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-extra-semi.js b/tools/node_modules/eslint/lib/rules/no-extra-semi.js
new file mode 100644
index 0000000000..acd312b32b
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules/no-extra-semi.js
@@ -0,0 +1,120 @@
+/**
+ * @fileoverview Rule to flag use of unnecessary semicolons
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const FixTracker = require("../util/fix-tracker");
+const astUtils = require("../ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow unnecessary semicolons",
+            category: "Possible Errors",
+            recommended: true
+        },
+
+        fixable: "code",
+        schema: []
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+
+        /**
+         * Reports an unnecessary semicolon error.
+         * @param {Node|Token} nodeOrToken - A node or a token to be reported.
+         * @returns {void}
+         */
+        function report(nodeOrToken) {
+            context.report({
+                node: nodeOrToken,
+                message: "Unnecessary semicolon.",
+                fix(fixer) {
+
+                    /*
+                     * Expand the replacement range to include the surrounding
+                     * tokens to avoid conflicting with semi.
+                     * https://github.com/eslint/eslint/issues/7928
+                     */
+                    return new FixTracker(fixer, context.getSourceCode())
+                        .retainSurroundingTokens(nodeOrToken)
+                        .remove(nodeOrToken);
+                }
+            });
+        }
+
+        /**
+         * Checks for a part of a class body.
+         * This checks tokens from a specified token to a next MethodDefinition or the end of class body.
+         *
+         * @param {Token} firstToken - The first token to check.
+         * @returns {void}
+         */
+        function checkForPartOfClassBody(firstToken) {
+            for (let token = firstToken;
+                token.type === "Punctuator" && !astUtils.isClosingBraceToken(token);
+                token = sourceCode.getTokenAfter(token)
+            ) {
+                if (astUtils.isSemicolonToken(token)) {
+                    report(token);
+                }
+            }
+        }
+
+        return {
+
+            /**
+             * Reports this empty statement, except if the parent node is a loop.
+             * @param {Node} node - A EmptyStatement node to be reported.
+             * @returns {void}
+             */
+            EmptyStatement(node) {
+                const parent = node.parent,
+                    allowedParentTypes = [
+                        "ForStatement",
+                        "ForInStatement",
+                        "ForOfStatement",
+                        "WhileStatement",
+                        "DoWhileStatement",
+                        "IfStatement",
+                        "LabeledStatement",
+                        "WithStatement"
+                    ];
+
+                if (allowedParentTypes.indexOf(parent.type) === -1) {
+                    report(node);
+                }
+            },
+
+            /**
+             * Checks tokens from the head of this class body to the first MethodDefinition or the end of this class body.
+             * @param {Node} node - A ClassBody node to check.
+             * @returns {void}
+             */
+            ClassBody(node) {
+                checkForPartOfClassBody(sourceCode.getFirstToken(node, 1)); // 0 is `{`.
+            },
+
+            /**
+             * Checks tokens from this MethodDefinition to the next MethodDefinition or the end of this class body.
+             * @param {Node} node - A MethodDefinition node of the start point.
+             * @returns {void}
+             */
+            MethodDefinition(node) {
+                checkForPartOfClassBody(sourceCode.getTokenAfter(node));
+            }
+        };
+
+    }
+};