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, 96 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/lib/rules/max-params.js b/tools/node_modules/eslint/lib/rules/max-params.js
new file mode 100644
index 0000000000..85838adacc
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules/max-params.js
@@ -0,0 +1,96 @@
+/**
+ * @fileoverview Rule to flag when a function has too many parameters
+ * @author Ilya Volodin
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const lodash = require("lodash");
+
+const astUtils = require("../ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "enforce a maximum number of parameters in function definitions",
+            category: "Stylistic Issues",
+            recommended: false
+        },
+
+        schema: [
+            {
+                oneOf: [
+                    {
+                        type: "integer",
+                        minimum: 0
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            maximum: {
+                                type: "integer",
+                                minimum: 0
+                            },
+                            max: {
+                                type: "integer",
+                                minimum: 0
+                            }
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ]
+    },
+
+    create(context) {
+
+        const option = context.options[0];
+        let numParams = 3;
+
+        if (typeof option === "object" && option.hasOwnProperty("maximum") && typeof option.maximum === "number") {
+            numParams = option.maximum;
+        }
+        if (typeof option === "object" && option.hasOwnProperty("max") && typeof option.max === "number") {
+            numParams = option.max;
+        }
+        if (typeof option === "number") {
+            numParams = option;
+        }
+
+        /**
+         * Checks a function to see if it has too many parameters.
+         * @param {ASTNode} node The node to check.
+         * @returns {void}
+         * @private
+         */
+        function checkFunction(node) {
+            if (node.params.length > numParams) {
+                context.report({
+                    node,
+                    message: "{{name}} has too many parameters ({{count}}). Maximum allowed is {{max}}.",
+                    data: {
+                        name: lodash.upperFirst(astUtils.getFunctionNameWithKind(node)),
+                        count: node.params.length,
+                        max: numParams
+                    }
+                });
+            }
+        }
+
+        return {
+            FunctionDeclaration: checkFunction,
+            ArrowFunctionExpression: checkFunction,
+            FunctionExpression: checkFunction
+        };
+
+    }
+};