revert fix for #2456 'Import namespace exports should be immutable'

src/compiler/checker.ts

@@ -7354,23 +7354,6 @@ module ts {
                 }
             }
 
-            function isImportedNameFromExternalModule(n: Node): boolean {
-                switch (n.kind) {
-                    case SyntaxKind.ElementAccessExpression:
-                    case SyntaxKind.PropertyAccessExpression: {
-                        // all bindings for external module should be immutable
-                        // so attempt to use a.b or a[b] as lhs will always fail
-                        // no matter what b is
-                        let symbol = findSymbol((<PropertyAccessExpression | ElementAccessExpression>n).expression);
-                        return symbol && symbol.flags & SymbolFlags.Alias && isExternalModuleSymbol(resolveAlias(symbol));
-                    }
-                    case SyntaxKind.ParenthesizedExpression:
-                        return isImportedNameFromExternalModule((<ParenthesizedExpression>n).expression);
-                    default:
-                        return false;
-                }
-            }
-
             if (!isReferenceOrErrorExpression(n)) {
                 error(n, invalidReferenceMessage);
                 return false;
@@ -7381,10 +7364,6 @@ module ts {
                 return false;
             }
 
-            if (isImportedNameFromExternalModule(n)) {
-                error(n, invalidReferenceMessage);
-            }
-
             return true;
         }
 

tests/baselines/reference/externalModuleImmutableBindings.errors.txt

@@ -1,164 +1,82 @@
-tests/cases/compiler/f2.ts(5,1): error TS2364: Invalid left-hand side of assignment expression.
-tests/cases/compiler/f2.ts(6,1): error TS2364: Invalid left-hand side of assignment expression.
-tests/cases/compiler/f2.ts(7,1): error TS2364: Invalid left-hand side of assignment expression.
-tests/cases/compiler/f2.ts(7,7): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
-tests/cases/compiler/f2.ts(8,1): error TS2364: Invalid left-hand side of assignment expression.
-tests/cases/compiler/f2.ts(10,1): error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
-tests/cases/compiler/f2.ts(11,1): error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
-tests/cases/compiler/f2.ts(12,1): error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
-tests/cases/compiler/f2.ts(13,1): error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
-tests/cases/compiler/f2.ts(15,1): error TS2364: Invalid left-hand side of assignment expression.
-tests/cases/compiler/f2.ts(16,1): error TS2364: Invalid left-hand side of assignment expression.
-tests/cases/compiler/f2.ts(17,1): error TS2364: Invalid left-hand side of assignment expression.
-tests/cases/compiler/f2.ts(17,8): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
-tests/cases/compiler/f2.ts(18,1): error TS2364: Invalid left-hand side of assignment expression.
-tests/cases/compiler/f2.ts(20,1): error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
-tests/cases/compiler/f2.ts(21,1): error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
-tests/cases/compiler/f2.ts(22,1): error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
-tests/cases/compiler/f2.ts(23,1): error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
-tests/cases/compiler/f2.ts(25,6): error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
-tests/cases/compiler/f2.ts(26,6): error TS2487: Invalid left-hand side in 'for...of' statement.
+tests/cases/compiler/f2.ts(9,7): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
+tests/cases/compiler/f2.ts(19,8): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
 tests/cases/compiler/f2.ts(27,6): error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
-tests/cases/compiler/f2.ts(28,6): error TS2487: Invalid left-hand side in 'for...of' statement.
-tests/cases/compiler/f2.ts(29,6): error TS2406: Invalid left-hand side in 'for...in' statement.
-tests/cases/compiler/f2.ts(29,12): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
-tests/cases/compiler/f2.ts(30,6): error TS2487: Invalid left-hand side in 'for...of' statement.
-tests/cases/compiler/f2.ts(30,12): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
-tests/cases/compiler/f2.ts(31,6): error TS2406: Invalid left-hand side in 'for...in' statement.
-tests/cases/compiler/f2.ts(32,6): error TS2487: Invalid left-hand side in 'for...of' statement.
-tests/cases/compiler/f2.ts(34,6): error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
-tests/cases/compiler/f2.ts(35,6): error TS2487: Invalid left-hand side in 'for...of' statement.
+tests/cases/compiler/f2.ts(29,6): error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
+tests/cases/compiler/f2.ts(31,12): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
+tests/cases/compiler/f2.ts(32,12): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
 tests/cases/compiler/f2.ts(36,6): error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
-tests/cases/compiler/f2.ts(37,6): error TS2487: Invalid left-hand side in 'for...of' statement.
-tests/cases/compiler/f2.ts(38,6): error TS2406: Invalid left-hand side in 'for...in' statement.
-tests/cases/compiler/f2.ts(38,13): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
-tests/cases/compiler/f2.ts(39,6): error TS2487: Invalid left-hand side in 'for...of' statement.
-tests/cases/compiler/f2.ts(39,13): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
-tests/cases/compiler/f2.ts(40,6): error TS2406: Invalid left-hand side in 'for...in' statement.
-tests/cases/compiler/f2.ts(41,6): error TS2487: Invalid left-hand side in 'for...of' statement.
+tests/cases/compiler/f2.ts(38,6): error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
+tests/cases/compiler/f2.ts(40,13): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
+tests/cases/compiler/f2.ts(41,13): error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
 
 
 ==== tests/cases/compiler/f1.ts (0 errors) ====
     export var x = 1;
 
-==== tests/cases/compiler/f2.ts (38 errors) ====
+==== tests/cases/compiler/f2.ts (10 errors) ====
+
+    // all mutations below are illegal and should be fixed
     import * as stuff from 'f1';
 
     var n = 'baz';
 
     stuff.x = 0;
-    ~~~~~~~
-!!! error TS2364: Invalid left-hand side of assignment expression.
     stuff['x'] = 1;
-    ~~~~~~~~~~
-!!! error TS2364: Invalid left-hand side of assignment expression.
     stuff.blah = 2;
-    ~~~~~~~~~~
-!!! error TS2364: Invalid left-hand side of assignment expression.
           ~~~~
 !!! error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
     stuff[n] = 3;
-    ~~~~~~~~
-!!! error TS2364: Invalid left-hand side of assignment expression.
 
     stuff.x++;
-    ~~~~~~~
-!!! error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
     stuff['x']++;
-    ~~~~~~~~~~
-!!! error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
     stuff['blah']++;
-    ~~~~~~~~~~~~~
-!!! error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
     stuff[n]++;
-    ~~~~~~~~
-!!! error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
 
     (stuff.x) = 0;
-    ~~~~~~~~~
-!!! error TS2364: Invalid left-hand side of assignment expression.
     (stuff['x']) = 1;
-    ~~~~~~~~~~~~
-!!! error TS2364: Invalid left-hand side of assignment expression.
     (stuff.blah) = 2;
-    ~~~~~~~~~~~~
-!!! error TS2364: Invalid left-hand side of assignment expression.
            ~~~~
 !!! error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
     (stuff[n]) = 3;
-    ~~~~~~~~~~
-!!! error TS2364: Invalid left-hand side of assignment expression.
 
     (stuff.x)++;
-    ~~~~~~~~~
-!!! error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
     (stuff['x'])++;
-    ~~~~~~~~~~~~
-!!! error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
     (stuff['blah'])++;
-    ~~~~~~~~~~~~~~~
-!!! error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
     (stuff[n])++;
-    ~~~~~~~~~~
-!!! error TS2357: The operand of an increment or decrement operator must be a variable, property or indexer.
 
     for (stuff.x in []) {}
          ~~~~~~~
 !!! error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
     for (stuff.x of []) {}
-         ~~~~~~~
-!!! error TS2487: Invalid left-hand side in 'for...of' statement.
     for (stuff['x'] in []) {}
          ~~~~~~~~~~
 !!! error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
     for (stuff['x'] of []) {}
-         ~~~~~~~~~~
-!!! error TS2487: Invalid left-hand side in 'for...of' statement.
     for (stuff.blah in []) {}
-         ~~~~~~~~~~
-!!! error TS2406: Invalid left-hand side in 'for...in' statement.
                ~~~~
 !!! error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
     for (stuff.blah of []) {}
-         ~~~~~~~~~~
-!!! error TS2487: Invalid left-hand side in 'for...of' statement.
                ~~~~
 !!! error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
     for (stuff[n] in []) {}
-         ~~~~~~~~
-!!! error TS2406: Invalid left-hand side in 'for...in' statement.
     for (stuff[n] of []) {}
-         ~~~~~~~~
-!!! error TS2487: Invalid left-hand side in 'for...of' statement.
 
     for ((stuff.x) in []) {}
          ~~~~~~~~~
 !!! error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
     for ((stuff.x) of []) {}
-         ~~~~~~~~~
-!!! error TS2487: Invalid left-hand side in 'for...of' statement.
     for ((stuff['x']) in []) {}
          ~~~~~~~~~~~~
 !!! error TS2405: The left-hand side of a 'for...in' statement must be of type 'string' or 'any'.
     for ((stuff['x']) of []) {}
-         ~~~~~~~~~~~~
-!!! error TS2487: Invalid left-hand side in 'for...of' statement.
     for ((stuff.blah) in []) {}
-         ~~~~~~~~~~~~
-!!! error TS2406: Invalid left-hand side in 'for...in' statement.
                 ~~~~
 !!! error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
     for ((stuff.blah) of []) {}
-         ~~~~~~~~~~~~
-!!! error TS2487: Invalid left-hand side in 'for...of' statement.
                 ~~~~
 !!! error TS2339: Property 'blah' does not exist on type 'typeof "tests/cases/compiler/f1"'.
     for ((stuff[n]) in []) {}
-         ~~~~~~~~~~
-!!! error TS2406: Invalid left-hand side in 'for...in' statement.
     for ((stuff[n]) of []) {}
-         ~~~~~~~~~~
-!!! error TS2487: Invalid left-hand side in 'for...of' statement.
 
 
 

tests/baselines/reference/externalModuleImmutableBindings.js

@@ -4,6 +4,8 @@
 export var x = 1;
 
 //// [f2.ts]
+
+// all mutations below are illegal and should be fixed
 import * as stuff from 'f1';
 
 var n = 'baz';
@@ -52,6 +54,7 @@ for ((stuff[n]) of []) {}
 //// [f1.js]
 exports.x = 1;
 //// [f2.js]
+// all mutations below are illegal and should be fixed
 var stuff = require('f1');
 var n = 'baz';
 stuff.x = 0;

tests/cases/compiler/externalModuleImmutableBindings.ts

@@ -3,6 +3,8 @@
 export var x = 1;
 
 // @Filename: f2.ts
+
+// all mutations below are illegal and should be fixed
 import * as stuff from 'f1';
 
 var n = 'baz';