Replace unit test with checkJs test for ElementAccessExpression

Co-authored-by: DanielRosenwasser <[email protected]>

Author: Copilot

internal/ast/text_test.go

@@ -0,0 +1,26 @@
+// @ts-check
+// @checkJs: true
+
+// Create an object with properties
+const obj = { staticKey: "value", 0: "numeric" };
+
+// Use ElementAccessExpression with string literal (should work)
+const value1 = obj["staticKey"];
+
+// Use ElementAccessExpression with numeric literal (should work)
+const value2 = obj[0];
+
+// Use ElementAccessExpression with variable (would trigger the panic before fix)
+const dynamicKey = "dynamicKey";
+const value3 = obj[dynamicKey]; 
+
+// Nested ElementAccessExpression (common in webpack code)
+const nestedObj = { inner: { deep: "value" } };
+const innerKey = "inner";
+const deepKey = "deep";
+const nestedValue = nestedObj[innerKey][deepKey];
+
+// Create an array and access with ElementAccessExpression
+const arr = ["first", "second", "third"];
+const idx = 1;
+const arrValue = arr[idx];