`using` keyword is not recognized

[guillaumebrunerie]

The following piece of code is valid but it is parsed incorrectly:

{
  using resource = getResource();
}

Here's a link to the TypeScript Playground showing that the snippet above is valid JavaScript or TypeScript:

https://www.typescriptlang.org/play/?filetype=js#code/N4AjCgzBXBnBLAdgcxAJwKawPbTQYwxAF4RkMAXAJS1wIwAoBKAbnAF8g

The output of tree-sitter parse is the following:

(program [0, 0] - [3, 0]
  (statement_block [0, 0] - [2, 1]
    (ERROR [1, 1] - [1, 6]
      (identifier [1, 1] - [1, 6]))
    (expression_statement [1, 7] - [1, 32]
      (assignment_expression [1, 7] - [1, 31]
        left: (identifier [1, 7] - [1, 15])
        right: (call_expression [1, 18] - [1, 31]
          function: (identifier [1, 18] - [1, 29])
          arguments: (arguments [1, 29] - [1, 31]))))))

Support for the using keyword was added to tree-sitter-typescript in tree-sitter/tree-sitter-typescript#262, but it’s a JavaScript feature, not something TypeScript-specific, so I think it should have been added here directly instead.

ECMAScript proposal: https://github.com/tc39/proposal-explicit-resource-management

It is currently stage 3, so native support in web browsers is quite limited for now, but it is coming in Chrome 134 for instance (https://chromestatus.com/feature/5071680358842368).