Method tryReparseOptionalChain

internal/parser/parser.go:5419–5439

(node *ast.Expression)

}

func (p *Parser) tryReparseOptionalChain(node *ast.Expression) bool {
	if node.Flags&ast.NodeFlagsOptionalChain != 0 {
		return true
	}
	// check for an optional chain in a non-null expression
	if ast.IsNonNullExpression(node) {
		expr := node.Expression()
		for ast.IsNonNullExpression(expr) && expr.Flags&ast.NodeFlagsOptionalChain == 0 {
			expr = expr.Expression()
		}
		if expr.Flags&ast.NodeFlagsOptionalChain != 0 {
			// this is part of an optional chain. Walk down from `node` to `expression` and set the flag.
			for ast.IsNonNullExpression(node) {
				node.Flags |= ast.NodeFlagsOptionalChain
				node = node.Expression()
			}
			return true
		}
	}
	return false
}

func (p *Parser) parseElementAccessExpressionRest(pos int, expression *ast.Expression, questionDotToken *ast.Node) *ast.Node {
	var argumentExpression *ast.Expression