1 files changed, 61 insertions, 0 deletions
diff --git a/vanilla/node_modules/estree-walker/src/walker.js b/vanilla/node_modules/estree-walker/src/walker.js
new file mode 100644
index 0000000..6dc6bd7
--- /dev/null
+++ b/vanilla/node_modules/estree-walker/src/walker.js
@@ -0,0 +1,61 @@
+/**
+ * @typedef { import('estree').Node} Node
+ * @typedef {{
+ *   skip: () => void;
+ *   remove: () => void;
+ *   replace: (node: Node) => void;
+ * }} WalkerContext
+ */
+
+export class WalkerBase {
+	constructor() {
+		/** @type {boolean} */
+		this.should_skip = false;
+
+		/** @type {boolean} */
+		this.should_remove = false;
+
+		/** @type {Node | null} */
+		this.replacement = null;
+
+		/** @type {WalkerContext} */
+		this.context = {
+			skip: () => (this.should_skip = true),
+			remove: () => (this.should_remove = true),
+			replace: (node) => (this.replacement = node)
+		};
+	}
+
+	/**
+	 * @template {Node} Parent
+	 * @param {Parent | null | undefined} parent
+	 * @param {keyof Parent | null | undefined} prop
+	 * @param {number | null | undefined} index
+	 * @param {Node} node
+	 */
+	replace(parent, prop, index, node) {
+		if (parent && prop) {
+			if (index != null) {
+				/** @type {Array<Node>} */ (parent[prop])[index] = node;
+			} else {
+				/** @type {Node} */ (parent[prop]) = node;
+			}
+		}
+	}
+
+	/**
+	 * @template {Node} Parent
+	 * @param {Parent | null | undefined} parent
+	 * @param {keyof Parent | null | undefined} prop
+	 * @param {number | null | undefined} index
+	 */
+	remove(parent, prop, index) {
+		if (parent && prop) {
+			if (index !== null && index !== undefined) {
+				/** @type {Array<Node>} */ (parent[prop]).splice(index, 1);
+			} else {
+				delete parent[prop];
+			}
+		}
+	}
+}