Function flattenChain

internal/transformers/estransforms/optionalchain.go:135–144

(chain *ast.Node)

}

func flattenChain(chain *ast.Node) flattenResult {
	debug.Assert(!isNonNullChain(chain))
	links := []*ast.Node{chain}
	for !ast.IsTaggedTemplateExpression(chain) && chain.QuestionDotToken() == nil {
		chain = ast.SkipPartiallyEmittedExpressions(chain.Expression())
		debug.Assert(!isNonNullChain(chain))
		links = append([]*ast.Node{chain}, links...)
	}
	return flattenResult{chain.Expression(), links}
}

func isCallChain(node *ast.Node) bool {
	return ast.IsCallExpression(node) && node.Flags&ast.NodeFlagsOptionalChain != 0