Do not consider UMD alias symbols as visible within external modules (#18049)

* Do not consider UMD alias symbols as visible within external modules in the symbol writer

* Minimal repro

Author: weswigham

src/compiler/checker.ts

@@ -2095,6 +2095,10 @@ namespace ts {
                     canQualifySymbol(symbolFromSymbolTable, meaning);
             }
 
+            function isUMDExportSymbol(symbol: Symbol) {
+                return symbol && symbol.declarations && symbol.declarations[0] && isNamespaceExportDeclaration(symbol.declarations[0]);
+            }
+
             function trySymbolTable(symbols: SymbolTable) {
                 // If symbol is directly available by its name in the symbol table
                 if (isAccessible(symbols.get(symbol.escapedName))) {
@@ -2106,6 +2110,7 @@ namespace ts {
                     if (symbolFromSymbolTable.flags & SymbolFlags.Alias
                         && symbolFromSymbolTable.escapedName !== "export="
                         && !getDeclarationOfKind(symbolFromSymbolTable, SyntaxKind.ExportSpecifier)
+                        && !(isUMDExportSymbol(symbolFromSymbolTable) && isExternalModule(getSourceFileOfNode(enclosingDeclaration)))
                         // If `!useOnlyExternalAliasing`, we can use any type of alias to get the name
                         && (!useOnlyExternalAliasing || some(symbolFromSymbolTable.declarations, isExternalModuleImportEqualsDeclaration))) {
 

tests/baselines/reference/exportAsNamespace.d.types

@@ -5,5 +5,5 @@ export var X;
 >X : any
 
 export as namespace N
->N : typeof N
+>N : typeof "tests/cases/compiler/exportAsNamespace"
 

tests/baselines/reference/importShouldNotBeElidedInDeclarationEmit.js

@@ -0,0 +1,26 @@
+//// [tests/cases/compiler/importShouldNotBeElidedInDeclarationEmit.ts] ////
+
+//// [umd.d.ts]
+export as namespace UMD;
+
+export type Thing = {
+    a: number;
+}
+
+export declare function makeThing(): Thing;
+//// [index.ts]
+import { makeThing } from "umd";
+export const thing = makeThing();
+
+
+//// [index.js]
+"use strict";
+exports.__esModule = true;
+var umd_1 = require("umd");
+exports.thing = umd_1.makeThing();
+
+
+//// [index.d.ts]
+export declare const thing: {
+    a: number;
+};

tests/baselines/reference/importShouldNotBeElidedInDeclarationEmit.symbols

@@ -0,0 +1,23 @@
+=== tests/cases/compiler/node_modules/umd.d.ts ===
+export as namespace UMD;
+>UMD : Symbol(UMD, Decl(umd.d.ts, 0, 0))
+
+export type Thing = {
+>Thing : Symbol(Thing, Decl(umd.d.ts, 0, 24))
+
+    a: number;
+>a : Symbol(a, Decl(umd.d.ts, 2, 21))
+}
+
+export declare function makeThing(): Thing;
+>makeThing : Symbol(makeThing, Decl(umd.d.ts, 4, 1))
+>Thing : Symbol(Thing, Decl(umd.d.ts, 0, 24))
+
+=== tests/cases/compiler/index.ts ===
+import { makeThing } from "umd";
+>makeThing : Symbol(makeThing, Decl(index.ts, 0, 8))
+
+export const thing = makeThing();
+>thing : Symbol(thing, Decl(index.ts, 1, 12))
+>makeThing : Symbol(makeThing, Decl(index.ts, 0, 8))
+

tests/baselines/reference/importShouldNotBeElidedInDeclarationEmit.types

@@ -0,0 +1,24 @@
+=== tests/cases/compiler/node_modules/umd.d.ts ===
+export as namespace UMD;
+>UMD : typeof "tests/cases/compiler/node_modules/umd"
+
+export type Thing = {
+>Thing : Thing
+
+    a: number;
+>a : number
+}
+
+export declare function makeThing(): Thing;
+>makeThing : () => Thing
+>Thing : Thing
+
+=== tests/cases/compiler/index.ts ===
+import { makeThing } from "umd";
+>makeThing : () => { a: number; }
+
+export const thing = makeThing();
+>thing : { a: number; }
+>makeThing() : { a: number; }
+>makeThing : () => { a: number; }
+

tests/baselines/reference/umd-augmentation-1.types

@@ -47,7 +47,7 @@ var t = p.x;
 
 === tests/cases/conformance/externalModules/node_modules/math2d/index.d.ts ===
 export as namespace Math2d;
->Math2d : typeof Math2d
+>Math2d : typeof "tests/cases/conformance/externalModules/node_modules/math2d/index"
 
 export interface Point {
 >Point : Point

tests/baselines/reference/umd-augmentation-2.types

@@ -45,7 +45,7 @@ var t = p.x;
 
 === tests/cases/conformance/externalModules/node_modules/math2d/index.d.ts ===
 export as namespace Math2d;
->Math2d : typeof Math2d
+>Math2d : typeof "tests/cases/conformance/externalModules/node_modules/math2d/index"
 
 export interface Point {
 >Point : Point

tests/baselines/reference/umd-augmentation-3.symbols

@@ -44,7 +44,7 @@ export = M2D;
 >M2D : Symbol(M2D, Decl(index.d.ts, 2, 13))
 
 declare namespace M2D {
->M2D : Symbol(Math2d, Decl(index.d.ts, 2, 13), Decl(math2d-augment.d.ts, 0, 33))
+>M2D : Symbol(M2D, Decl(index.d.ts, 2, 13), Decl(math2d-augment.d.ts, 0, 33))
 
 	interface Point {
 >Point : Symbol(Point, Decl(index.d.ts, 4, 23))

tests/baselines/reference/umd-augmentation-3.types

@@ -47,13 +47,13 @@ var t = p.x;
 
 === tests/cases/conformance/externalModules/node_modules/math2d/index.d.ts ===
 export as namespace Math2d;
->Math2d : typeof Math2d
+>Math2d : typeof M2D
 
 export = M2D;
 >M2D : typeof M2D
 
 declare namespace M2D {
->M2D : typeof Math2d
+>M2D : typeof M2D
 
 	interface Point {
 >Point : Point

tests/baselines/reference/umd-augmentation-4.symbols

@@ -42,7 +42,7 @@ export = M2D;
 >M2D : Symbol(M2D, Decl(index.d.ts, 2, 13))
 
 declare namespace M2D {
->M2D : Symbol(Math2d, Decl(index.d.ts, 2, 13), Decl(math2d-augment.d.ts, 0, 33))
+>M2D : Symbol(M2D, Decl(index.d.ts, 2, 13), Decl(math2d-augment.d.ts, 0, 33))
 
 	interface Point {
 >Point : Symbol(Point, Decl(index.d.ts, 4, 23))