tools: move eslint from tools to tools/node_modules

This is required because we need to add the babel-eslint dependency
and it has to be able to resolve "eslint".
babel-eslint is required to support future ES features such as async
iterators and import.meta.

Refs: https://github.com/nodejs/node/pull/17755
PR-URL: https://github.com/nodejs/node/pull/17820
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

1 files changed, 55 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/node_modules/unist-util-visit/index.js b/tools/node_modules/eslint/node_modules/unist-util-visit/index.js
new file mode 100644
index 0000000000..d51a97513b
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/unist-util-visit/index.js
@@ -0,0 +1,55 @@
+'use strict';
+
+/* Expose. */
+module.exports = visit;
+
+var is = require('unist-util-is');
+
+/* Visit. */
+function visit(tree, test, visitor, reverse) {
+  if (typeof test === 'function' && typeof visitor !== 'function') {
+    reverse = visitor;
+    visitor = test;
+    test = null;
+  }
+
+  one(tree);
+
+  /* Visit a single node. */
+  function one(node, index, parent) {
+    var result;
+
+    index = index || (parent ? 0 : null);
+
+    if (!test || node.type === test || is(test, node, index, parent || null)) {
+      result = visitor(node, index, parent || null);
+    }
+
+    if (node.children && result !== false) {
+      return all(node.children, node);
+    }
+
+    return result;
+  }
+
+  /* Visit children in `parent`. */
+  function all(children, parent) {
+    var step = reverse ? -1 : 1;
+    var max = children.length;
+    var min = -1;
+    var index = (reverse ? max : min) + step;
+    var child;
+
+    while (index > min && index < max) {
+      child = children[index];
+
+      if (child && one(child, index, parent) === false) {
+        return false;
+      }
+
+      index += step;
+    }
+
+    return true;
+  }
+}