Fix literal subscript expressions in array patterns in TypeScript.

[bm-w]

The Tree-sitter TypeScript grammar “overloads” the subscript_expression syntax node with use in LHS assignment patterns. This causes duplicate node & attribute creation in the stanza dealing with array_pattern syntax nodes, giving an error — e.g.:

0: Error executing statement node @pat.comp_index at (4275, 3)
   src/stack-graphs.tsg:4275:3:
   4275 |   node @pat.comp_index
        |   ^
   in stanza
   src/stack-graphs.tsg:4272:1:
   4272 | (array_pattern
        | ^
   matching (array_pattern) node
   test/statements/array-pattern.ts:2:1:
   2 | [items[0], items[1]] = [items[1], items[0]];
     | ^
 > and executing statement node @subscript_expr.comp_index at (3602, 3)
   src/stack-graphs.tsg:3602:3:
   3602 |   node @subscript_expr.comp_index
        |   ^
   in stanza
   src/stack-graphs.tsg:3598:1:
   3598 | (subscript_expression
        | ^
   matching (subscript_expression) node
   test/statements/array-pattern.ts:2:2:
   2 | [items[0], items[1]] = [items[1], items[0]];
     |  ^
1: Duplicate variable [syntax node subscript_expression (2, 2)].comp_index

A somewhat inelegant fix is to check whether the array pattern component is a subscript_expression with a number and if so avoid creating the node & attribute within the array_pattern stanza. Copious testing (on this repo’s TypeScript test suite and on all of microsoft/vscode) reveals no negative side effects.

[Copilot]

Pull Request Overview

This PR addresses an error in TypeScript's literal subscript expressions when used in array patterns by modifying how the Tree-sitter TypeScript grammar handles subscript expressions.

• Fixes duplicate node and attribute creation for subscript expressions in array patterns.
• Adds a new test case in the TypeScript test suite to validate the fix.

Files not reviewed (1)

• languages/tree-sitter-stack-graphs-typescript/src/stack-graphs.tsg: Language not supported

Comments suppressed due to low confidence (1)

languages/tree-sitter-stack-graphs-typescript/test/statements/array-pattern.ts:1

• [nitpick] Consider adding additional test cases to cover more complex scenarios or edge cases for subscript expressions in array patterns.

const items = [13, 37];