Guard type-as-namespace property diagnostics during checker initialization

Co-authored-by: RyanCavanaugh <6685088+RyanCavanaugh@users.noreply.github.com>

tsc/internal/checker/checker.go

@@ -1677,7 +1677,7 @@ func (c *Checker) checkAndReportErrorForUsingTypeAsNamespace(errorLocation *ast.
 		symbol := c.resolveSymbol(c.resolveName(errorLocation, name, ast.SymbolFlagsType&^ast.SymbolFlagsNamespace, nil /*nameNotFoundMessage*/, false /*isUse*/, false /*excludeGlobals*/))
 		if symbol != nil {
 			parent := errorLocation.Parent
-			if ast.IsQualifiedName(parent) {
+			if c.globalObjectType != nil && ast.IsQualifiedName(parent) {
 				debug.Assert(parent.AsQualifiedName().Left == errorLocation, "Should only be resolving left side of qualified name as a namespace")
 				propName := parent.AsQualifiedName().Right.Text()
 				propType := c.getPropertyOfType(c.getDeclaredTypeOfSymbol(symbol), propName)

tsc/testdata/baselines/reference/compiler/importEqualsTypeAsNamespaceNoLib.errors.txt

@@ -0,0 +1,29 @@
+error TS2318: Cannot find global type 'Array'.
+error TS2318: Cannot find global type 'Boolean'.
+error TS2318: Cannot find global type 'CallableFunction'.
+error TS2318: Cannot find global type 'Function'.
+error TS2318: Cannot find global type 'IArguments'.
+error TS2318: Cannot find global type 'NewableFunction'.
+error TS2318: Cannot find global type 'Number'.
+error TS2318: Cannot find global type 'Object'.
+error TS2318: Cannot find global type 'RegExp'.
+error TS2318: Cannot find global type 'String'.
+importEqualsTypeAsNamespaceNoLib.ts(2,12): error TS2702: 'C' only refers to a type, but is being used as a namespace here.
+
+
+!!! error TS2318: Cannot find global type 'Array'.
+!!! error TS2318: Cannot find global type 'Boolean'.
+!!! error TS2318: Cannot find global type 'CallableFunction'.
+!!! error TS2318: Cannot find global type 'Function'.
+!!! error TS2318: Cannot find global type 'IArguments'.
+!!! error TS2318: Cannot find global type 'NewableFunction'.
+!!! error TS2318: Cannot find global type 'Number'.
+!!! error TS2318: Cannot find global type 'Object'.
+!!! error TS2318: Cannot find global type 'RegExp'.
+!!! error TS2318: Cannot find global type 'String'.
+==== importEqualsTypeAsNamespaceNoLib.ts (1 errors) ====
+    interface C {}
+    import x = C.m;
+               ~
+!!! error TS2702: 'C' only refers to a type, but is being used as a namespace here.
+    

tsc/testdata/baselines/reference/compiler/importEqualsTypeAsNamespaceNoLib.js

@@ -0,0 +1,10 @@
+//// [tests/cases/compiler/importEqualsTypeAsNamespaceNoLib.ts] ////
+
+//// [importEqualsTypeAsNamespaceNoLib.ts]
+interface C {}
+import x = C.m;
+
+
+//// [importEqualsTypeAsNamespaceNoLib.js]
+"use strict";
+var x = C.m;

tsc/testdata/baselines/reference/compiler/importEqualsTypeAsNamespaceNoLib.symbols

@@ -0,0 +1,9 @@
+//// [tests/cases/compiler/importEqualsTypeAsNamespaceNoLib.ts] ////
+
+=== importEqualsTypeAsNamespaceNoLib.ts ===
+interface C {}
+>C : Symbol(C, Decl(importEqualsTypeAsNamespaceNoLib.ts, 0, 0))
+
+import x = C.m;
+>x : Symbol(x, Decl(importEqualsTypeAsNamespaceNoLib.ts, 0, 14))
+

tsc/testdata/baselines/reference/compiler/importEqualsTypeAsNamespaceNoLib.types

@@ -0,0 +1,9 @@
+//// [tests/cases/compiler/importEqualsTypeAsNamespaceNoLib.ts] ////
+
+=== importEqualsTypeAsNamespaceNoLib.ts ===
+interface C {}
+import x = C.m;
+>x : any
+>C : any
+>m : any
+