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/lib/token-store/filter-cursor.js b/tools/node_modules/eslint/lib/token-store/filter-cursor.js
new file mode 100644
index 0000000000..7133627bd3
--- /dev/null
+++ b/tools/node_modules/eslint/lib/token-store/filter-cursor.js
@@ -0,0 +1,43 @@
+/**
+ * @fileoverview Define the cursor which ignores specified tokens.
+ * @author Toru Nagashima
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const DecorativeCursor = require("./decorative-cursor");
+
+//------------------------------------------------------------------------------
+// Exports
+//------------------------------------------------------------------------------
+
+/**
+ * The decorative cursor which ignores specified tokens.
+ */
+module.exports = class FilterCursor extends DecorativeCursor {
+
+    /**
+     * Initializes this cursor.
+     * @param {Cursor} cursor - The cursor to be decorated.
+     * @param {Function} predicate - The predicate function to decide tokens this cursor iterates.
+     */
+    constructor(cursor, predicate) {
+        super(cursor);
+        this.predicate = predicate;
+    }
+
+    /** @inheritdoc */
+    moveNext() {
+        const predicate = this.predicate;
+
+        while (super.moveNext()) {
+            if (predicate(this.current)) {
+                return true;
+            }
+        }
+        return false;
+    }
+};