Function IsExpressionOfOptionalChainRoot

internal/ast/utilities.go:383–385

Determines whether a node is the expression preceding an optional chain (i.e. `a` in `a?.b`).

(node *Node)

// Determines whether a node is the expression preceding an optional chain (i.e. `a` in `a?.b`).
func IsExpressionOfOptionalChainRoot(node *Node) bool {
	return IsOptionalChainRoot(node.Parent) && node.Parent.Expression() == node
}

func IsNullishCoalesce(node *Node) bool {
	return node.Kind == KindBinaryExpression && node.AsBinaryExpression().OperatorToken.Kind == KindQuestionQuestionToken