`firstChild` missing

[joelburget]

In my parsed expression, SyntaxNode.firstChild is missing. I compared to both Tree.children and TreeCursor.firstChild().

My grammar is here: https://github.com/joelburget/lvca-web/blob/master/grammar/flowchart.grammar

Interaction showing inconsistency:

❯ node
Welcome to Node.js v17.5.0.
Type ".help" for more information.
> let flowchart = await import("./grammar/flowchart.mjs");
undefined
> let exprParser = flowchart.parser.configure({ top: "topExpr" })
{ topRules: { Program: [ 0, 2 ], topExpr: [ 1, 31 ] } }
undefined
> function parseExpr(str) { return exprParser.parse(str); }
undefined
> let node = parseExpr("hd '(a b)")
undefined
> node.children.length
1
> let cursor = node.cursor()
undefined
> cursor.firstChild()
true
> [cursor.name, cursor.from, cursor.to]
[ 'Expr', 0, 9 ]
> node.firstChild
undefined

[marijnh]

node is of type Tree, which has no firstChild property. You want node.topNode.firstChild.