Merge branch 'main' into fix31156

# Conflicts:
#	src/compiler/checker.ts

Author: ahejlsberg

CONTRIBUTING.md

@@ -148,6 +148,10 @@ The files in `lib/` are used to bootstrap compilation and usually **should not**
 
 The files `src/lib/dom.generated.d.ts` and `src/lib/webworker.generated.d.ts` both represent type declarations for the DOM and are auto-generated. To make any modifications to them, you will have to direct changes to https://github.com/Microsoft/TSJS-lib-generator
 
+## Documentation on TypeScript Compiler
+
+If you need a head start understanding how the compiler works, or how the code in different parts of the compiler works, there is a separate repo: [TypeScript Compiler Notes](https://github.com/microsoft/TypeScript-Compiler-Notes). As the name implies, it contains notes understood by different engineers about different parts of the compiler.
+
 ## Running the Tests
 
 To run all tests, invoke the `runtests-parallel` target using gulp:

package-lock.json

@@ -3509,21 +3509,22 @@ namespace ts {
 
     export function isExportsOrModuleExportsOrAlias(sourceFile: SourceFile, node: Expression): boolean {
         let i = 0;
-        const q = [node];
-        while (q.length && i < 100) {
+        const q = createQueue<Expression>();
+        q.enqueue(node);
+        while (!q.isEmpty() && i < 100) {
             i++;
-            node = q.shift()!;
+            node = q.dequeue();
             if (isExportsIdentifier(node) || isModuleExportsAccessExpression(node)) {
                 return true;
             }
             else if (isIdentifier(node)) {
                 const symbol = lookupSymbolForName(sourceFile, node.escapedText);
                 if (!!symbol && !!symbol.valueDeclaration && isVariableDeclaration(symbol.valueDeclaration) && !!symbol.valueDeclaration.initializer) {
                     const init = symbol.valueDeclaration.initializer;
-                    q.push(init);
+                    q.enqueue(init);
                     if (isAssignmentExpression(init, /*excludeCompoundAssignment*/ true)) {
-                        q.push(init.left);
-                        q.push(init.right);
+                        q.enqueue(init.left);
+                        q.enqueue(init.right);
                     }
                 }
             }