❗unqualified identifier for delete

🚧 under construction -> configurable

JS ⟩ value ⟩ object ⟩ property ⟩ access ⟩ delete ⟩ unqualified identifier

only object's configurable properties are "qualified" for "delete", other identifiers are "unqualified" ( can't delete them❗). 📘 MDN

👥 相關

• ⛔delete of an unqualified identifier in strict mode❗️

• ⚖️undeclared identifier

💈範例

• 👉 related：class body has its own "this" context

typeof undeclared === "undefined"     // true

📘 手冊

• SyntaxError: applying the 'delete' operator to an unqualified name is deprecated ⭐️

🚧

• configurable