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, 78 insertions, 0 deletions

diff --git a/tools/node_modules/eslint/lib/rules/no-empty.js b/tools/node_modules/eslint/lib/rules/no-empty.js
new file mode 100644
index 0000000000..b71b8582a3
--- /dev/null
+++ b/tools/node_modules/eslint/lib/rules/no-empty.js
@@ -0,0 +1,78 @@
+/**
+ * @fileoverview Rule to flag use of an empty block statement
+ * @author Nicholas C. Zakas
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("../ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow empty block statements",
+            category: "Possible Errors",
+            recommended: true
+        },
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    allowEmptyCatch: {
+                        type: "boolean"
+                    }
+                },
+                additionalProperties: false
+            }
+        ]
+    },
+
+    create(context) {
+        const options = context.options[0] || {},
+            allowEmptyCatch = options.allowEmptyCatch || false;
+
+        const sourceCode = context.getSourceCode();
+
+        return {
+            BlockStatement(node) {
+
+                // if the body is not empty, we can just return immediately
+                if (node.body.length !== 0) {
+                    return;
+                }
+
+                // a function is generally allowed to be empty
+                if (astUtils.isFunction(node.parent)) {
+                    return;
+                }
+
+                if (allowEmptyCatch && node.parent.type === "CatchClause") {
+                    return;
+                }
+
+                // any other block is only allowed to be empty, if it contains a comment
+                if (sourceCode.getCommentsInside(node).length > 0) {
+                    return;
+                }
+
+                context.report({ node, message: "Empty block statement." });
+            },
+
+            SwitchStatement(node) {
+
+                if (typeof node.cases === "undefined" || node.cases.length === 0) {
+                    context.report({ node, message: "Empty switch statement." });
+                }
+            }
+        };
+
+    }
+};