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, 43 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/node_modules/fast-deep-equal/index.js b/tools/node_modules/eslint/node_modules/fast-deep-equal/index.js
new file mode 100644
index 0000000000..a29572d71d
--- /dev/null
+++ b/tools/node_modules/eslint/node_modules/fast-deep-equal/index.js
@@ -0,0 +1,43 @@
+'use strict';
+
+module.exports = function equal(a, b) {
+  if (a === b) return true;
+
+  var arrA = Array.isArray(a)
+    , arrB = Array.isArray(b)
+    , i;
+
+  if (arrA && arrB) {
+    if (a.length != b.length) return false;
+    for (i = 0; i < a.length; i++)
+      if (!equal(a[i], b[i])) return false;
+    return true;
+  }
+
+  if (arrA != arrB) return false;
+
+  if (a && b && typeof a === 'object' && typeof b === 'object') {
+    var keys = Object.keys(a);
+    if (keys.length !== Object.keys(b).length) return false;
+
+    var dateA = a instanceof Date
+      , dateB = b instanceof Date;
+    if (dateA && dateB) return a.getTime() == b.getTime();
+    if (dateA != dateB) return false;
+
+    var regexpA = a instanceof RegExp
+      , regexpB = b instanceof RegExp;
+    if (regexpA && regexpB) return a.toString() == b.toString();
+    if (regexpA != regexpB) return false;
+
+    for (i = 0; i < keys.length; i++)
+      if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
+
+    for (i = 0; i < keys.length; i++)
+      if(!equal(a[keys[i]], b[keys[i]])) return false;
+
+    return true;
+  }
+
+  return false;
+};