Function findIssuesInTree

src/tools/ast/syntax-check.ts:65–90

(root: TSNodeLike, content: string)

/** Pure: walk a (mock or real) tree and collect ERROR / MISSING nodes. */
export function findIssuesInTree(root: TSNodeLike, content: string): SyntaxIssue[] {
  const lines = content.split('\n');
  const issues: SyntaxIssue[] = [];
  const visit = (node: TSNodeLike): void => {
    if (issues.length >= MAX_REPORTED_ISSUES) return;
    // Prune: only descend where an error lives (real tree-sitter sets hasError
    // on every ancestor of an ERROR/MISSING node). Mocks may omit it → descend.
    if (node.hasError !== undefined && !boolProp(node.hasError, node)) return;
    const missing = boolProp(node.isMissing, node);
    if (node.type === 'ERROR' || missing) {
      const line = node.startPosition.row + 1;
      issues.push({
        line,
        excerpt: (lines[node.startPosition.row] ?? '').trim().slice(0, 120),
        kind: missing ? 'missing' : 'error',
      });
      if (node.type === 'ERROR') return; // children of an ERROR node are noise
    }
    for (let i = 0; i < node.childCount; i++) {
      const c = node.child(i);
      if (c) visit(c);
    }
  };
  visit(root);
  return issues;
}

/** Pure: JSON validation with a line number extracted from the parse error. */
export function checkJsonSyntax(content: string): SyntaxIssue[] {