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, 49 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/lib/rules/no-path-concat.js b/tools/node_modules/eslint/lib/rules/no-path-concat.js
new file mode 100644
index 0000000000..1e153a43b6
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules/no-path-concat.js
@@ -0,0 +1,49 @@
+/**
+ * @fileoverview Disallow string concatenation when using __dirname and __filename
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow string concatenation with `__dirname` and `__filename`",
+            category: "Node.js and CommonJS",
+            recommended: false
+        },
+
+        schema: []
+    },
+
+    create(context) {
+
+        const MATCHER = /^__(?:dir|file)name$/;
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+
+            BinaryExpression(node) {
+
+                const left = node.left,
+                    right = node.right;
+
+                if (node.operator === "+" &&
+                        ((left.type === "Identifier" && MATCHER.test(left.name)) ||
+                        (right.type === "Identifier" && MATCHER.test(right.name)))
+                ) {
+
+                    context.report({ node, message: "Use path.join() or path.resolve() instead of + to create paths." });
+                }
+            }
+
+        };
+
+    }
+};