throw an error when no default export present (microsoft#35815)

src/compiler/checker.ts

@@ -2322,13 +2322,18 @@ namespace ts {
                     else {
                         symbolFromVariable = getPropertyOfVariable(targetSymbol, name.escapedText);
                     }
+
                     // if symbolFromVariable is export - get its final target
                     symbolFromVariable = resolveSymbol(symbolFromVariable, dontResolveAlias);
+
                     let symbolFromModule = getExportOfModule(targetSymbol, name.escapedText, dontResolveAlias);
-                    // If the export member we're looking for is default, and there is no real default but allowSyntheticDefaultImports is on, return the entire module as the default
-                    if (!symbolFromModule && allowSyntheticDefaultImports && name.escapedText === InternalSymbolName.Default) {
-                        symbolFromModule = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
+                    if (symbolFromModule === undefined && name.escapedText === InternalSymbolName.Default) {
+                        const file = find(moduleSymbol.declarations, isSourceFile);
+                        if (canHaveSyntheticDefault(file, moduleSymbol, dontResolveAlias)) {
+                            symbolFromModule = resolveExternalModuleSymbol(moduleSymbol, dontResolveAlias) || resolveSymbol(moduleSymbol, dontResolveAlias);
+                        }
                     }
+
                     const symbol = symbolFromModule && symbolFromVariable && symbolFromModule !== symbolFromVariable ?
                         combineValueAndTypeSymbols(symbolFromVariable, symbolFromModule) :
                         symbolFromModule || symbolFromVariable;

tests/baselines/reference/reexportMissingDefault.errors.txt

@@ -0,0 +1,11 @@
+tests/cases/compiler/a.ts(2,10): error TS2305: Module '"./b"' has no exported member 'default'.
+
+
+==== tests/cases/compiler/b.ts (0 errors) ====
+    export const b = null;
+
+==== tests/cases/compiler/a.ts (1 errors) ====
+    export { b } from "./b";
+    export { default } from "./b";
+             ~~~~~~~
+!!! error TS2305: Module '"./b"' has no exported member 'default'.

tests/baselines/reference/reexportMissingDefault.js

@@ -0,0 +1,20 @@
+//// [tests/cases/compiler/reexportMissingDefault.ts] ////
+
+//// [b.ts]
+export const b = null;
+
+//// [a.ts]
+export { b } from "./b";
+export { default } from "./b";
+
+//// [b.js]
+"use strict";
+exports.__esModule = true;
+exports.b = null;
+//// [a.js]
+"use strict";
+exports.__esModule = true;
+var b_1 = require("./b");
+exports.b = b_1.b;
+var b_2 = require("./b");
+exports["default"] = b_2["default"];

tests/baselines/reference/reexportMissingDefault.symbols

@@ -0,0 +1,11 @@
+=== tests/cases/compiler/b.ts ===
+export const b = null;
+>b : Symbol(b, Decl(b.ts, 0, 12))
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : Symbol(b, Decl(a.ts, 0, 8))
+
+export { default } from "./b";
+>default : Symbol(default, Decl(a.ts, 1, 8))
+

tests/baselines/reference/reexportMissingDefault.types

@@ -0,0 +1,12 @@
+=== tests/cases/compiler/b.ts ===
+export const b = null;
+>b : any
+>null : null
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : any
+
+export { default } from "./b";
+>default : any
+

tests/baselines/reference/reexportMissingDefault1.errors.txt

@@ -0,0 +1,12 @@
+tests/cases/compiler/a.ts(2,10): error TS2305: Module '"./b"' has no exported member 'default'.
+
+
+==== tests/cases/compiler/b.ts (0 errors) ====
+    export const b = null;
+
+==== tests/cases/compiler/a.ts (1 errors) ====
+    export { b } from "./b";
+    export { default } from "./b";
+             ~~~~~~~
+!!! error TS2305: Module '"./b"' has no exported member 'default'.
+

tests/baselines/reference/reexportMissingDefault1.js

@@ -0,0 +1,21 @@
+//// [tests/cases/compiler/reexportMissingDefault1.ts] ////
+
+//// [b.ts]
+export const b = null;
+
+//// [a.ts]
+export { b } from "./b";
+export { default } from "./b";
+
+
+//// [b.js]
+"use strict";
+exports.__esModule = true;
+exports.b = null;
+//// [a.js]
+"use strict";
+exports.__esModule = true;
+var b_1 = require("./b");
+exports.b = b_1.b;
+var b_2 = require("./b");
+exports["default"] = b_2["default"];

tests/baselines/reference/reexportMissingDefault1.symbols

@@ -0,0 +1,11 @@
+=== tests/cases/compiler/b.ts ===
+export const b = null;
+>b : Symbol(b, Decl(b.ts, 0, 12))
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : Symbol(b, Decl(a.ts, 0, 8))
+
+export { default } from "./b";
+>default : Symbol(default, Decl(a.ts, 1, 8))
+

tests/baselines/reference/reexportMissingDefault1.types

@@ -0,0 +1,12 @@
+=== tests/cases/compiler/b.ts ===
+export const b = null;
+>b : any
+>null : null
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : any
+
+export { default } from "./b";
+>default : any
+

tests/baselines/reference/reexportMissingDefault2.errors.txt

@@ -0,0 +1,11 @@
+tests/cases/compiler/a.ts(2,10): error TS2305: Module '"./b"' has no exported member 'default'.
+
+
+==== tests/cases/compiler/b.ts (0 errors) ====
+    export const b = null;
+
+==== tests/cases/compiler/a.ts (1 errors) ====
+    export { b } from "./b";
+    export { default } from "./b";
+             ~~~~~~~
+!!! error TS2305: Module '"./b"' has no exported member 'default'.

tests/baselines/reference/reexportMissingDefault2.js

@@ -0,0 +1,20 @@
+//// [tests/cases/compiler/reexportMissingDefault2.ts] ////
+
+//// [b.ts]
+export const b = null;
+
+//// [a.ts]
+export { b } from "./b";
+export { default } from "./b";
+
+//// [b.js]
+"use strict";
+exports.__esModule = true;
+exports.b = null;
+//// [a.js]
+"use strict";
+exports.__esModule = true;
+var b_1 = require("./b");
+exports.b = b_1.b;
+var b_2 = require("./b");
+exports["default"] = b_2["default"];

tests/baselines/reference/reexportMissingDefault2.symbols

@@ -0,0 +1,11 @@
+=== tests/cases/compiler/b.ts ===
+export const b = null;
+>b : Symbol(b, Decl(b.ts, 0, 12))
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : Symbol(b, Decl(a.ts, 0, 8))
+
+export { default } from "./b";
+>default : Symbol(default, Decl(a.ts, 1, 8))
+

tests/baselines/reference/reexportMissingDefault2.types

@@ -0,0 +1,12 @@
+=== tests/cases/compiler/b.ts ===
+export const b = null;
+>b : any
+>null : null
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : any
+
+export { default } from "./b";
+>default : any
+

tests/baselines/reference/reexportMissingDefault3.errors.txt

@@ -0,0 +1,11 @@
+tests/cases/compiler/a.ts(2,10): error TS2305: Module '"./b"' has no exported member 'default'.
+
+
+==== tests/cases/compiler/b.ts (0 errors) ====
+    export const b = null;
+
+==== tests/cases/compiler/a.ts (1 errors) ====
+    export { b } from "./b";
+    export { default as a } from "./b";
+             ~~~~~~~
+!!! error TS2305: Module '"./b"' has no exported member 'default'.

tests/baselines/reference/reexportMissingDefault3.js

@@ -0,0 +1,20 @@
+//// [tests/cases/compiler/reexportMissingDefault3.ts] ////
+
+//// [b.ts]
+export const b = null;
+
+//// [a.ts]
+export { b } from "./b";
+export { default as a } from "./b";
+
+//// [b.js]
+"use strict";
+exports.__esModule = true;
+exports.b = null;
+//// [a.js]
+"use strict";
+exports.__esModule = true;
+var b_1 = require("./b");
+exports.b = b_1.b;
+var b_2 = require("./b");
+exports.a = b_2["default"];

tests/baselines/reference/reexportMissingDefault3.symbols

@@ -0,0 +1,11 @@
+=== tests/cases/compiler/b.ts ===
+export const b = null;
+>b : Symbol(b, Decl(b.ts, 0, 12))
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : Symbol(b, Decl(a.ts, 0, 8))
+
+export { default as a } from "./b";
+>a : Symbol(a, Decl(a.ts, 1, 8))
+

tests/baselines/reference/reexportMissingDefault3.types

@@ -0,0 +1,13 @@
+=== tests/cases/compiler/b.ts ===
+export const b = null;
+>b : any
+>null : null
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : any
+
+export { default as a } from "./b";
+>default : any
+>a : any
+

tests/baselines/reference/reexportMissingDefault4.errors.txt

@@ -0,0 +1,12 @@
+tests/cases/compiler/a.ts(2,10): error TS2305: Module '"./b"' has no exported member 'default'.
+
+
+==== tests/cases/compiler/b.d.ts (0 errors) ====
+    declare var b: number;
+    export { b };
+
+==== tests/cases/compiler/a.ts (1 errors) ====
+    export { b } from "./b";
+    export { default } from "./b";
+             ~~~~~~~
+!!! error TS2305: Module '"./b"' has no exported member 'default'.

tests/baselines/reference/reexportMissingDefault4.js

@@ -0,0 +1,17 @@
+//// [tests/cases/compiler/reexportMissingDefault4.ts] ////
+
+//// [b.d.ts]
+declare var b: number;
+export { b };
+
+//// [a.ts]
+export { b } from "./b";
+export { default } from "./b";
+
+//// [a.js]
+"use strict";
+exports.__esModule = true;
+var b_1 = require("./b");
+exports.b = b_1.b;
+var b_2 = require("./b");
+exports["default"] = b_2["default"];

tests/baselines/reference/reexportMissingDefault4.symbols

@@ -0,0 +1,14 @@
+=== tests/cases/compiler/b.d.ts ===
+declare var b: number;
+>b : Symbol(b, Decl(b.d.ts, 0, 11))
+
+export { b };
+>b : Symbol(b, Decl(b.d.ts, 1, 8))
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : Symbol(b, Decl(a.ts, 0, 8))
+
+export { default } from "./b";
+>default : Symbol(default, Decl(a.ts, 1, 8))
+

tests/baselines/reference/reexportMissingDefault4.types

@@ -0,0 +1,14 @@
+=== tests/cases/compiler/b.d.ts ===
+declare var b: number;
+>b : number
+
+export { b };
+>b : number
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : number
+
+export { default } from "./b";
+>default : any
+

tests/baselines/reference/reexportMissingDefault5.js

@@ -0,0 +1,29 @@
+//// [tests/cases/compiler/reexportMissingDefault5.ts] ////
+
+//// [b.d.ts]
+declare var b: number;
+export { b };
+
+//// [a.ts]
+export { b } from "./b";
+export { default as Foo } from "./b";
+
+//// [a.js]
+System.register(["./b"], function (exports_1, context_1) {
+    "use strict";
+    var __moduleName = context_1 && context_1.id;
+    return {
+        setters: [
+            function (b_1_1) {
+                exports_1({
+                    "b": b_1_1["b"]
+                });
+                exports_1({
+                    "Foo": b_1_1["default"]
+                });
+            }
+        ],
+        execute: function () {
+        }
+    };
+});

tests/baselines/reference/reexportMissingDefault5.symbols

@@ -0,0 +1,15 @@
+=== tests/cases/compiler/b.d.ts ===
+declare var b: number;
+>b : Symbol(b, Decl(b.d.ts, 0, 11))
+
+export { b };
+>b : Symbol(b, Decl(b.d.ts, 1, 8))
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : Symbol(b, Decl(a.ts, 0, 8))
+
+export { default as Foo } from "./b";
+>default : Symbol("tests/cases/compiler/b", Decl(b.d.ts, 0, 0))
+>Foo : Symbol(Foo, Decl(a.ts, 1, 8))
+

tests/baselines/reference/reexportMissingDefault5.types

@@ -0,0 +1,15 @@
+=== tests/cases/compiler/b.d.ts ===
+declare var b: number;
+>b : number
+
+export { b };
+>b : number
+
+=== tests/cases/compiler/a.ts ===
+export { b } from "./b";
+>b : number
+
+export { default as Foo } from "./b";
+>default : typeof import("tests/cases/compiler/b")
+>Foo : typeof import("tests/cases/compiler/b")
+

tests/baselines/reference/reexportMissingDefault6.errors.txt

@@ -0,0 +1,11 @@
+tests/cases/compiler/a.ts(2,10): error TS2305: Module '"./b"' has no exported member 'default'.
+
+
+==== tests/cases/compiler/b.ts (0 errors) ====
+    export const b = null;
+
+==== tests/cases/compiler/a.ts (1 errors) ====
+    export { b } from "./b";
+    export { default } from "./b";
+             ~~~~~~~
+!!! error TS2305: Module '"./b"' has no exported member 'default'.