Function GetNodeAtPosition

internal/ast/utilities.go:2637–2663

Returns a token if position is in [start-of-leading-trivia, end), includes JSDoc only if requested

(file *SourceFile, position int, includeJSDoc bool)

// Returns a token if position is in [start-of-leading-trivia, end), includes JSDoc only if requested
func GetNodeAtPosition(file *SourceFile, position int, includeJSDoc bool) *Node {
	current := file.AsNode()
	for {
		var child *Node
		if includeJSDoc {
			for _, jsdoc := range current.JSDoc(file) {
				if nodeContainsPosition(jsdoc, position) {
					child = jsdoc
					break
				}
			}
		}
		if child == nil {
			current.ForEachChild(func(node *Node) bool {
				if nodeContainsPosition(node, position) {
					child = node
					return true
				}
				return false
			})
		}
		if child == nil || IsMetaProperty(child) {
			return current
		}
		current = child
	}
}

func nodeContainsPosition(node *Node, position int) bool {
	return node.Kind >= KindFirstNode && node.Pos() <= position && (position < node.End() || position == node.End() && node.Kind == KindEndOfFile)