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, 120 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/lib/rules/no-restricted-globals.js b/tools/node_modules/eslint/lib/rules/no-restricted-globals.js
new file mode 100644
index 0000000000..75428fc174
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules/no-restricted-globals.js
@@ -0,0 +1,120 @@
+/**
+ * @fileoverview Restrict usage of specified globals.
+ * @author Benoît Zugmeyer
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+const DEFAULT_MESSAGE_TEMPLATE = "Unexpected use of '{{name}}'.",
+    CUSTOM_MESSAGE_TEMPLATE = "Unexpected use of '{{name}}'. {{customMessage}}";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow specified global variables",
+            category: "Variables",
+            recommended: false
+        },
+
+        schema: {
+            type: "array",
+            items: {
+                oneOf: [
+                    {
+                        type: "string"
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            name: { type: "string" },
+                            message: { type: "string" }
+                        },
+                        required: ["name"],
+                        additionalProperties: false
+                    }
+                ]
+            },
+            uniqueItems: true,
+            minItems: 0
+        }
+    },
+
+    create(context) {
+
+        // If no globals are restricted, we don't need to do anything
+        if (context.options.length === 0) {
+            return {};
+        }
+
+        const restrictedGlobalMessages = context.options.reduce((memo, option) => {
+            if (typeof option === "string") {
+                memo[option] = null;
+            } else {
+                memo[option.name] = option.message;
+            }
+
+            return memo;
+        }, {});
+
+        /**
+         * Report a variable to be used as a restricted global.
+         * @param {Reference} reference the variable reference
+         * @returns {void}
+         * @private
+         */
+        function reportReference(reference) {
+            const name = reference.identifier.name,
+                customMessage = restrictedGlobalMessages[name],
+                message = customMessage
+                    ? CUSTOM_MESSAGE_TEMPLATE
+                    : DEFAULT_MESSAGE_TEMPLATE;
+
+            context.report({
+                node: reference.identifier,
+                message,
+                data: {
+                    name,
+                    customMessage
+                }
+            });
+        }
+
+        /**
+         * Check if the given name is a restricted global name.
+         * @param {string} name name of a variable
+         * @returns {boolean} whether the variable is a restricted global or not
+         * @private
+         */
+        function isRestricted(name) {
+            return restrictedGlobalMessages.hasOwnProperty(name);
+        }
+
+        return {
+            Program() {
+                const scope = context.getScope();
+
+                // Report variables declared elsewhere (ex: variables defined as "global" by eslint)
+                scope.variables.forEach(variable => {
+                    if (!variable.defs.length && isRestricted(variable.name)) {
+                        variable.references.forEach(reportReference);
+                    }
+                });
+
+                // Report variables not declared at all
+                scope.through.forEach(reference => {
+                    if (isRestricted(reference.identifier.name)) {
+                        reportReference(reference);
+                    }
+                });
+
+            }
+        };
+    }
+};