diff --git a/src/ast/traverse.ts b/src/ast/traverse.ts
index e939507..4b83395 100644
--- a/src/ast/traverse.ts
+++ b/src/ast/traverse.ts
@@ -32,12 +32,11 @@ export const KEYS = Evk.unionWith({
/**
* Check that the given key should be traversed or not.
- * @this {Traversable}
* @param key The key to check.
+ * @param value The value of the key in the node.
* @returns `true` if the key should be traversed.
*/
-function fallbackKeysFilter(this: any, key: string): boolean {
- let value = null
+function fallbackKeysFilter(key: string, value: any = null): boolean {
return (
key !== "comments" &&
key !== "leadingComments" &&
@@ -46,7 +45,7 @@ function fallbackKeysFilter(this: any, key: string): boolean {
key !== "range" &&
key !== "tokens" &&
key !== "trailingComments" &&
- (value = this[key]) !== null &&
+ value !== null &&
typeof value === "object" &&
(typeof value.type === "string" || Array.isArray(value))
)
@@ -57,8 +56,10 @@ function fallbackKeysFilter(this: any, key: string): boolean {
* @param node The node to get.
* @returns The keys to traverse.
*/
-function getFallbackKeys(node: Node): string[] {
- return Object.keys(node).filter(fallbackKeysFilter, node)
+export function getFallbackKeys(node: Node): string[] {
+ return Object.keys(node).filter((key) =>
+ fallbackKeysFilter(key, node[key as keyof Node]),
+ )
}
/**
@@ -119,5 +120,3 @@ export interface Visitor {
export function traverseNodes(node: Node, visitor: Visitor): void {
traverse(node, null, visitor)
}
-
-export { getFallbackKeys }
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