expressions/asOperator/asOperator4.ts] ////
+
+//// [foo.ts]
+
+export function foo() { }
+
+//// [bar.ts]
+import { foo } from './foo';
+
+// These should emit identically
+<any>foo;
+(foo as any);
+
+
+//// [foo.js]
+function foo() { }
+exports.foo = foo;
+//// [bar.js]
+var foo_1 = require('./foo');
+// These should emit identically
+foo_1.foo;
+foo_1.foo;

tests/baselines/reference/asOperator4.symbols

@@ -0,0 +1,16 @@
+=== tests/cases/conformance/expressions/asOperator/foo.ts ===
+
+export function foo() { }
+>foo : Symbol(foo, Decl(foo.ts, 0, 0))
+
+=== tests/cases/conformance/expressions/asOperator/bar.ts ===
+import { foo } from './foo';
+>foo : Symbol(foo, Decl(bar.ts, 0, 8))
+
+// These should emit identically
+<any>foo;
+>foo : Symbol(foo, Decl(bar.ts, 0, 8))
+
+(foo as any);
+>foo : Symbol(foo, Decl(bar.ts, 0, 8))
+

tests/baselines/reference/asOperator4.types

@@ -0,0 +1,19 @@
+=== tests/cases/conformance/expressions/asOperator/foo.ts ===
+
+export function foo() { }
+>foo : () => void
+
+=== tests/cases/conformance/expressions/asOperator/bar.ts ===
+import { foo } from './foo';
+>foo : () => void
+
+// These should emit identically
+<any>foo;
+><any>foo : any
+>foo : () => void
+
+(foo as any);
+>(foo as any) : any
+>foo as any : any
+>foo : () => void
+

tests/cases/conformance/expressions/asOperator/asOperator4.ts

@@ -0,0 +1,11 @@
+//@module: commonjs
+//@filename: foo.ts
+
+export function foo() { }
+
+//@filename: bar.ts
+import { foo } from './foo';
+
+// These should emit identically
+<any>foo;
+(foo as any);