TypeScript: an exported variable of sibling namespaces can not be correctly transformed when assigned

[chirsz-ever]

Example input code:

namespace A {
    export var x = 0;
}

namespace A {
    console.log(x);
    x = 0;
}

TypeScript 6.0.2 (playground):

"use strict";
var A;
(function (A) {
    A.x = 0;
})(A || (A = {}));
(function (A) {
    console.log(A.x);
    A.x = 0;
})(A || (A = {}));

esbuild 0.28.0 (playground):

var A;
((A2) => {
  A2.x = 0;
})(A || (A = {}));
((A2) => {
  console.log(A2.x);
  x = 0;
})(A || (A = {}));

Related issue: #1410

[redwing509]

/attempt #4450

Implementation plan:

1. Analyze the existing codebase and understand the requirements
2. Implement the requested changes with clean, tested code
3. Add comprehensive tests covering the acceptance criteria
4. Submit PR with documentation updates if needed

Estimated delivery: within 24 hours.